The Chemistry Of Fluorinated High Spin Iron Complexes

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The Chemistry of Fluorinated High Spin Iron Complexes

Author : Anser S. Qazi
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis The Chemistry of Fluorinated High Spin Iron Complexes by : Anser S. Qazi

Download or read book The Chemistry of Fluorinated High Spin Iron Complexes written by Anser S. Qazi and published by . This book was released on 2019 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the most essential processes for sustaining the world's population is nitrogen fixation, the conversion of atmospheric nitrogen (N2) into ammonia (NH3), the major component of fertilizer. The industrial Haber-Bosch process for N2 fixation requires extreme temperatures and pressures, and consequentially consumes much of the world's energy. In contrast, bacteria containing the nitrogenase enzyme fix N2 under ambient conditions despite the robust N2 triple bond. A popular approach towards studying the complex mechanism of nitrogenase is to synthesize model complexes of its active site, the iron-molybdenum co-factor (FeMoco). Most model complexes to date are low-spin and thus poorly resemble FeMoco's high-spin environment. The first high-spin iron (I) terminal N2 adduct was recently synthesized by the Harman Lab using an adamantyl-substituted trispyrazolylborate (Tp) ligand. However, its electron-rich nature renders it incapable of forming N-H bonds. We propose the synthesis of a more electron-deficient, fluorinated Tp ligand, Tp(3,5-(CF3)2Ph, CF3 (hydrotris-3-(3,5-bis(trifluoromethyl)Phenyl)-5-(trifluoromethyl)borate). When bound to iron, this should facilitate the reduction at less negative potentials and the functionalization of N2. Synthesis of (3,5-bis(trifluoromethyl)phenyl) methyl ketone has been completed. Claisen condensation with trifluoroethylacetate, followed by condensation with hydrazine to form the pyrazole ring is underway. Combing the pyrazole with sodium borohydride will generate the Na Tp(3,5-(CF3)2Ph, CF3. Subsequent metalation with iron(II) chloride under an inert atmosphere should generate the corresponding iron compound. Compounds will be characterized by a variety of methods including 1H & 19F-NMR, EPR, IR, Raman, X-ray crystallography, and cyclic voltammetry.

The Curious World of Fluorinated Molecules

Author : Konrad Seppelt
Publisher : Elsevier
ISBN 13 : 0128198753
Total Pages : 456 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis The Curious World of Fluorinated Molecules by : Konrad Seppelt

Download or read book The Curious World of Fluorinated Molecules written by Konrad Seppelt and published by Elsevier. This book was released on 2020-10-30 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Curious World of Fluorinated Molecules: Molecules Containing Fluorine is the sixth volume in the Progress in Fluorine Science series and is edited by the world-renowned scientist Konrad Seppelt. Dr. Seppelt brings together a team of global experts to uncover the multifaceted nature of the most electronegative element in the Periodic Table. The book explores the fascinating world of unpredictable, fluorine-containing molecules through their discoveries, path to recognition, current state of the art, and impact on the broader fields of fluorinated materials development. This volume will inspire and energize researchers, future scientists, and educators working in fluorine chemistry. Highlights the current state of fundamental research of fluorinated molecules that either helped to rewrite the fundamental rules of chemistry or impacted modern material technologies Features contributions from a global team of leading experts in the field Provides a unique combination of the historical and current examples that explain the unique role that fluorine can play in advancing our understanding of the scientific method at large

The Chemistry of Fluorinated 1,3,5-Triazapentadienyl Coinage Metal Complexes

Author : Jaime Antonio Flores
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (796 download)

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Book Synopsis The Chemistry of Fluorinated 1,3,5-Triazapentadienyl Coinage Metal Complexes by : Jaime Antonio Flores

Download or read book The Chemistry of Fluorinated 1,3,5-Triazapentadienyl Coinage Metal Complexes written by Jaime Antonio Flores and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Our interest in fluorinated triazapentadienyl ligands is due to the relevant results observed over the past years in catalysis by fluorous biphase chemistry, the increased stability of metal adducts supported by fluorinated ligands, and the utility of monoanionic, nitrogen-based ligands such as ß-diketiminates (or 1,5-diazapentadienyls) and tris(pyrazolyl)borates in the synthesis and catalytic application of the corresponding metal complexes. Fluorinated 1,3,5-triazapentadienyls, a relatively new class of monoanionic, bidentate, nitrogen-based ligands in coordination chemistry, were successfully obtained starting with a modified method for the synthesis of fluorinated triazapentadienes. This modified method is cheaper than the classical method and provides a route to obtaining highly fluorinated triazapentadienes in good yields. Deprotonation of these triazapentadienes yielded the triazapentadienyl ligands. Fluorinated triazapentadienyl ligands were highly effective in the isolation and full characterization of a variety of copper(I), silver(I) and gold(I) adducts which show quite interesting bonding and structural features as well as some useful catalytic properties. Structural and spectroscopic data of triazapentadienyl-copper(I)-carbonyl and -ethylene complexes revealed that fluorinated triazapentadienyl ligands are weak ơ-donors. For example, in infrared spectroscopy the u(CO) signals of triazapentadienyl-copper(I)-carbonyl adducts are close to the corresponding signal of free CO, and appear at higher values than the copper(I)-ß-diketiminate analogs. This suggests that triazapentadienyl ligands generate a more acidic metal center with poor M - CO ıpiı-back-donation. Similarly, the 1H NMR signals of triazapentadienyl-copper(I)-ethylene compounds show upfield shifted values for the bonded ethylene moieties in comparison with a ß-diketiminate-copper(I) analog. Moreover, copper(I)-ethylene and -acetonitrile adducts supported by triazapentadienyl ligands effectively catalyzed carbene and nitrene transfer reactions to a variety of substrates in high efficiencies. X-ray diffraction analyses of triazapentadienyl-silver(I) complexes showed that in the solid state fluorinated triazapentadienyl ligands can bind to silver(I) in up to three different modes of coordination. For example, triazapentadienyl ligands can be K2-donors via terminal nitrogen atoms or K1-donors via either a central or one terminal nitrogen atom. In addition, the ligands can adopt U- or W-shaped backbones. 19F NMR spectroscopy data offer a way to assign the structural configuration of the metal-triazapentadienyl interaction and to predict the conformation of the fluorinated ligand backbone. Gold(I) adducts were isolated for the first time with ß-diketiminate ligands. These remarkably air and light stable compounds are dinuclear species and feature 12-membered metallacycles in the solid state. In addition, fluorinated triazapentadienyl-gold(I)-ethylene adducts were isolated as air and light stable monomers in the solid state. 1H and 13C NMR analyses show that there is a higher degree of ıpiı-back-donation in gold(I)-ethylene complexes in comparison with the copper(I)-ethylene analogs. Gold(I)-ethylene adducts supported by fluorinated triazapentadienyl ligands also mediate carbene transfer reactions from ethyl diazoacetate to saturated and unsaturated hydrocarbons.

The Chemistry of Imaging Probes

Author : Lorenzo Tei
Publisher : Frontiers Media SA
ISBN 13 : 288945598X
Total Pages : 129 pages
Book Rating : 4.8/5 (894 download)

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Book Synopsis The Chemistry of Imaging Probes by : Lorenzo Tei

Download or read book The Chemistry of Imaging Probes written by Lorenzo Tei and published by Frontiers Media SA. This book was released on 2018-10-19 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decades, the field of molecular imaging has been rapidly growing involving multiple disciplines such as medicine, biology, chemistry, pharmacology and biomedical engineering. Any molecular imaging procedure requires an imaging probe that is an agent used to visualize, characterize and quantify biological processes in living systems. Such a probe typically consists of an agent that usually produces signal for imaging purpose, a targeting moiety, and a linker connecting the targeting moiety and the signaling agent. Many challenging problems of molecular imaging can be addressed by exploiting the great possibilities offered by modern synthetic organic and coordination chemistry and the powerful procedures provided by conjugation chemistry. Thus, chemistry plays a decisive role in the development of this cutting-edge methodology. Currently, the diagnostic imaging modalities include Magnetic Resonance Imaging (MRI), Computed Tomography (CT), Ultrasound (US), Nuclear Imaging (PET, SPECT), Optical Imaging (OI) and Photoacoustic Imaging (PAI). Each of these imaging modalities has its own advantages and disadvantages, and therefore, a multimodal approach combining two techniques is often adopted to generate complementary anatomical and functional information of the disease. The basis for designing imaging probes for a given application is dictated by the chosen imaging modality, which in turn is dependent upon the concentration and localization profile (vascular, extracellular matrix, cell membrane, intracellular, near or at the cell nucleus) of the target molecule. The development of high-affinity ligands and their conjugation to the targeting vector is also one of the key steps for pursuing efficient molecular imaging probes. Other excellent reviews, text and monographs describe the principles of biomedical imaging, focusing on molecular biology or on the physics behind the techniques. This Research Topic aims to show how chemistry can offer molecular imaging the opportunity to express all its potential.

The Chemistry of Iron, Cobalt and Nickel

Author : D. Nicholls
Publisher : Elsevier
ISBN 13 : 148314643X
Total Pages : 201 pages
Book Rating : 4.4/5 (831 download)

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Book Synopsis The Chemistry of Iron, Cobalt and Nickel by : D. Nicholls

Download or read book The Chemistry of Iron, Cobalt and Nickel written by D. Nicholls and published by Elsevier. This book was released on 2013-10-02 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Chemistry of Iron, Cobalt and Nickel deals with the chemistry of iron, cobalt, and nickel and covers topics ranging from the occurrence and distribution of all three elements to their properties, allotropy, and analytical chemistry. Compounds of iron, cobalt, and nickel in both low and high oxidation states are also discussed. This book is divided into three sections and begins with the history of iron, along with its occurrence and distribution, allotropy, and preparation and industrial production. The nuclear, physical, and chemical properties of iron, as well as the biological importance of iron compounds, are also considered. Compounds of iron are discussed, including carbonyls and nitric oxide complexes. The next two sections deal with the history, occurrence and distribution, allotropy, analytical chemistry, and preparation and industrial production of cobalt and nickel, along with their nuclear, physical, and chemical properties. Compounds of cobalt and nickel are examined, from carbonyls and nitrosyls to cyanides and organometallic compounds. This monograph will be a useful resource for inorganic chemists.

Modern Synthesis Processes and Reactivity of Fluorinated Compounds

Author : Henri Groult
Publisher : Elsevier
ISBN 13 : 0128037903
Total Pages : 792 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Modern Synthesis Processes and Reactivity of Fluorinated Compounds by : Henri Groult

Download or read book Modern Synthesis Processes and Reactivity of Fluorinated Compounds written by Henri Groult and published by Elsevier. This book was released on 2016-11-04 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Synthesis Processes and Reactivity of Fluorinated Compounds focuses on the exceptional character of fluorine and fluorinated compounds. This comprehensive work explores examples taken from all classes of fluorine chemistry and illustrates the extreme reactivity of fluorinating media and the peculiar synthesis routes to fluorinated materials. The book provides advanced and updated information on the latest synthesis routes to fluorocompounds and the involved reaction mechanisms. Special attention is given to the unique reactivity of fluorine and fluorinated media, along with the correlation of those properties to valuable applications of fluorinated compounds. Contains quality content edited, and contributed, by leading scholars in the field Presents applied guidance on the preparation of original fluorinated compounds, potentially transferable from the lab scale to industrial applications Provides practical synthesis information for a wide audience interested in fluorine compounds in many branches of chemistry, materials science, and physics

Energy Research Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 1740 pages
Book Rating : 4.U/5 (183 download)

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Book Synopsis Energy Research Abstracts by :

Download or read book Energy Research Abstracts written by and published by . This book was released on 1981 with total page 1740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Chemistry of Transition Metal Fluoride Complexes

Author : Ruqia Nazir
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (817 download)

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Book Synopsis Chemistry of Transition Metal Fluoride Complexes by : Ruqia Nazir

Download or read book Chemistry of Transition Metal Fluoride Complexes written by Ruqia Nazir and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal fluoride complexes that are extremely sensitive to air and water have been characterized by liquid injection field desorption/ionization (LIFDI) mass spectrometry. Dilute solutions of fluoride complexes of nickel, rhodium, titanium, zirconium, hafnium and ruthenium in toluene and tetrahydrofuran were examined by LIFDI methods on a time-of-flight mass spectrometer. All the spectra of nickel, titanium zirconium and hafnium complexes exhibited the molecular ion as base peak. The ruthenium and rhodium complexes showed loss of HF from the molecular ion as base peaks but the molecular ions were easily detected. Two new nickel fluoride complexes are formed by C-F activation reactions with 2,3,5,6-tetrafluoro-4-dimethylaminopyridine and 2,3,5,6-tetrafluoro-4-methoxypyridine yielding 3,5,6-trifluoro-4-dimethylaminopyridine nickel fluoride and 3,5,6-trifluoro-4-methoxypyridine nickel fluoride, respectively. The crystal structure of 3,5,6-trifluoro-4-dimethylaminopyridine nickel fluoride shows typical square planar coordination at nickel with an Ni-F distance of 1.8521(9) Å. pentamethylcyclopentadienyl metal difluoride (metal = Ti, Zr, Hf) complexes were synthesized from the reaction corresponding metal dichloride with NaF. N,N-dimethylethylene-1,2-diamine metal difluoride complexes (metal = Zn, Co, Ni) were synthesized from the reaction of metal difluoride with N,N-dimethylethylene-1,2-diamine. Ruthenium difluoride complexes were prepared from the reaction of ruthenium bis bifluoride complexes with TMAF. The compounds were characterized by multinuclear NMR spectroscopy and LIFDI mass spectrometry. The nickel monofluoride complexes do not provide useful mass spectra by EI or ESI methods. Only the difluoride complexes of titanium, zirconium, hafnium, ruthenium, zinc, cobalt and nickel species showed evidence of the fluoride ligands in the ESI spectra. Collision induced dissociation (CID) was used to investigate the fragmentation pattern of the ions formed in the ESI mass spectrum. It was observed that the ligand attached to the metal has an effect on the fragmentation pattern of complex and the presence of phosphine strengthens the metal fluoride bond. A modified quadrupole mass spectrometer was used to carry out gas phase ion molecule (I-M) reaction of metal ions with liquid and gaseous neutral molecule. Transition metal fluoride complexes did not show evidence of I-M reactions while Re and Mn tricarbonyl complexes have shown 100% conversion to the product. The decay pathway of multiply charged anions (MCAs) of Ti and Zr was also investigated and it was found that these ions decay through ionic fragmentation rather than electron detachment. Hydrogen bonding of pentamethyl cyclopentadienyl difluoride complexes of Ti and Zr with indole and 1,1,1,3,3,3 hexafluoroisopropanol was studied using fluorine NMR spectroscopy. Change in entropy and change in enthalpy were calculated from the equilibrium constant values (K) using Van't Hoff's equation.

Organometallic Chemistry

Author : E W Abel
Publisher : Royal Society of Chemistry
ISBN 13 : 184755413X
Total Pages : 490 pages
Book Rating : 4.8/5 (475 download)

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Book Synopsis Organometallic Chemistry by : E W Abel

Download or read book Organometallic Chemistry written by E W Abel and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organometallic chemistry is an interdisciplinary science which continues to grow at a rapid pace. Although there is continued interest in synthetic and structural studies the last decade has seen a growing interest in the potential of organometallic chemistry to provide answers to problems in catalysis synthetic organic chemistry and also in the development of new materials. This Specialist Periodical Report aims to reflect these current interests reviewing progress in theoretical organometallic chemistry, main group chemistry, the lanthanides and all aspects of transition metal chemistry. Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 80 years the Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.

Photonic and Electronic Properties of Fluoride Materials

Author : Alain Tressaud
Publisher : Elsevier
ISBN 13 : 0128017953
Total Pages : 532 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Photonic and Electronic Properties of Fluoride Materials by : Alain Tressaud

Download or read book Photonic and Electronic Properties of Fluoride Materials written by Alain Tressaud and published by Elsevier. This book was released on 2016-03-15 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photonic and Electronic Properties of Fluoride Materials: Progress in Fluorine Science, the first volume in this new Elsevier series, provides an overview of the important optical, magnetic, and non-linear properties of fluoride materials. Beginning with a brief review of relevant synthesis methods from single crystals to nanopowders, this volume offers valuable insight for inorganic chemistry and materials science researchers. Edited and written by leaders in the field, this book explores the practical aspects of working with these materials, presenting a large number of examples from inorganic fluorides in which the type of bonding occurring between fluorine and transition metals (either d- or 4f-series) give rise to peculiar properties in many fundamental and applicative domains. This one-of-a-kind resource also includes several chapters covering functional organic fluorides used in nano-electronics, in particular in liquid crystal devices, in organic light-emitting diodes, or in organic dyes for sensitized solar cells. The book describes major advances and breakthroughs achieved by the use of fluoride materials in important domains such as superconductivity, luminescence, laser properties, multiferroism, transport properties, and more recently, in fluoro-perovskite for dye-sensitized solar cells and inorganic fluoride materials for NLO, and supports future development in these varied and key areas. The book is edited by Alain Tressaud, past chair and founder of the CNRS French Fluorine Network. Each book in the collection includes the work of highly-respected volume editors and contributors from both academia and industry to bring valuable and varied content to this active field. Provides unique coverage of the physical properties of fluoride materials for chemists and material scientists Begins with a brief review of relevant synthesis methods from single crystals to nanopowders Includes valuable information about functional organic fluorides used in nano-electronics, in particular in liquid crystal devices, in organic light-emitting diodes, or in organic dyes for sensitized solar cells

High- and Low-Valent tris-N-Heterocyclic Carbene Iron Complexes

Author : Carola S. Vogel
Publisher : Springer Science & Business Media
ISBN 13 : 3642272541
Total Pages : 145 pages
Book Rating : 4.6/5 (422 download)

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Book Synopsis High- and Low-Valent tris-N-Heterocyclic Carbene Iron Complexes by : Carola S. Vogel

Download or read book High- and Low-Valent tris-N-Heterocyclic Carbene Iron Complexes written by Carola S. Vogel and published by Springer Science & Business Media. This book was released on 2012-02-03 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carola Vogel’s PhD thesis focuses on the synthesis, and structural and spectroscopic characterization of the first high valent iron nitride complexes. In her interdisciplinary and collaborative research Carola also describes the reactivity studies of a unique iron (V) nitride complex with water. These studies show that quantitative yields of ammonia are given at ambient conditions. High valent iron nitride and oxo species have been proposed as key intermediates in many bio-catalytic transformations, but until now these species have proven exceedingly challenging to isolate and study. Iron complexes in high oxidation states can thus serve as models for iron-containing enzymes to help us understand biological systems or aid our development of more efficient industrial catalysts.

Organic and Inorganic Fluorine Chemistry

Author : Axel Haupt
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110659506
Total Pages : 846 pages
Book Rating : 4.1/5 (16 download)

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Book Synopsis Organic and Inorganic Fluorine Chemistry by : Axel Haupt

Download or read book Organic and Inorganic Fluorine Chemistry written by Axel Haupt and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-03-22 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic and Inorganic Fluorine Chemistry provides an introduction to fluorine chemistry and an overview of the most important fluorinated compounds and general preparation techniques. The book is divided into three parts, covering general aspects, inorganic fluorides and fluoroorganic compounds. The inorganic part presents the most important element fluorides and oxyfluorides, their preparation as well as their most characteristic properties. The organic section focuses on the different types of fluorination and the corresponding reagents. The application of these techniques is discussed for many different types of substrates. The book addresses advanced students in chemistry as well as researchers in academia and industry. The readers will benefit from a large number of original references which give access to further information. In addition, study questions at the end of each chapter will help to repeat and internalise the most important aspects.

Fluorine in Heterocyclic Chemistry Volume 1

Author : Valentine Nenajdenko
Publisher : Springer
ISBN 13 : 3319043463
Total Pages : 683 pages
Book Rating : 4.3/5 (19 download)

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Book Synopsis Fluorine in Heterocyclic Chemistry Volume 1 by : Valentine Nenajdenko

Download or read book Fluorine in Heterocyclic Chemistry Volume 1 written by Valentine Nenajdenko and published by Springer. This book was released on 2014-06-30 with total page 683 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume work combines comprehensive information on the chemistry of the fluorinated heterocycles. The material has been divided such that the first volume is dedicated to 5-membered fluorinated heterocycles and macrocycles, while the second volume combines data connected with the chemistry of fluorine containing 6-membered heterocycles. Both volumes will be of interest to synthetic organic chemists in general, and particularly for those colleagues working in the fields of heterocyclic-compound chemistry, materials chemistry, medicinal chemistry, and fluorine chemistry. All information is presented and classified clearly to be effective source for broad auditory of chemists. It will be interesting for scientists working in the field of inorganic and coordination chemistry. Fluorinated heterocycles are becoming increasingly important in many areas including the pharmaceutical industry, materials science and agriculture. The presence of fluorine can result in substantial functional changes in the biological as well as physicochemical properties of organic compounds. Incorporation of fluorine into drug molecules can greatly affect their physicochemical properties, such as bond strength, lipophilicity, bioavailability, conformation, electrostatic potential, dipole moment, pKa etc. as well as pharmacokinetic properties, such as tissue distribution, rate of metabolism and pharmacological properties, such as pharmacodynamics and toxicology.

Studies of Iron Polyfluorometallacycle Complexes Enroute to the "green" Catalytic Synthesis of Hydrofluorocarbons

Download Studies of Iron Polyfluorometallacycle Complexes Enroute to the

Author : Stephanie L. Granville
Publisher :
ISBN 13 :
Total Pages : 264 pages
Book Rating : 4.:/5 (871 download)

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Book Synopsis Studies of Iron Polyfluorometallacycle Complexes Enroute to the "green" Catalytic Synthesis of Hydrofluorocarbons by : Stephanie L. Granville

Download or read book Studies of Iron Polyfluorometallacycle Complexes Enroute to the "green" Catalytic Synthesis of Hydrofluorocarbons written by Stephanie L. Granville and published by . This book was released on 2010 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Porphyrin Handbook, Volume 5

Author : Karl Kadish
Publisher : Academic Press
ISBN 13 : 9780123932051
Total Pages : 392 pages
Book Rating : 4.9/5 (32 download)

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Book Synopsis The Porphyrin Handbook, Volume 5 by : Karl Kadish

Download or read book The Porphyrin Handbook, Volume 5 written by Karl Kadish and published by Academic Press. This book was released on 1999-10-15 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists in such fields as mathematics, physics, chemistry, biochemistry, biology, and medicine are currently involved in investigations of porphyrins and their numerous analogues and derivatives. Porphyrins are being used as platforms for the study of theoretical principles, as catalysts, as drugs, as electronic devices, and as spectroscopic probes in biology and medicine. The need for an up-to-date and authoritative treatise on the porphyrin system has met with universal acclaim amongst scientists and investigators.

Fluorocarbene, Fluoroalkyl, and Fluoride Complexes of First-Row Transition Metals

Author : Graham Mark Lee
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)

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Book Synopsis Fluorocarbene, Fluoroalkyl, and Fluoride Complexes of First-Row Transition Metals by : Graham Mark Lee

Download or read book Fluorocarbene, Fluoroalkyl, and Fluoride Complexes of First-Row Transition Metals written by Graham Mark Lee and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorinated organic compounds play important roles in our society, as these products range from life-saving pharmaceuticals and agrochemicals, to fluoropolymers with extremely high thermal and chemical stability. Although elemental fluorine (F2) is the most reactive element, some fluoro-organic compounds are chemically inert. As such, controlled reactivity of fluorine or highly-fluorinated organic fragments is a considerable, yet important challenge for synthetic chemists. Fluoro-organometallic chemistry has been studied for decades, as researchers attempt to maximize the potential of metal mediated/catalyzed processes for the synthesis of fluorinated organic molecules. Within this framework, metal fluorocarbene complexes are particularly interesting because of their highly tunable reactivity, and are proposed for use in important metathesis/polymerization reactions of perfluorinated alkenes. While considerable work is still needed to make these proposed reactions a reality, this thesis outlines contributions from our research group. We showed that cobalt fluorocarbene complexes CpCo(=CFRF)(PPh2Me) (RF = F, CF3) undergo [2+2] cycloaddition reactions with tetrafluoroethylene (TFE) and phenylacetylene to form perfluorometallacyclobutane and partially fluorinated metallacyclobutene products, respectively. For both reactions, computational studies reveal a stepwise ring-closing mechanism, which proceeds through a singlet 1,4-diradical intermediate. Next, the formation of CpCo(=CF2)(L) complexes is achieved via the direct addition of difluorocarbene, generated in situ, to a cobalt(I) precursor. Subsequent addition of CF2 to cobalt fluorocarbene complexes results in [2+1] cycloaddition and formation of perfluorinated alkene complexes. The [2+1] addition is highly favored as the cobalt fluorocarbenes readily react with electrophilic CF2. A series of experiments provide evidence for the stepwise nature of fluoroalkene complex formation. From Co(I) fluorocarbene complexes, the focus shifts to preparing metal fluorocarbenes with electrophilic-type reactivity. The synthesis of bis(perfluoroalkyl) complexes serve as precursors for preparation of perfluoroalkyl cobalt(III) fluorocarbenes, which undergo migratory insertion reactions of the fluorocarbene into the perfluoroalkyl ligand. Using a similar synthetic approach, nickel(II) and palladium(II) difluorocarbene complexes are prepared from their corresponding trifluoromethyl precursors. The synthesis, characterization and reactivity of cobalt(III) fluoride complexes is also described, including the catalytic fluorination of acyl chlorides, demonstrating the first example of a cobalt(III) catalyzed fluorination reaction. The effects of the various ancillary ligands on these cobalt catalysts are investigated using high-throughput experimentation technology, and the scope of the reaction is expanded to include the synthesis of a variety of acyl fluoride compounds. Finally, the results and learnings from this work will be summarized and highlighted. The future directions and novel research which could result from the continuation of these projects is discussed, with an emphasis placed on the areas believed to have the highest potential impact.

STUDY OF METAL FLUORINE COMPLEXES.

Author : Ronald O. Ragsdale
Publisher :
ISBN 13 :
Total Pages : 147 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis STUDY OF METAL FLUORINE COMPLEXES. by : Ronald O. Ragsdale

Download or read book STUDY OF METAL FLUORINE COMPLEXES. written by Ronald O. Ragsdale and published by . This book was released on 1969 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: A self-consistent set of sigma constants was developed to obtain linear free energy relations with titanium tetrafluoride complexes of the aromatic amine oxides. Several series of the diadducts of titanium tetrafluoride were studied with high-resolution fluorine-19 nuclear magnetic resonance spectroscopy. These series consisted of fluorotitanate complexes of formula TiF4.2(donor) and TiF5.(donor)( - ), where donor represents an organic molecule (Lewis base) which coordinates through oxygen. The TiF4.2(donor) adducts included both TiF4.2D complexes in which the donors are identical, and TiF4.D, D' complexes, in which D and D' represent different Lewis bases. Cis-trans isomerism of the diadducts of TiF4 was also studied. Some complexes of TiF4 with substituted pyridines were also investigated. Fluorine-19 chemical shifts and spin-spin coupling constants were determined for most of the fluorotitanate complexes. The temperature dependence of the TiF4.2D spectra was also studied. The low infrared spectra of some SnF4.2D and TiF4.2D were also obtained. (Author).