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Author : Hua Han
Publisher :
ISBN 13 :
Total Pages : 522 pages
Book Rating : 4.:/5 (18 download)
Download or read book Ligand Designs for Polynuclear and Heterometallic Complexes written by Hua Han and published by . This book was released on 2007 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Luis Raúl Castañeda-Perea
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (129 download)
Download or read book Imidoyl Amidine Ligands written by Luis Raúl Castañeda-Perea and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ligand design in general enables the formation of coordination compounds with multiple functionalities within a single framework. To date, two of the most widely studied ligands are 2,2':6',2''-terpyridine (terpy) and acetylacetone (acac), whose tridentate and bidentate coordination pockets, respectively, enables the formation of metallic complexes with various geometries. The Brusso group had been incorporating imidoyl amidine (ImAm) ligands to build different materials such as organic radicals and fluorescent materials. In particular, the ligands N-2-pyridylimidoyl-2-pyridylamidine (Py2ImAm) and N-2-pyrimidylimidoyl-2-pyrimidylamidine (Pm2ImAm) were recently synthesized and have great appeal to build metallic complexes, as they poses two coordination sites similar to those in terpy and acac. The work presented herein represents the first studies involving the coordination of Py2ImAm and Pm2ImAm as discrete ligands. Our results demonstrate the versatility of these ligand frameworks, in which discrete mononuclear complexes, homometallic and heterometallic polynuclear complexes may be realized. Chapter one serves as a brief introduction to transition metal chemistry and has a comprehensive review of the coordination chemistry of the ImAm ligand framework. In chapter two, the selective coordination of first row transition metals into the bidentate or tridentate sites of Py2ImAm is explored. The formation of these mononuclear complexes is acid-base driven, where a weak acid induces coordination to the tridentate site and a weak base leads to coordination in the bidentate site. Coordination to both sides of Pm2ImAm with manganese or iron is explored in chapter three. The results show the formation of unusual tetranuclear complexes with the metal ions in both low spin and high spin configurations. Chapter four covers the coordination to cobalt, and the formation of polynuclear complexes with different geometries using Pm2ImAm. The magnetochemistry of these cobalt polynuclear complexes is also presented and reveal a single molecule magnet behaviour for one of the complexes. Finally, in chapter five, a one-pot synthesis of copper-manganese heterometallic complexes is presented. Overall, these imidoyl amidine ligands are able to build complexes with different geometries, different electronic configurations (i.e. low or high spin), and different metal ions. These results show a great versatility of ImAm ligands and suggest the future use of these ligands by other research groups.
Author : Gamer Christoph
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)
Download or read book Ligand Design for Heterometallic 3d Metallacrown Complexes written by Gamer Christoph and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mark Stradiotto
Publisher : John Wiley & Sons
ISBN 13 : 1118839811
Total Pages : 448 pages
Book Rating : 4.1/5 (188 download)
Download or read book Ligand Design in Metal Chemistry written by Mark Stradiotto and published by John Wiley & Sons. This book was released on 2016-09-01 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of ancillary ligands used to modify the structural and reactivity properties of metal complexes has evolved into a rapidly expanding sub-discipline in inorganic and organometallic chemistry. Ancillary ligand design has figured directly in the discovery of new bonding motifs and stoichiometric reactivity, as well as in the development of new catalytic protocols that have had widespread positive impact on chemical synthesis on benchtop and industrial scales. Ligand Design in Metal Chemistry presents a collection of cutting-edge contributions from leaders in the field of ligand design, encompassing a broad spectrum of ancillary ligand classes and reactivity applications. Topics covered include: Key concepts in ligand design Redox non-innocent ligands Ligands for selective alkene metathesis Ligands in cross-coupling Ligand design in polymerization Ligand design in modern lanthanide chemistry Cooperative metal-ligand reactivity P,N Ligands for enantioselective hydrogenation Spiro-cyclic ligands in asymmetric catalysis This book will be a valuable reference for academic researchers and industry practitioners working in the field of ligand design, as well as those who work in the many areas in which the impact of ancillary ligand design has proven significant, for example synthetic organic chemistry, catalysis, medicinal chemistry, polymer science and materials chemistry.
Author : Christoph Gamer
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)
Download or read book Ligand Design for Heterometallic 3d Metallacrown Complexes written by Christoph Gamer and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two decades of research on single molecule magnets (SMMs) led to multiple concepts to reach one of the most ambitious goals in molecular magnetism, a high energy barrier (Ueff ) for the magnetization reversal of a single molecule. This energy barrier is dependent on the spin ground state (S) and the axial magnetoanisotropy (D) of the molecule. Previous research projects led to complexes with remarkably high S or D values but only few combining both. Up to now, a systematical manipulation and control of S and D on a molecular scope has not been accomplished yet. Herein, a systematic approach to obtain a high spin ground state accompanied with high molecular magnetic anisotropy is presented using the versatile compound class of metallacrowns (MCs). The magnetic director approach has proven to effectively yield 12-MC-4 structures with high spin ground states. In addition, the planar crown scaffold represents an ideal framework to align the Jahn-Teller axes of ring forming metal ions with high single ion anisotropy. Prerequisites for an effective use of both concepts are the ability of the central guest ion to take part in strong magnetic exchange coupling and a tuneable anisotropic electron distribution of the ring forming metal ions. Hence, 3d transition metal ions express themselves as the optimal choice. Systematic synthesis of heterometallic MCs requires varying selectivity of the central and the ring coordination pockets. To fulfill this condition, two distinct ligand optimizations were followed in this work. The donor atoms on apical coordination sites of the crown metal ions were varied yielding to a different binding affinity according to Pearson's HSAB concept. Moreover, additional coordinating functionalities were introduced in established MC ligand systems, like amidoximes, in order to adjust the whole coordination environment of the crown forming metal ions. According to these approaches, several new 3d MC compounds were synthesized and analyzed using infrared spectroscopy, single crystal X-ray diffraction and SQUID magnetometry. Synthesis and the use of 2-methylmercaptobenzohydroxamic acid led to the isolation of the very first cadmium(II) metallacrown opening new perspectives for an improvement of the luminescence properties of this compound class. To highlight some of the results, a mixed valent cobalt(II/III) MC, double decker and a discrete Cu(II) MC and even two manganese double decker MCs are reported in this work.
Author :
Publisher :
ISBN 13 :
Total Pages : 314 pages
Book Rating : 4.:/5 (94 download)
Download or read book Heterometallic Complexes with Lactams and Related Ligands written by and published by . This book was released on 1991 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : B.I. Kharisov
Publisher : Elsevier
ISBN 13 : 0128110627
Total Pages : 470 pages
Book Rating : 4.1/5 (281 download)
Download or read book Direct Synthesis of Metal Complexes written by B.I. Kharisov and published by Elsevier. This book was released on 2018-04-19 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct Synthesis of Metal Complexes provides in-depth coverage of the direct synthesis of coordination and organometallic compounds. The work is primarily organized by methods, but also covers highly relevant complexes, such as metal-polymer coordination compounds. This updated reference discusses recent developments in cryosynthesis, electrosynthesis, and tribosynthesis (popular as it doesn't require organic solvents), with special attention paid to 'greener' methodologies and approaches. Additionally, the book describes physical methods of zero-valent metal interaction with organic matter, including sputtering, ultrasonic treatment and synthesis in ionic liquids. The book presents completely new content as a follow-up to the 1999 Elsevier Science publication Direct Synthesis of Coordination and Organometallic Compounds that was edited by Dr. Garnovskii and Dr. Kharisov. - Covers current methods and techniques of metal interactions with organic media leading to metal chelates, adducts, di- and polymetallic complexes, metal-containing macrocycles, supported coordination compounds (i.e., metal complexes on carbon nanotubes), and more - Describes reactivities of distinct forms of elemental metals (powders, sheets, nanoparticles (including a host of less-common metal nanostructures) with organic phase (liquid, solid and gaseous) and water - Includes experimental procedures, with examples of direct synthesis, at the end of each chapter
Author : Shinichi Kawaguchi
Publisher : Springer Science & Business Media
ISBN 13 : 3642501486
Total Pages : 129 pages
Book Rating : 4.6/5 (425 download)
Download or read book Variety in Coordination Modes of Ligands in Metal Complexes written by Shinichi Kawaguchi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal complexes play important roles as catalysts or other participants in synthetic and biological reactions. Substrates and sometimes attacking reagents also are activated through coordination with metal atoms or ions. In these events the natures not only of the central metals but also of ancillary ligands exert important influences on the stability and reactivity of the coordinated substrates. A ligand in general can adopt various coordination modes depending on its chemical environment, thus functioning as a probe. The number of coordination modes increases with increasing complexity of the ligand. In this book it is shown that even the simplest mono- and diatomic ligands such as H, CO, and N2 exhibit a variety of coordination modes, which are related to their reactions. The thiocyanate anion is taken up as a representative of the triatomic ambidentate ligands, and factors influencing the preferences for N- und S-bonding are summarized. Coordination chemistry of ß-dicarbonyl compounds is a highlight of this book. Acetylacetone, one of the most familiar Werner ligands, is shown to favor -carbon and n-allylic bonding in many instances. Its versatile behaviour in changing coordination modes is revealed.
Author : Nico Matteo Bonanno
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)
Download or read book Design of Redox-active Ligands written by Nico Matteo Bonanno and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the design, synthesis, properties, and coordination chemistry of redoxactive ligands. This thesis also explores new ways of expanding our ligand systems, in order to improve their binding capacities. We accomplished this by utilizing familiar redox-active moieties and structures to those published previously in our group, but with enhanced topological capacities and predictable structural outcomes. Chapter 1 begins with a general outline of the fundamental principles that govern organic radicals including; their reactivity, their properties and applications, and how these can be applied to the design of ligands for polynuclear assembly. Chapter 2 starts with a brief overview of arylazo ligands and the synthesis of a new hydrazone substituted phenalenol ligand (2.1). In the following section (2.2) we use this ligand to produce homoleptic ligand mixed-valence complexes featuring trivalent cobalt and iron metals. The chapter is concluded (2.3) with the synthesis of a new ditopic aryl-azo ligand and its cobalt coordination chemistry involving a neutral tetra-radical/tetra-nuclear molecular grid featuring valence tautomerism. Chapter 3 begins with the design and synthesis of a new ditopic diamino phenol ligand, which was found to oxidize to a neutral stable phenoxyl radical (3.1-3.2). The solution properties, which include reversible pi-dimerization of this stable radical are also described (3.3), and later the substitution chemistry of this new ligand is explored (3.4). In chapter 4, we describe the coordination chemistry of this new ditopic aminophenol ligand, which includes assembly into several coordination clusters involving copper (4.2), iron (4.3), nickel (4.4), and zinc (4.5). These coordination clusters feature the ligand in a variety of oxidation states; including rare examples of dianion "aminyl" radical clusters. In chapter 5, we begin with a description of a new synthetic derivative which can be used for the construction of larger tetratopic or asymmetric diamino phenol ligands. In 5.2 we describe the synthesis of a tetratopic aminophenol ligand along with its reactivity and aerial oxidation to a tri-phenoxyl radical. In 5.3, we conclude the thesis with the use of an asymmetric diamino phenol ligand and it's Cu(II/III) coordination chemistry, which displayed unique reactivity with molecular oxygen.
Author : Malgorzata Holynska
Publisher : John Wiley & Sons
ISBN 13 : 3527343210
Total Pages : 448 pages
Book Rating : 4.5/5 (273 download)
Download or read book Single-Molecule Magnets written by Malgorzata Holynska and published by John Wiley & Sons. This book was released on 2019-02-11 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concise overview of synthesis and characterization of single molecule magnets Molecular magnetism is explored as an alternative to conventional solid-state magnetism as the basis for ultrahigh-density memory materials with extremely fast processing speeds. In particular single-molecule magnets (SMM) are in the focus of current research, both because of their intrinsic magnetization properties, as well as because of their potential use in molecular spintronic devices. SMMs are fascinating objects on the example of which one can explain many concepts. Single-Molecule Magnets: Molecular Architectures and Building Blocks for Spintronics starts with a general introduction to single-molecule magnets (SMM), which helps readers to understand the evolution of the field and its future. The following chapters deal with the current synthetic methods leading to SMMs, their magnetic properties and their characterization by methods such as high-field electron paramagnetic resonance, paramagnetic nuclear magnetic resonance, and magnetic circular dichroism. The book closes with an overview of radical-bridged SMMs, which have shown application potential as building blocks for high-density memories. Covers a hot topic – single-molecule magnetism is one of the fastest growing research fields in inorganic chemistry and materials science Provides researchers and newcomers to the field with a solid foundation for their further work Single-Molecule Magnets: Molecular Architectures and Building Blocks for Spintronics will appeal to inorganic chemists, materials scientists, molecular physicists, and electronics engineers interested in the rapidly growing field of study.
Author : N. Russo
Publisher : Springer Science & Business Media
ISBN 13 : 9781402014956
Total Pages : 620 pages
Book Rating : 4.0/5 (149 download)
Download or read book Metal-ligand Interactions written by N. Russo and published by Springer Science & Business Media. This book was released on 2003-12-31 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the NATO Advanced Study Institute, held in Cetraro, Italy, from 1 to 12 September 2002
Author : Chandraleka Saravanan
Publisher : BoD – Books on Demand
ISBN 13 : 1789231825
Total Pages : 122 pages
Book Rating : 4.7/5 (892 download)
Download or read book Ligand written by Chandraleka Saravanan and published by BoD – Books on Demand. This book was released on 2018-05-23 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book Ligand describes the diversity and versatility of ligands, covering structural features, donor-acceptor properties and secondary functions like molecular recognition. Moreover, this book also provides a comprehensive account on the applicability like catalysis, sensors, supramolecular assembly, photochemical property, bioinorganic chemistry, and so on. The advancement of fundamentals in ligand design and the control of physicochemical properties of coordination compounds has largely increased emphasis on understanding the structural and electronic features toward different perspectives in materials science. In this regard, this book has a special appeal to chemists, biologists and others. This book will be beneficial for the graduate students, teachers, researchers and other professionals who are interested to fortify and expand their knowledge in chemistry, biology, microbiology, biotechnology, materials science, environmental science and so on.
Author : Zeeshan Majeed
Publisher : Cuvillier Verlag
ISBN 13 : 3736943520
Total Pages : 226 pages
Book Rating : 4.7/5 (369 download)
Download or read book Employing Crystal Engineering Principles to Fabricate Zero to Three-Dimensional 4f-based Metal Aggregates using O-Donor Ligands written by Zeeshan Majeed and published by Cuvillier Verlag. This book was released on 2013-02-08 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in lanthanide (Ln) coordination chemistry has increased significantly over the past few years, in particular as a result of their intriguing spectral and magnetic properties. LnIII ions are “hard acids” and generally prefer to coordinate with “hard bases” such as O- and F-donor ligands. Their coordination geometries are usually determined by ligand steric factors rather than crystal field effects. The research described in this dissertation mainly focuses on the interaction of LnIII ions with O-donor ligands such as carboxylates and polyols, while aiming to synthesize Ln-based polynuclear coordination compounds having interesting magnetic properties. Moreover, investigation of the influence of ligand back-bone on the magneto-structural properties of the resulting compounds was explored. Consequently some novel and efficient one-pot synthetic methodologies have been successfully developed to prepare Ln-based polynuclear clusters as well as networks of various dimensionalities, displaying exciting magnetic properties. Also correlations between structural parameters and magnetic properties have been established. The resulting compounds were characterized in detail using analytical methods like FT-IR, elemental analysis, single crystal XRD, powder XRD, and magnetic SQUID measurements. The first approach, based upon a systematic study of Ln-carboxylate chemistry, has led to the isolation of two 1D chains possessing single chain magnet (SCM) properties, a 2D honeycomb network, two chiral metal-organic frameworks (MOFs) and one porous MOF showing slow relaxation of the magnetisation. This study has increased the understanding of the self-assembly processes of LnIII ions under the influence of various aliphatic as well as aromatic carboxylate ligands. The second approach relies upon introducing an additional polyol ligand into the Lncarboxylate system, in order to investigate further the magneto-structural variations of the binary ligand system. This led to a variety of discrete molecular clusters ranging in nuclearity from 3 to 26, exhibiting SMM behavior. In addition to this, two 1D polymers with the highest energy barriers to reversal of the magnetization found for 4f-based single chain magnets reported so far and a 2D honeycomb network showing slow relaxation of its magnetization have been characterized. The third approach aimed to incorporate an additional metal ion, such as MnII, into the Ln-polyol-carboxylate system, thereby synthesizing heterometallic complexes with interesting magnetic properties. This resulted in a series of mixed-valent heterometallic decanuclear clusters exhibiting SMM behavior. Finally, the organic polyol ligand was replaced with a purely inorganic polyoxometalate anion, in order to synthesize some organic/inorganic hybrid materials with novel magnetic properties. This resulted in a series of polynuclear aggregates some of which show SMM behavior.
Author : P.S. Braterman
Publisher : Springer Science & Business Media
ISBN 13 : 1461307554
Total Pages : 419 pages
Book Rating : 4.4/5 (613 download)
Download or read book Reactions of Coordinated Ligands written by P.S. Braterman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This, the second and final volume of Reactions of Coordinated Ligands, describes the chemistry of ligands bound through non-carbon atoms, and of coordinated carbon dioxide. As before, emphasis is on the underlying mechanisms, which provide a unity of understanding for superficially disparate processes. The wide range of topics covered illustrates well both the versatility and the usefulness of coordination chemistry in the controlled activation of ligands. Looking to the future, carbon dioxide is the feedstock of last resort. The homogeneous reduction of dinitrogen to ammonia now seems unlikely to replace the Haber process, but solution reactions also lead to more complex, varied, and valuable products. Nitrogen monoxide, a "non innocent" ligand, impinges as pollutant and reagent. Its rich chemistry stems from its linked roles as three-electron donor, and as extremely powerful -acceptor. In the hydrolysis and condensation of complexed amides, esters etc. , metals act both as templates and as tunable and poly functional Lewis acids. Here the control of hydrophobic and steric interactions begins to model the subtle mechanisms of biological specificity. Finally, phosphorus and sulfur are imporant both as ligand atoms in themselves, and as anchors for other functionalities. I would like to thank all those who have been involved in the writing and production of this work, and also my colleagues old and new, at Glasgow and the University of North Texas, for their support. Paul S. Braterman v CONTENTS 1. Reactions of Coordinated Carbon Dioxide 1 J. D. Miller 1.
Author : Craig Lieberman
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.:/5 (936 download)
Download or read book Mixed Ligand Approach to Design Heterometallic Single-source Precursors for Low-temperature Preparation of Oxide Materials written by Craig Lieberman and published by . This book was released on 2015 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. A. McCleverty
Publisher : Newnes
ISBN 13 : 0080913164
Total Pages : 11845 pages
Book Rating : 4.0/5 (89 download)
Download or read book Comprehensive Coordination Chemistry II written by J. A. McCleverty and published by Newnes. This book was released on 2003-12-03 with total page 11845 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Coordination Chemistry II (CCC II) is the sequel to what has become a classic in the field, Comprehensive Coordination Chemistry, published in 1987. CCC II builds on the first and surveys new developments authoritatively in over 200 newly comissioned chapters, with an emphasis on current trends in biology, materials science and other areas of contemporary scientific interest.
Author : Hans Gildenast
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
Download or read book Tailoring Heteroditopic Ligands with S and P Donors for Heterometallic Coordination Polymers written by Hans Gildenast and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
