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Studies On New Diiminodiphosphine Type Ligands And Their Metal Complexes
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Book Synopsis Studies on New Diiminodiphosphine Type Ligands and Their Metal Complexes by : Ino C. Vei
Download or read book Studies on New Diiminodiphosphine Type Ligands and Their Metal Complexes written by Ino C. Vei and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Metal Complexes Derived from Quinone Type Ligands by : Mohammad Habib Johri
Download or read book A Study of Metal Complexes Derived from Quinone Type Ligands written by Mohammad Habib Johri and published by . This book was released on 1979 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies on the Synthesis and Characterization of Chiral Ligands and Their Metal Complexes by : Qiang Yu
Download or read book Studies on the Synthesis and Characterization of Chiral Ligands and Their Metal Complexes written by Qiang Yu and published by . This book was released on 1995 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Study of New Late Metal Complexes Featuring N-Phosphinoamidinate Ligands by : Colin M. Kelly
Download or read book Synthesis and Study of New Late Metal Complexes Featuring N-Phosphinoamidinate Ligands written by Colin M. Kelly and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Two-in-one Pincer Type Ligands and Their Metal Complexes for Catalysis by : Alexander Gers-Barlag
Download or read book Two-in-one Pincer Type Ligands and Their Metal Complexes for Catalysis written by Alexander Gers-Barlag and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis, characterization and first applications in catalysis of dinuclear metal complexes of the new Two-in-one pincer ligand scaffold are described in this work. Zinc(II) compexes were used to compare structural and electronical features of two derivatives of the ligand system. Reactivity studies revealed a broad range of reactions for a cobalt(II) complex, although detailed analysis of the reaction products was not possible so far. Furthermore, several rhodium(I) complexes have been synthesized and fully characterized. For a rhodium(I) carbonyl complex a dearomatization sequence wa...
Book Synopsis Synthesis and Characterization of New Dithiolate Ligands and Their Transition Metal Complexes by : Geewon Chung
Download or read book Synthesis and Characterization of New Dithiolate Ligands and Their Transition Metal Complexes written by Geewon Chung and published by . This book was released on 1994 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Peptide-type Tripodal Ligands and Their Metal Complexes by : Ágnes Dancs
Download or read book New Peptide-type Tripodal Ligands and Their Metal Complexes written by Ágnes Dancs and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most important directions of modern bioinorganic research is the development of artificial enzymes. One pathway of enzyme modeling strategy is the study of amino acid sequences present in the active centers of metalloenzymes. Linear peptides, however, have their limitations in reconstituting the active centers of metalloenzymes, since they do not possess the well-defined three dimensional structure, therefore their structure is vulnerable towards amide nitrogen coordination/hydrolysis. Improvement of metal binding capabilities of linear peptides can be obtained by e.g. their functionalization with tripodal ligands. Tripodal compounds may provide a rigid, less flexible platform for the coordinating amino acid side chains, creating pre-organized metal binding sites. In my thesis, I present synthesis and characterization of histidine containing tripodal peptide ligands and their complex formation in presence of copper(II) and zinc(II). Solution equilibrium was studied with pH potentiometric measurements, and several spectroscopic methods were used for structural characterization (UV-Vis, CD, ESR, NMR and MS methods). Beside thermodynamic and structural characterization, enzyme mimicking catalytical properties of the complexes have also been investigated (catechol oxidation, superoxide dismutation). Our results demonstrated that tripodal peptide ligands are capable of enhancing the stability of metal-peptide complexes, and they may provide convenient structures to efficiently mimic the catalytic functions of enzymes. With thorough and systematical solution equilibrium and spectroscopic studies, we uncovered the driving forces of metal coordination, and established the impact of the tripodal structure in stability, structure and catalytic properties of the forming complexes. Our findings confirm the beneficial effect of tripodal scaffolds in peptide-type ligand-metal complexes, and emphasize the possibilities lying within tripodal peptides in the field of enzyme mimicking.
Book Synopsis Studies on New Metal Ligand Complexes and Their Application in Olefin Polymerisation by :
Download or read book Studies on New Metal Ligand Complexes and Their Application in Olefin Polymerisation written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Studies of Metal Complexes of New Azamacrocyclic Ligands by : Hadi A. A. Omar
Download or read book Synthesis and Studies of Metal Complexes of New Azamacrocyclic Ligands written by Hadi A. A. Omar and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multidentate Phosphino-alkene Ligands and Their Late Transition Metal Complexes by : Amanda G. Jarvis
Download or read book Multidentate Phosphino-alkene Ligands and Their Late Transition Metal Complexes written by Amanda G. Jarvis and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis and characterisation of a new class of multidentate conformationally flexible phosphino-alkene ligands, called dbaPHOS (127) and monodbaPHOS (128), are described is this PhD thesis. The related phosphine sulphide ligands, namely dbaTHIOPHOS (137) and monodbaTHIOPHOS (149), have also been prepared. The coordination chemistry of the novel ligands was investigated with a variety of late-transition metals, including Cu, Rh, Pd and Pt. X-ray crystal structure determination of the complexes containing these ligands highlights the multiple coordination modes and versatility of each ligand system. The ability of the 1,4-dien-3-one backbone to adopt different conformational geometries around metal centers is of particular note. DbaPHOS (127) was found to act as a cis- and trans-chelating bisphosphine in both square planar PdII and PtII complexes. The 1,4-dien-3-one motif is hemilabile; exchange between coordinated and non-coordinated alkenes is observed in both the Pd0 complex, 167, and the related cationic CuI complex, 193. An investigation into the CuI complexes' activity in the cyclopropanation of styrene, as catalysts, showed that they are commensurate with other recently reported systems. In addition to the coordination chemistry of the novel ligand systems, some interesting findings emerged in the ligand synthesis and characterisation studies. For example, monodbaTHIOPHOS (149) undergoes an interesting solid-state [2+2] intramolecular cycloaddition transformation, giving cycloadduct, 206. Furthermore, 2-hydroperoxytetrahydrofuran was found to be an impurity in the microwave-assisted Horner-Wadsworth-Emmons reaction of 2-(diphenylthiophosphine)benzaldehyde (136) with 1,3-bis-(ethoxyphosphonato)-acetone (130) to give of dbaTHIOPHOS (137) and an unexpected THF insertion product, 138. The latter is explained by a side reaction involving the reduced compound, tetrahydrofuran-2-ol, derived from 2-hydroperoxytetrahydrofuran.
Book Synopsis Synthesis and Studies of Metal Complexes of New Azamacrocyclic Ligands by : H. A. A. Omar
Download or read book Synthesis and Studies of Metal Complexes of New Azamacrocyclic Ligands written by H. A. A. Omar and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Development and Study of New Chelating Ligands with Combinations of Pyridinylidene Amide (PYA) and Remote-NHC Donors as Supporting Ligands for Homogeneous Metal Catalysts by : Bikimi Ayiya
Download or read book The Development and Study of New Chelating Ligands with Combinations of Pyridinylidene Amide (PYA) and Remote-NHC Donors as Supporting Ligands for Homogeneous Metal Catalysts written by Bikimi Ayiya and published by . This book was released on 2019 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the design and syntheses of metal complexes that contain chelating ligands with different combinations of pyridinylidene amide (PYA), amidate, and remote-N-heterocyclic carbene (rNHC) or a mesoionic-remote-N-heterocyclic carbene (m-rNHC) donor functions. Although ligands with amidate donors are relatively well known, metal complexes of ligands containing the other donors are relatively unexplored. All these groups exhibit strong donating properties. It was expected that suitable metal complexes of these new ligands could show interesting catalytic activity in reactions such as transfer hydrogenation. In Chapter 1, an overview of the chemistry and existing synthetic routes to a range of different pyridine derived ligands are given. The coordination chemistry and applications of these classes of ligands are briefly discussed and the motivation for this work is outlined at the end. In Chapter 2, the syntheses of two new palladium(II) NC’N-tridentate pincer complexes ([Pd(L)(LPPy{Me}3)]OTf), L= Cl, OAc) that features both rNHC and two PYA donors are described. The tricationic pro-ligand [H2LPPy{Me}3][OTf]3, bearing two pendant alkylated 4-pyridyl arms at the 3,5-positions of the head group pyridine was metallated with Pd(OAc)2 or [PdCl2(PhCN)2] by heating with NaOAc in situ. The two complexes were stable in air and moisture, but sparingly soluble in common solvents and this precluded further studies. The smaller related bidentate pro-ligands [LmPy{Me}2]OTf and [LPPy{Me}2]OTf, were synthesised and on metallation by heating in the presence of acetate afforded [RhCl(LmPy{Me}2)Cp*]OTf and [RhCl(LPPy{Me}2)Cp*]OTf. X-ray crystallography and NMR studies of these complexes confirmed coordination occurred through PYA and rNHC donors. In Chapters 3 and 4, the syntheses of the sets of pro-ligands [HLp1-6{Bz}]Cl and [HLm1-6{Bz}]Clis described. The compounds within each set differ in that they have different substituents (e.g. Ph, Me, OMe, Naphthyl, Cl and NO2) in the para-position of the aryl ring attached to the insipient amidate nitrogen donor. On metallation, these pro-ligands coordinate as bidentate ligands with amidate and rNHC donors (in the case of [HLm1-6{Bz}]Cl) or amidate and m-rNHC donors (in the case of [HLp1-6{Bz}]Cl). Metallation of the pro-ligands using [IrCp*Cl2]2as the metal substrate gives the sets of neutral complexes [IrCl(Lm1-6{Bz})Cp*] and [IrCl(Lp1-6{Bz})Cp*]. The corresponding cationic complexes [Ir(Lx1-6{Bz})(L)Cp*]OTf(L= DMSO, CO, Py, x= m, p) were prepared by Ag+ promoted exchange of the chloride ligands in [IrCl(Lx1-6{Bz})Cp*] (x= m, p) with DMSO, CO or pyridine. Comparison of the molecular structures of both the neutral and cationic forms of all the complexes obtained via single-crystal XRD suggests that the complexes with the rNHC donors ([IrCl(Lm1-6{Bz})Cp*], [Ir(Lm1-6{Bz})(L)Cp*]OTf(L= DMSO, CO, Py) all exhibit a similar pattern of C–C bond lengths within the pyridinium ring of the rNHC donor with some 2,5-diene character. In contrast, the complexes with m-rNHC donors ([IrCl(Lp1-6{Bz})Cp*], [Ir(Lp1-6{Bz})(L)Cp*]OTf(L= DMSO, CO) the C–C bond lengths in the corresponding rings are nearly equal suggesting a more pronounced aromatic character in these cases. On treatment of the pro-ligands [HLm1-2{Bz}]Cl with RuCl3.xH2Othe complexes [RuCl(Lm2,3{Bz})(PPh3)2(CO)]Cl were obtained. Unlike the iridium complexes formed with the same pro-ligands, the donor groups in these complexes were the carbon of a rNHC and the oxygen of the unchanged carboxamide group. The catalytic activities of the complexes [Ir(Lx1-6{Bz})(L)Cp*]OTf(L = DMSO, x= m,p) and [RuCl(Lm2,3{Bz})(PPh3)2(CO)]Cl were tested in both transfer hydrogenation and dehydrogenation. The results of these studies are described in Chapter 5. Notably, it was found that the iridium mesoionic-rNHC-containing complexes with methoxy substituents were the most active in the dehydrogenation of benzyl alcohol to benzaldehyde, achieving 99.9% conversion under 12 h. In transfer hydrogenation using isopropanol as the hydrogen source, the same mesoionic-rNHC-containing iridium complexes with OMe substituents were also the best iridium catalysts. Complete conversion of benzaldehyde to benzyl alcohol with 2 mol% catalyst loading occurred in 8 min. However, the ruthenium complexes displayed exceptionally good transfer hydrogenation catalytic activity reaching 99.9% conversion within3 min at 1 mol% catalyst loading, with TOF 1700 h-1. It was proposed that the hemilabilenature of the O-bound carboxamide group, the ancillary ligands and trans-influence alongside the donor strength of the rNHC group were important factors for the high activity displayed by the Ru(II) complexes. Finally, the thesis conclusion is outlined in this chapter.
Book Synopsis Studies in Tridentate Hemilabile Ligands and Their Metal Complexes by : Kathryn Harkup
Download or read book Studies in Tridentate Hemilabile Ligands and Their Metal Complexes written by Kathryn Harkup and published by . This book was released on 2004 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Characterization, and Structural Studies of the Metal Complexes with Ligands Derived from Triazacycloalkanes and Related Compounds by : Delong Zhang
Download or read book Synthesis, Characterization, and Structural Studies of the Metal Complexes with Ligands Derived from Triazacycloalkanes and Related Compounds written by Delong Zhang and published by . This book was released on 1994 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preparative, Spectral and Structural Studies of New Metal Complexes with Polydentate Ligands of Medical Applicative Interest by : Franco Bisceglie
Download or read book Preparative, Spectral and Structural Studies of New Metal Complexes with Polydentate Ligands of Medical Applicative Interest written by Franco Bisceglie and published by . This book was released on 2002 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of Main Group Metal Complexes Containing New Phosphorus and Nitrogen Functionalised Ligands by : Alexander Rothenberger
Download or read book Studies of Main Group Metal Complexes Containing New Phosphorus and Nitrogen Functionalised Ligands written by Alexander Rothenberger and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis British National Bibliography for Report Literature by :
Download or read book British National Bibliography for Report Literature written by and published by . This book was released on 1998 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: