Download or read book The Coordination Chemistry of Some Polydentate Ligands Part I Complexes of 2 salicylideneaminomethyl pyridine Part Ii Complexes of 2 2 Diamino Methyl 1 3 Diaminopropane and of Tetra salicylidene Aminomethyl methane written by and published by . This book was released on 1964 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Coordination Chemistry of Some Polydentate Ligands written by Richard Wallace Oehmke and published by . This book was released on 1964 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Dissertation Index 1861 1972 Chemistry written by Xerox University Microfilms and published by . This book was released on 1973 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts written by and published by . This book was released on 1964 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstracts of dissertations and monographs in microform.
Download or read book The Synthesis and Coordination Chemistry of Two Families of Polydentate Ligands Exploring Their Potential for the Preparation of Molecule Based Magnets written by NILOOFAR. ZARRABI and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Coordination Chemistry of Noncyclic and Macrocyclic Thioether diazine Polydentate Ligands written by Liqin Chen and published by . This book was released on 1993 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Synthesis and Reactivity of Bimetallic Complexes of Dimethylplatinum II Containing Ditopic Ligands written by Matthew S. McCready and published by . This book was released on 2015 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a study of monometallic and bimetallic dimethylplatinum(II) complexes containing ditopic nitrogen donor ligands. This work details the design and synthesis of side-to-side and cofacial arranged ligands and their respective coordination chemistry. The study of the synthesis, characterization and reaction mechanisms of the various dimethylplatinum(II) complexes is outlined in detail with special emphasis focused on the reactivity of the complexes towards oxidative addition. The ditopic ligand 6-dppd, 1,4-di(2-pyridyl)-5,6,7,8,9,10- hexahydrocycloocta[d]pyridazine, was observed to coordinate only a single equivalent of a platinum(II) center. The inability to coordinate a second equivalent, even through an assisted bridging atom, is presumed to be due to a steric clash between the free pyridyl group and the cyclooctyl backbone. In attempts to make heterobimetallic complexes of 6-dppd, the complex [PtMe2(6-dppd)] was observed to react preferentially with mercuric halides by oxidative addition rather than coordination of the mercuric salt in the second coordination site giving complexes [PtXMe2(HgX)(6-dppd)] where X = Br, Cl, OAc. This indicates that the platinum center is actually a better nucleophile than the free pyridyl nitrogen atom. The oxidative addition of solvent dichloromethane was also observed showing the enhancedreactivity of [PtMe2(6-dppd)]. Finally, [PtMe2(6-dppd)] was treated with DCl at low temperature to give the deuteridoplatinum(IV) complex. The deuteridoplatinum(IV) complex reductively eliminates methane in solution and extensive H/D exchange occurs into the CH4 product at low temperature indicating very easy reversibility of the exchange between hydridomethylplatinum(IV) and methaneplatinum(II) complexes. The abstraction of a chloride ligand from [PtClMe(6-dppd)] led to the formation of a complex dimer structure endo, endo-[Pt2Me2(?2-?3-6-dppd)2][OTf]2. This process allowed for the formation of a bimetallic platinum(II) complex which retained the initial stereochemistry. The protonolysis of [PtMe2(6-dppd)] with one equivalent of HOTf led to the generation of methane gas and the concomitant formation of both endo, endo-[Pt2Me2(?2-?3-6-dppd)2][OTf]2 and exo, exo-[Pt2Me2(?2-?3-6-dppd)2][OTf]2. The structures of the exo isomeric clamshell dimers appeared much less sterically hindered in the solid state and were observed experimentally and computationally to be the thermodynamically preferred isomers. The mechanism, selectivity and reversibility of this isomerism process was explored in detail. The reactions of [PtMe2(6-dppd)] with alkyl bromides RCH2Br, which possess hydrogen bonding functionality, result in the formation of stable organoplatinum(IV) complexes capable of forming supramolecular structure via hydrogen bonding. Both intra and inter molecular hydrogen bonding is observed in the formation of supramolecular architectures which self-assemble in the solid state through additional?-stacking and weak secondary interactions. The new anthracene derived ditopic ligands, bpad = N1,N8-bis(pyridin-2- ylmethylene)anthracene-1,8-diamine and adpa = (N, N)-4,4'-(anthracene-1,8-diylbis(ethyne- 2,1-diyl))-bis(N-(pyridin-2-ylmethylene)aniline) were prepared, characterized and used to coordinate dimethylplatinum(II) centers giving cofacial bimetallic complexes of dimethylplatinum(II). [Pt2Me4(bpad)] was shown to degrade over time in solution through a proposed metalation event involving the anthracene backbone. The oxidative addition of a variety of substrates was performed using [Pt2Me4(adpa)] giving stable diplatinum(IV) complexes as characterized by 1H NMR spectroscopy. The new xanthene derived ditopic ligands, ppxda = 2,7-di-tert-butyl-9,9-dimethyl-N4,N5-bis(4-(pyridin-2- ylmethyleneamino)phenyl)-xanthene-4,5-dicarboxamide and pmxda = 2,7-di-tert-butyl-9,9- dimethyl-bis(pyridine-2-ylmethylene)-9H-xanthene-4,5-diamine were prepared characterized and used to ligate two equivalents of a dimethylplatinum(II) center. Diplatinum complexes of both ligands were shown to easily undergo oxidative addition to give the corresponding diplatinum(IV) complexes which adopt the anti orientation. The syn alignment of metal centers was accessible through the abstraction of halides ligands and incorporation of bridging groups as is the case for the pyrazine bridged bimetallic platinum complex [Pt2Me6(C4H4N2)(pmxda)][OSO2CF3]2.
Download or read book Synthesis and Coordination Chemistry of a New mercaptoimidazolyl pyridine Ligand written by Jessica Lauren Bongiovanni and published by . This book was released on 2011 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new mixed-donor ligand containing both pyridine and thione donor groups, o-(3-methyl-2-mercaptoimidazolyl)pyridine (o-mpyMe), has been synthesized. The ligand has good solubility and stability in organic solvents, as well as partial solubility in water. The coordination chemistry of this new ligand with metals such as manganese(I), rhenium(I), cobalt(II), nickel(II), copper(I), silver(I), zinc(II), cadmium(II), mercury(II), indium(III), antimony(III) and bismuth(III), leading to an assortment of coordination modes and reactivity. Most significantly, copper(I) complexes of o-mpyMe were prepared with the aim of generating potential synthetic analogues of the metal center in methanobactin, a copper-binding compound. Methanobactin (mb) is responsible for the uptake and transport of copper to the enzyme methane monooxygenase (MMO), which oxidizes methane gas to methanol in the global carbon cycle. The active site of mb consists of a tetrahedral Cu(I) center with N2S2 coordination. Characterization, reactivity and biological activity of [Cu(o-mpyMe)2]X (X = BF4, PF6) to determine if these complexes are viable analogues of methanobactin has been carried out.
Download or read book A Study of Some Metal Complexes of the Polydentate Ligand 1 4 DI 2 pyridyl aminophthalazine written by James Alfred Doull and published by 1979.. This book was released on 1979 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coordination Chemistry of Diindole Ligands written by Ian Mallov and published by . This book was released on 2010 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Polypyridyl Pyrazolate bridging Dinucleating Ligands Containing Hydrogen bond Donors written by Kwanyi Ng and published by . This book was released on 2012 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first chapter of this dissertation describes the importance of hydrogen bonding (H-bonding) within the secondary coordination sphere of metal complexes. Particular emphasis is given to the correlations between the structures of metalloenzyme actives and their functions. Classical examples of synthetic metal complexes, which are designed to mimic some of the features of metalloenzyme active sites, are also reviewed. The detection of reactive intermediates in the mononuclear systems has inspired the development of the dinucleating ligands, which is the cornerstone of the work described in this dissertation. In Chapter 2, the synthesis of a (carboxyamido)pyridinepyrazolate (H5bppap) dinucleating ligand is described. Bimetallic iron and cobalt complexes of H5bppap ([MII2H2bppap]+) showed structural differences in both their primary and secondary coordination spheres. The [CoII2H2bppap]+ is 5,5-corodinate while [FeII2H2bppap]+ is 5,6-coordinate. The binding of small molecules into the preorganized ligand cavity is verified by the hydration of [FeII2H2bppap]+ and [CoII2H2bppap]+, leading to the formation of complexes [{CoII(OH)}CoIIH3bppap]+ and [{FeII(OH)}FeIIH3bppap]+, in which only one of the metal centers has a terminal hydroxo ligand. Chapter 3 will present the synthesis and characterization of a dimanganese(II) complex, [MnII2H2bppap]+. The coordination chemistry of the dimanganese(II) analog of H5bppap is considerably different from its iron and cobalt counterparts. The insertion of external ligands into [MnII2H2bppap]+ with simultaneous protonation of the ligand backbone led to the isolation of a series of seven-coordinate dinuclear MnII species, [MnII2([mu]61549;-X)H4bppap]2+. Chapter 4 illustrates the design and synthesis of a dinucleating ligand, 3,5-Bis[bis(N-6-neopentylamino-2-pyridylmethyl)aminomethyl]-1H-pyrazole (H5bnppap). The syntheses and characterization of the corresponding dinuclear bis(hydroxo) complexes, [MII2H4bnppap(OH)2]+ are discussed. These complexes feature the rare terminal bis(OH) moiety within one molecular unit with the MII-OH units are positioned in a syn-configuration, placing the hydroxo ligands in close proximity (ca. 3 Å apart), which may be a prerequisite for water oxidation. The second part of the chapter describes the hydrolytic studies utilizing [CoII2H4bnppap(OH)2]+. Both [CoII2H4bnppap(OH)2]+ and [{CoII (OH)}MIIH3bppap]+ are able to hydrolyze carbon dioxide to give carbonate-bridged complexes. However, only [CoII2H4bnppap(OH)2]+ is able to hydrolyze triphenylborane to triphenylborate. These results indicate that control of the number of hydroxide ligands within the bimetallic cavity could be used as a strategy to regulate activity of metal-hydroxo complexes.
