Download or read book Reactivity of the Five coordinate Transition Metal Complexes Toward Oxygen Carbon Monoxide and Nitrogen written by Vahdat Jahed and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In biological systems, O2 interaction with iron centers in enzyme structure occurs during respiration and the metabolic process. To fully understand the interaction mechanism, each step of the O2 reduction process is important and needs to be characterized. To this goal, we have synthesized and characterized a series of cationic five-coordinate iron complexes, [FeII(L)(L')]+ where L is TpMe, Me = hydrotris{3,5-dimethylpyrazol-1-yl}borate; TpPh, Me = hydrotris{3-phenyl-5-methylpyrazol-1-yl}borate; L'= 2,2'-bipyridine; 4,4'-dimethoxy-2,2'-bipyridine; 4,4'-dimethyl-2,2'-bipyridine; 4,4′-bis(trifluoromethyl)-2,2′-bipyridine; 4,4'-dibromo-2,2'-bipyridine. These complexes were utilized to activate O2 to isolate iron-oxygen intermediate species. The electronic spectra indicate intense absorption at 390 nm consisting of O2 binding to the mononuclear iron complex that generates an iron oxygen intermediate. In addition, the effect of the ligand on the stability of the potential intermediate was studied by altering the ligand substitute. We also treated the high-spin iron(II) reaction with CO to generate the corresponding adduct of low-spin iron(II). 1HNMR analysis reveals a diamagnetic complex arising from a spin-state change from S = 2 to S = 0. Furthermore, infrared spectroscopy has been used to support CO binding empirically. In chapter 3, my research studies nitrene chemistry. Nitrenes are chemically analogous to a single oxygen atom (i.e., NR vs. O). Therefore, nitrene can insert into other chemical bonds. Such reactivity can install synthetically valuable carbon-nitrogen bonds into hydrocarbon substrate. Affording shorter routes to high-value commodity chemicals. However, free nitrenes are generated with difficulty and often display rapid and unselective reactivity. Some degree of control can be achieved through the coordination of nitrene within the ligand field of a metal complex. Structural and electronic modifications affect nitrene reactivity and enable catalyst optimization by characterizing reactive intermediates. We provided a rare example of an octahedral high valent iron imido complex. In chapter 4, polydentate ligand systems have been used to synthesize a new series of late first-row transition metal complexes. We employed Tp hydrotris(pyrazolyl)borates and Bp hydrobis(pyrazolyl)borates to synthesize five-coordinate complexes, [(L)M(L')] where (L is TpPh, Me, TpMe, Me; L'= BpPh, Me, BpH, H; and M= Fe, Co, Ni) to investigate their coordination chemistry. Various sterically hindered ligand systems show an interesting effect on the ligand orientation in the complex structure.
Download or read book Synthesis and Reactivity of Early Transition Metal Complexes Containing Multiple Metal to Carbon Nitrogen Or Oxygen Bonds written by Scott M. Rocklage and published by . This book was released on 1982 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Reactivity of Transition Metal Carbonyl Complexes with Carbon Monoxide Coordinated Through Both Carbon and Oxygen written by Andrew Wong and published by . This book was released on 1981* with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On Being Well coordinated written by Fred Basolo and published by World Scientific. This book was released on 2003 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: This invaluable book distils the research accomplishments of Professor Fred Basolo during the five decades when he served as a world leader in the modern renaissance of inorganic chemistry. Its primary focus is on the very important area of chemistry known as coordination chemistry.Most of the elements in the periodic table are metals, and most of the chemistry of metals involves coordination chemistry. This is the case in the currently significant areas of research, including organometallic homogenous catalysis, biological reactions of metalloproteins, and even the solid state extended structures of new materials. In these systems, the metals are of primary importance because they are the sites of ligand substitution or redox reactions. In the solid materials, the coordination number of the metal and its stereochemistry are of major importance.Some fifty years of research on transition metal complexes carried out in the laboratory of Professor Basolo at Northwestern University is recorded here as selected scientific publications. The book is divided into three different major research areas, each dealing with some aspect of coordination chemistry. In each case, introductory remarks are presented which indicate what prompted the research projects and what the major accomplishments were. Although the research was of the academic, curiosity-driven type, some aspects have proven to be useful to others involved in projects that were much more applied in nature.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1976 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transition Metal Dinitrogen Complexes written by Yoshiaki Nishibayashi and published by John Wiley & Sons. This book was released on 2019-05-06 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive book that explores nitrogen fixation by using transition metal-dinitrogen complexes Nitrogen fixation is one of the most prominent fields of research in chemistry. This book puts the focus on the development of catalytic ammonia formation from nitrogen gas under ambient reaction conditions that has been recently repowered by some research groups. With contributions from noted experts in the field, Transition Metal-Dinitrogen Complexes offers an important guide and comprehensive resource to the most recent research and developments on the topic of nitrogen fixation by using transition metal-dinitrogen. The book is filled with the information needed to understand the synthesis of transition metal-dinitrogen complexes and their reactivity. This important book: -Offers a resource for understanding nitrogen fixation chemistry that is essential for explosives, pharmaceuticals, dyes, and all forms of life -Includes the information needed for anyone interested in the field of nitrogen fixation by using transition metal-dinitrogen complexes -Contains state-of-the-art research on synthesis of transition metal-dinitrogen complexes and their reactivity in nitrogen fixation -Incorporates contributions from well-known specialists and experts with an editor who is an innovator in the field of dinitrogen chemistry Written for chemists and scientists with an interest in nitrogen fixation, Transition Metal-Dinitrogen Complexes is a must-have resource to the burgeoning field of nitrogen fixation by using transition metal-dinitrogen complexes.
Download or read book Binding Activation and Transformation of Carbon Dioxide Mediated by Anionic Metal Complexes written by Jared Scott Silvia and published by . This book was released on 2011 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vanadium nitride complex [Na][NV(N['Bu]Ar) 3] reacts with CO to produce the vanadium tris-anilide complex V(N['Bu]Ar)3 and NaNCO. This is the first example of complete denitrogenation of a termainal nitride complex with generation of a lower coordinate metal complex. This reactivity contrasts sharply with the reactivity of the niobium analogue, where the nitride anion complex [Na][NNb(N['Bu]Ar) 3] is synthesized from the reductive decarbonylation of the niobium(IV) isocyanate complex (OCN)Nb(N['Bu]Ar) 3. Electrochemical studies of the niobium(IV) and vanadium(IV) isocyanate (OCN)V(N['Bu]Ar) 3 complexes are presented. The reactivity of the vanadium carbamate complex [(THF) 2Na][O2CNV(N['Bu]Ar) 3] with electrophilic reagents is presented. The carbamate complex reacts readily with silylation and alkylation reagents to form the carbamate ester complexes of the type ROC(O)NV(N['Bu]Ar) 3. The vanadium carbamate complex reacts with SO2 via a decarboxylation pathway to produce the sulforyl imido complex [Na][O 2SNV(N['Bu]Ar)3], the solid-state structure of which is presented. The reactivity of the vanadium carbamate complex with typical dehydrating reagents, e.g organic acid anhydrides, is shown to proceed cleanly when cobaltocene, acting as an in situ reductant, is present to form the vanadium(IV) isocyanate complex (OCN)V(N['Bu]Ar) 3. The synthesis and structure of the bimetallic complex (TPP)MnOC(O)NV(N['Bu]Ar) 3 (TPP = tetraphenylporphyrin) is presented. Although thermally stable, the complex undergoes a photochemical transformation that forms the vanadium isocyanate complex and putative OMn(TPP), which reacts with triphenylphosphine in the reaction mixture to produce triphenylphosphine oxide. The synthesis the niobium carbamate complex [Na][O 2CNNb(N['Bu]Ar) 3] from the reaction of [Na][NNb(N[Bu]Ar) 3] with CO2 is presented. Its solid-state structure in the form of the ionpair [(12-crown-4) 2Na][O2CNNb(N['Bu]Ar) 3] has been determined. Reaction of the niobium carbamate complex with organic acid anhydrides results in the production of five-coordinate carboxylate, acetate complexes (RC(O)O)(OCN)Nb(N['Bu]Ar) 3. The reduction of these complexes by two electrons results in the regeneration of the niobium nitride complex (60-80% yield) with concomitant release of CO (30-60% yield). This three-step process represents a highly controlled conversion of CO2 to CO via a ligand-based strategy. The reactivity of CO2 with anionic complexes featuring terminal multiply bonded ligands is extended to the oxo anion complex [(Et 2O)2Li][OTi(N['Bu]Ar) 3] resulting in the formation of the carbonate complex ([Li][O 2COTi(N['Bu]Ar) 3]) 6. The binding of CO2 to the oxo complex is reversible when 12-crown-4 is bound to the lithium countercation or if the complex is dissolved in THF. The thermodynamic parameters for the CO2 binding equilibrium have been measured. Exchanging the lithium countercation for sodium or potassium results in a significant weakening of the CO2 binding ability of the oxo complex.
Download or read book Journal of Scientific Industrial Research written by and published by . This book was released on 1967 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cyclometalation Reactions written by Iwao Omae and published by Springer Science & Business Media. This book was released on 2014-01-23 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a review of cyclometalation reactions and organometallic intramolecular-coordination five-membered ring products, the most active type of reactions in synthetic organic reactions and their products. Included is the discovery of intramolecular-coordination bonds in cyclometalation reactions and the characteristics of those reactions, as well as the reasons that their five-membered ring compounds are very easily synthesized through such reactions. In addition, the applications of cyclometalation reactions and five-membered ring products, synthetic applications, catalysts, and other products are described. These topics are of special interest for industrial researchers.
Download or read book Progress in Inorganic Chemistry Volume 50 written by Kenneth D. Karlin and published by John Wiley & Sons. This book was released on 2001-07-27 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: This series provides inorganic chemists and materials scientists with a forum for critical, authoritative evaluations of advances in every area of the discipline. Volume 50 continues to report recent advances with a significant, up-to-date selection of contributions on topics such as the following: Structural and mechanistic investigations in asymmetric copper; Catalyzed reactions; Phenoxyl radical complexes; Synthesis of large pore zeolites and molecular sieves; Inorganic nanoclusters with fullerene-like structure and nanotubes
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1996 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compounds Containing As N Bonds written by Larry K. Krannich and published by . This book was released on 1976 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Catalytic Activation of Dioxygen by Metal Complexes written by László I. Simándi and published by Springer Science & Business Media. This book was released on 2006-04-11 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of dioxygen activation and homogeneous catalytic oxidation by metal complexes has been in the focus of attention over the last 20 years. The widespread interest is illustrated by its recurring presence among the sessions and subject areas of important international conferences on various aspects of bioinorganic and coordination chemistry as well as catalysis. The most prominent examples are ICCC, ICBIC, EUROBIC, ISHC, and of course the ADHOC series of meetings focusing on the subject itself. Similarly, the number of original and review papers devoted to various aspects of dioxygen activation are on the rise. This trend is due obviously to the relevance of catalytic oxidation to biological processes such as dioxygen transport, and the action of oxygenase and oxidase enzymes related to metabolism. The structural and functional modeling of metalloenzymes, particularly of those containing iron and copper, by means of low-molecular complexes of iron, copper, ruthenium, cobalt, manganese, etc., have provided a wealth of indirect information helping to understand how the active centers of metalloenzymes may operate. The knowledge gained from the study of metalloenzyme models is also applicable in the design of transition metal complexes as catalytsts for specific reactions. This approach has come to be known as biomimetic or bioinspired catalysis and continues to be a fruitful and expanding area of research.
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1996 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Manganese Coordination compounds sect 1 8 Coordination compounds 1 8 written by and published by . This book was released on 1990 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal written by American Chemical Society and published by . This book was released on 2004 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
