Electron Transfer Reactions of Macrocyclic Complexes of Cobalt (III). PDF Download
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Author: Maria Padoch Liteplo
Publisher:
ISBN:
Category : Cobalt
Languages : en
Pages : 159
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Book Description
Author: Maria Padoch Liteplo
Publisher:
ISBN:
Category : Cobalt
Languages : en
Pages : 159
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The kinetics and mechanisms of reduction of H2O2, Br2, and I2 by various macrocyclic tetraaza complexes of cobalt(II), including Vitamin B/sub 12r/, were studied. The synthetic macrocycles studied were all 14-membered rings which varied in the degree of unsaturation, substitution of methyl groups on the periphery of the ring, and substitution within the ring itself. Scavenging experiments demonstrated that the reductions of H2O2 produce free hydroxyl radicals only in the case of Co((14)ane)/sup 2 +/ but with none of the others. In the latter instances apparently H2O2 simultaneously oxidizes the metal center and the ligand. The reductions of Br2 and I2 produce an aquohalocobalt(III) product for all reductants (except B/sub 12r/ + Br2, which was complicated by bromination of the corrin ring). The mechanism of halogen reduction was found to involve rate-limiting inner-sphere electron transfer from cobalt to halogen to produce a dihalide anion coordinated to the cobalt center. This intermediate subsequently decomposes in rapid reactions to halocobalt(III) and halogen atom species or reacts with another cobalt(II) center to give two molecules of halocobalt(III). The reductions of halomethylcobaloximes and related compounds and diamminecobaloxime by Cr/sup 2 +/ were also studied. The reaction was found to be biphasic in all cases with the reaction products being halomethane (for the halomethylcobaloximes), Co/sup 2 +/ (in less than 100 percent yield), a Cr(III)-dimethylglyoxime species, a small amount of free dmgH2, and a highly-charged species containing both cobalt and chromium. The first-stage reaction occurs with a stoichiometry of 1:1 producing an intermediate with an absorption maximum at 460 nm for all starting reagents. The results were interpreted in terms of inner-sphere coordination of the cobaloxime to the Cr(II) and electron transfer through the oxime N-O bond.
Author: Mark Erick Brynildson
Publisher:
ISBN:
Category :
Languages : en
Pages : 418
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Author: Roger Allen Heckman
Publisher:
ISBN:
Category :
Languages : en
Pages : 380
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Book Description
Author: Gordon Melson
Publisher: Springer Science & Business Media
ISBN: 1461329280
Category : Science
Languages : en
Pages : 676
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Book Description
Chemists have been aware of the existence of coordination compounds con taining organic macrocyclic ligands since the first part of this century ; however, only during the past few years have they expanded research into the chemistry of these compounds. The expansion was initiated in the early 1960s by the synthesis and characterization of compounds containing some new macrocyclic ligands. The synthesis of compounds which may serve as model systems for some natural products containing large rings as ligands provided the main goal for the early expansion of research effort; indeed, a recurrent theme behind much of the reported chemistry has been the analogy between synthetic macrocyclic compounds and many natural-product systems. More recently, the emphases of reported research have ranged over the whole spectrum of chemistry, and the number of publications that discuss macrocyclic chemistry has increased at a dramatic rate. The completed research has been reported in a variety of journals throughout the world but there has been no previous attempt to bring the major developments together under one cover. This book, therefore, attempts to satisfy the need for a single source in which there is both a collection and a correlation of information concerning the coordination chemistry of macrocyclic compounds. The chapters in this book discuss various aspects of macrocyclic chemistry, and while these chapters as a whole constitute an in-depth survey of the state-of the-art of the field, each chapter is written as a complete unit.
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 872
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Author: Ghazala Ali
Publisher:
ISBN:
Category : Cobalt
Languages : en
Pages : 204
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Author: Ramesh Chandra A. Patel
Publisher:
ISBN:
Category : Cobalt
Languages : en
Pages : 211
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Book Description
Author: Michael Edward Ketterer
Publisher:
ISBN:
Category : Cobalt
Languages : en
Pages : 290
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Book Description
Author: R. D. Cannon
Publisher: Butterworth-Heinemann
ISBN: 1483103293
Category : Science
Languages : en
Pages : 364
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Book Description
Electron Transfer Reactions deals with the mechanisms of electron transfer reactions between metal ions in solution, as well as the electron exchange between atoms or molecules in either the gaseous or solid state. The book is divided into three parts. Part 1 covers the electron transfer between atoms and molecules in the gas state. Part 2 tackles the reaction paths of oxidation states and binuclear intermediates, as well as the mechanisms of electron transfer. Part 3 discusses the theories and models of the electron transfer process; theories and experiments involving bridged electron transfer; optical electron transfer; and electron transfer in the solid state. The text is recommended for chemists who would like to know more about the principles and mechanisms behind electron transfer reactions.
