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Intramolecular Electron Transfer At Metal Surfaces V Pendant Substituent Effects Upon Thiocarboxylate Bridged Cobaltiii Reduction Kinetics At Mercury And Gold Electrodes
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Book Synopsis Intramolecular Electron Transfer at Metal Surfaces. V. Pendant Substituent Effects Upon Thiocarboxylate-Bridged Cobalt(III) Reduction Kinetics at Mercury and Gold Electrodes by : T. T. T. Li
Download or read book Intramolecular Electron Transfer at Metal Surfaces. V. Pendant Substituent Effects Upon Thiocarboxylate-Bridged Cobalt(III) Reduction Kinetics at Mercury and Gold Electrodes written by T. T. T. Li and published by . This book was released on 1985 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unimolecular rate constants are reported for the reduction of pentaamminecobalt (III) anchored to mercury or gold electrodes via thiocarboxylate bridging ligands having the general form RSCH2COO ( - ). Since the carboxylate is bound to Co(III) and sulfur provides the surface binding group, the substituent R (where is various alkyl, carboxylate, ketone, or aromatic groups) will be pendant to the thiocarboxylate bridge linking the surface and cobalt reacting centers. Aleration of the pendant group R yields only small (ca. up to 4 fold) variations in unimolecular rate constants at a given electrode potential, although slightly larger variations occur in the stability of the precursor (absorbed reactant) state at mercury electrodes that are apparently due to specific interactions between R and the metal surface. The insensitivity of unimolecular rate constants to the pendant group is compared and contrasted with the effects of varying the substituent that bridges the redox center to the metal surface. Comparisons are also made with the pendent group effects for related redox processes in homogeneous solution. Originator furnished key words include: Bridging ligands, Pendent group effects, Surface excess, Percursor state.
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1985 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1985 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Chemical Society, Committee on Professional Training Staff Publisher : ISBN 13 :9780841214187 Total Pages :1390 pages Book Rating :4.2/5 (141 download)
Book Synopsis American Chemical Society Directory of Graduate Research, 1987 by : American Chemical Society, Committee on Professional Training Staff
Download or read book American Chemical Society Directory of Graduate Research, 1987 written by American Chemical Society, Committee on Professional Training Staff and published by . This book was released on 1987 with total page 1390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Intramolecular Electron Transfer at Metal Surfaces. III. Influence of Bond Conjugation on Reduction Kinetics of Cobalt(III) Anchored to Metal Surfaces Via Thiophenecarboxylate Ligands by : T. T. T. Li
Download or read book Intramolecular Electron Transfer at Metal Surfaces. III. Influence of Bond Conjugation on Reduction Kinetics of Cobalt(III) Anchored to Metal Surfaces Via Thiophenecarboxylate Ligands written by T. T. T. Li and published by . This book was released on 1983 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unimolecular rate constants, K sub et, are reported for the one-electron electroreduction of pentaamminecobalt (III) anchored to mercury, gold, or copper electrodes via various thiophenecarboxylate ligands where the thiophene sulfur acts as the surface binding group and the carboxylate is coordinated to the cobalt reactants. At mercury, the rate parameters were found to be sensitive to the bridging ligand structure, substantially (ca. 10-20 fold) smaller values of K sub et being found for ligands containing one or more methylene groups between the thiophene sulfur and carboxylate oxygen than those featuring uninterrupted bond conjugation between the metal surface donor and Co(III) acceptor sites. Various contributions to these reactivity differences are asse-sed on the basis of the measured variations in the stability constants of the adsorbed precursor state, the rate constants for the homogeneous reduction of these complexes by hexammineruthenium (II), the unimolecular frequency factors obtained from the electrochemical activation parameters, and by comparison with ele-trochemical outer-sphere rate data. Taken together, these results provide strong evidence that the smaller values of K sub et values of the electronic transmission coefficient than are achieved with the conjugated ligands. Comparison is made with analogous results for intramolecular electron transfer via extended organic ligands in homogeneous solution. (Author).
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1985 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Intramolecular Electron Transfer at Metal Surfaces. IV. Dependence of Tunneling Probability Upon Donor-Acceptor Separation Distance by : T. T. T. Li
Download or read book Intramolecular Electron Transfer at Metal Surfaces. IV. Dependence of Tunneling Probability Upon Donor-Acceptor Separation Distance written by T. T. T. Li and published by . This book was released on 1984 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unimolecular electron-transfer rate constants, k sub et, are reported for the one-electron reduction of pentaaminecobalt (III) attached to gold and mercury electrodes via thioalkylcarboxylate ligands containing varying numbers, n, of alkyl carbons. While similar values of k sub et were found at mercury for each reaction, for close-packed monolayers at gold the k sub et values decreased by circa 10 to the 4th power as an increased from one to five. This effect is identified with increasingly nonadiabatic pathways as an increases, a linear plot of log k sub et versus n being obtained. The results provide estimates of the electronic transmission coefficient as a function of the surface-Co(III) separation distance.
Book Synopsis Intramolecular Electron Transfer at Metal Surfaces. I. Relative Energetics of Some Corresponding Outer- and Inner-Sphere Pathways Involving Halide and Pseudohalide Bridging Ligands by : S. W. Barr
Download or read book Intramolecular Electron Transfer at Metal Surfaces. I. Relative Energetics of Some Corresponding Outer- and Inner-Sphere Pathways Involving Halide and Pseudohalide Bridging Ligands written by S. W. Barr and published by . This book was released on 1983 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electroreduction kinetics of a number of Co(III) ammine and ethylene-diamine complexes containing chloride, bromide, and isothiocyanate ligands have been studied at platinum- and gold-aqueous interfaces in order to investigate the consequences of attaching simple transition-metal reactants to electrocatalytic metal surfaces upon the electron-transfer energetics. The virtues of evaluating unimolecular rate constants k sub et (per sec) for comparing the energetics of electrochemical inner- and outer-sphere pathways are pointed out.
Book Synopsis Electron-Transfer Kinetics of Redox Centers Anchored to Metal Surfaces: Weak- Versus Strong-Overlap Reaction Pathways by : S. W. Barr
Download or read book Electron-Transfer Kinetics of Redox Centers Anchored to Metal Surfaces: Weak- Versus Strong-Overlap Reaction Pathways written by S. W. Barr and published by . This book was released on 1983 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unimolecular rate constants k sub et are presented for the one-electron electroreduction of various CoIII(NH3)5X complexes bound to mercury, platinum, and gold surfaces via either small inorganic or extended organic ligands X. These 'surface intramolecular' rate parameters are compared with estimates of k sub et for outer-sphere pathways obtained from homogeneous rate data in order to ascertain the consequences of reactant-surface binding upon the electron-transfer energetics. Only small or moderate decreases in the elementary reorganization barrier Delta G* sub et occur upon surface attachment, suggesting the occurrence of weak-overlap pathways. Aside from the dependence of k sub et upon the bridging ligand X at a given electrode potential due to differences in thermodynamic driving force, the observed variations in k sub et appear to be due in part to variations in the electronic transmission coefficient k sub el. Measurements of electrochemical frequency factors for reactants containing a series of thiophenecarboxylate bridges indicate that the substantial decreases in k sub et observed upon interruption of ligand conjugation arise predominantly from decreases in k sub el. (Author).
Book Synopsis New-Generation Bioinorganic Complexes by : Renata Jastrzab
Download or read book New-Generation Bioinorganic Complexes written by Renata Jastrzab and published by Walter de Gruyter GmbH & Co KG. This book was released on 2016-03-21 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bio-Inorganic compounds are successfully applied as therapeutic agents since decades. Thus, scientist designed new metal complexes bearing biomolecules as ligands, investigating their potential as bioactive and therapeutic agents. This book presents a comprehensive overview on materials design, substance classes and their characterization. This book is compiled for scientists interested in medical application of bioinspired materials.
Book Synopsis Microbial Metabolic Engineering by : Christine Nicole S. Santos
Download or read book Microbial Metabolic Engineering written by Christine Nicole S. Santos and published by Humana Press. This book was released on 2019-02-21 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers a wide array of topics that will aid researchers in the task of engineering complex biological systems. This book is divided into three parts: Part One discusses the discovery and identification of relevant biosynthetic pathways for engineering; Part Two looks at the development of genetic tools for manipulating enzymes, biosynthetic pathways, and whole genomes; and Part Three covers the characterization of engineered microbes using targeted and global systems biology tools, as well as in silico models. Chapters explore topics such as leveraging enzyme promiscuity to construct novel biosynthetic pathways; assembling combinatorial multigene pathways for rapid strain optimization; applying 'omics technologies for identifying bottlenecks; and engineering nontraditional host organisms like cyanobacterium and Yarrowia lipolytica. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Cutting edge and authoritative, Microbial Metabolic Engineering: Methods and Protocols is a valuable resource for researchers and scientists interested in engineering and optimizing microbes for a variety of biotechnological applications.
Book Synopsis Metal Complex - DNA Interactions by : Nick Hadjiliadis
Download or read book Metal Complex - DNA Interactions written by Nick Hadjiliadis and published by John Wiley & Sons. This book was released on 2009-03-30 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal ions and metal complexes have long been recognized ascritically important components of nucleic acid chemistry, both inregulation of gene expression and as promising therapeutic agents.Understanding how metal complexes interact with DNA has become anactive research area at the interface between chemistry, molecularbiology and medicine. Metal Complex - DNA Interactions provides a comprehensiveoverview of this increasingly diverse field, presenting recentdevelopments and the latest research with particular emphasis onmetal-based drugs and metal ion toxicity. The text is divided intofour parts: Basic Structural and Kinetic Aspects: includes chapterson sequence-selective metal binding to DNA and thermodynamicmodels. Medical Applications: focuses on anticancer platinumdrugs, including discussions on DNA repair in antitumor effects ofplatinum drugs and photo-dynamic therapy. DNA-Recognition - Nucleases and Sensor: describesprobes for DNA recognition, artificial restriction agents,metallo-DNAzymes for metal sensing applications and metal iondependent catalysis in nucleic acid enzymes. Toxicological Aspects: deals with structural studies ofmercury–DNA interactions, chromium-induced DNA damage andrepair, and the effect of arsenic and nickel on DNAintegrity. This book will be a valuable resource for academic researchersand professionals from a range of pharmaceutical and chemicalindustries, particularly those involved in the development of newand less toxic anticancer metallo-drugs, and in the field ofenvironmental and toxicological chemistry.
Book Synopsis Advances in Spectroscopy: Molecules to Materials by : Dheeraj Kumar Singh
Download or read book Advances in Spectroscopy: Molecules to Materials written by Dheeraj Kumar Singh and published by Springer. This book was released on 2020-10-26 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents and discusses recent developments in the broad field of spectroscopy, providing the reader with an updated overview. The main objective is to introduce them to recent innovations and current trends in spectroscopy applied to molecules and materials. The book also brings together experimentalists and theoreticians to highlight the multidimensional aspects of spectroscopy and discuss the latest issues. Accordingly, it provides insights not only into the general goals of spectroscopy, but also into how the various spectroscopic techniques represent a toolbox that can be used to gain a more detailed understanding of molecular systems and complex chemical problems. Besides technical aspects, basic theoretical interpretations of spectroscopic results are also presented. The spectroscopy techniques discussed include UV-visible absorption spectroscopy, Raman spectroscopy, IR absorption spectroscopy, fluorescence spectroscopy, and time-resolved spectroscopy. In turn, basic tools like lasers and theoretical modeling approaches are also presented. Lastly, applications for the characterization of fundamental properties of molecules (environmental aspects, biomolecules, pharmaceutical drugs, hazardous molecules, etc.) and materials (nanomaterials, nuclear chemistry materials, biomaterials, etc.) are discussed. Given its scope, the book offers a valuable resource for researchers from various branches of science, and presents new techniques that can be applied to their specific problems.
Download or read book New Materials written by S.K. Joshi and published by Springer. This book was released on 1992-08-31 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: A discussion-meeting on "New Materials" was organized on October 24-26, 1991 by the Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, under the sponsorship of the Indian National Science Academy, Japan Society for Promotion of Science, Council of Scientific and Industrial Research and the Materials Research Society of India. A number of distinguished scientists from India and Japan presented state-of-the-art lectures on important aspects of materials science and technology. Today we are witnessing an unprecedented advance in the science and technology of materials, occurring at a rapid pace. The main objective of the meeting was to bring active scientists in this area from Japan and India together, to exchange ideas and share the excitement of this field. For this pmpose, a number of young workers were also invited to participate in the meeting. It was our view that a publication based on these lectures would be of great value. The topics covered in the meeting were diverse and included many aspects of modern materials.
