Download or read book Investigations of Iron nitrogen Bonding at Synthetic Iron sulfur Clusters written by Arun Sridharan (Scientist in chemistry) and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The coordination chemistry of nitrogenous ligands at high-spin iron is investigated through the synthesis and characterization of a terminal imido complex of a cuboidal tetra([mu]3-sulfido)tetrairon (Fe4S4) cluster. Structural, spectroscopic, and computational studies establish a dynamic interplay between Fe-N, Fe-S, and Fe-Fe interactions, tuned by the Fe centers' locally high-spin electron configurations and the pseudo-C[subscript 3v] symmetry of the imido-bound metal site. Reaction with 1,4-cyclohexadiene affords clean conversion to the corresponding [Fe4S4] anilido complex, which was characterized in two oxidation states. Oxidation and reduction of the [Fe4S4] terminal imido complex affords a four-membered redox series spanning the 1−/0/1+/2+ charge states. A combined spectroscopic and theoretical analysis of this redox series using variable-temperature 1H nuclear magnetic resonance spectroscopy reveals that oxidation events are primarily centered at the imido fragment, which takes on an iminyl ([NAr]̇̇−) or triplet nitrene ([NAr]2̇·) configuration depending on the charge state of the molecule. Two-electron oxidation of [Fe4S4]+ anilido complexes results in formal aminyl radical reductive elimination, generating aniline, hydrazine, and/or azoarene as byproducts along with the corresponding [Fe4S4]2+ solvento adduct. Addition of 1,2-diarylhydrazine to the [Fe4S4]+ solvento adduct results in N-N binuclear oxidative addition to afford the [Fe4S4]2+ anilido complex, which upon further reaction with 1,2-diarylhydrazines catalyzes their disproportionation to aniline and azoarene. The development of new synthetic platforms for investigating the reaction chemistry of iron-sulfur clusters is described: [MFe3S4] cluster cubanes are prepared varying the identity of the heterometal (Mo or V) and the steric profile of its supporting ligand for application in studies of dinitrogen binding and functionalization. The discovery of a new tridentate ligand topology for cuboidal [Fe4S4] clusters incorporating 1,1'-biphenyl-3,3'-diyl linkers is reported, along with strategies for metalating its tris(phosphine) derivative.
Download or read book Biomimetic Function of Iron Sulfur Clusters with Alternative Ligands written by Marie Bergner and published by Cuvillier Verlag. This book was released on 2017-12-07 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Iron sulfur clusters are essential cofactors involved in electron transfer, sensing, and catalysis in all three kingdoms of life. While most iron sulfur clusters are ligated by cysteine thiolates, a number of clusters featuring so called alternative ligands such as histidine have been recognized in recent years. This work uses synthetic [2Fe-2S] analogues to explore the role alternative ligands play in determining the reactivity of iron sulfur clusters. Isomerization in a homoleptically coordinated cluster utilizing a mixed nitrogen- and sulfur-donating ligand is investigated as a model for ligand rearrangement processes during iron sulfur cluster biogenesis. Furthermore, a high fidelity model system for the asymmetrically ligated [2Fe-2S] cluster of mitoNEET proteins is developed and characterized in detail. This cluster and its homoleptic analogue are studied as reagents in proton coupled electron transfer processes, highlighting the role asymmetry and reorganization energy play in tuning this reactivity. The effects of the ligation pattern on entropic contributions during reduction are probed by temperature dependent electrochemical measurements. Finally, synthetic [2Fe-2S] clusters are investigated with respect to their reactivity with organic radicals, mimicking the unique reactivity of biotin synthase.
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 Synthesis Structure and Bonding of New Types of Iron and Cobalt Nitrosyl Clusters Containing Tri Tetra and Pentacoordinated Sulfur And or Nitrogen Atoms written by Cynthia Ting-Wah Chu and published by . This book was released on 1977 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Structural bonding electrochemical Investigation of Redoxable Iron and Cobalt Sulfide Clusters written by Curtis Richard Pulliam and published by . This book was released on 1986 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis Structure and Bonding of New Types of Iron and Cobalt Nitrosyl Clusters Containing Tri Tetra and Pentacoordinated Sulfur And or Nitrogen Atoms written by Cynthia Ting-Wa Chu and published by . This book was released on 1977 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metalloproteins written by Yilin Hu and published by Humana Press. This book was released on 2018-10-31 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides an up-to-date, in-depth overview of the methods that have been applied to studying the complex metalloproteins at a molecular level. Chapters cover a wide range of approaches focusing on genetic, biochemical, spectroscopic, chemical methods, and theoretical calculations. 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. Authoritative and cutting-edge, Metalloproteins: Methods and Protocols aims to be useful for anyone who is interested in metalloprotein research and wants to address the unanswered mechanistic and biosynthetic questions of these fascinating enzyme systems.
Download or read book Synthesis and Stereochemical Investigation of the Redox active Iron chalcogenide Nitrosyl Clusters written by Cheuk-Ki Ma and published by . This book was released on 1992 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Nitrogen Fixation and its Research in China written by Guo-Fan Hong and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen Fixation by symbiotic organisms is considered an important contribution to the solution of food problems throughout the world. For manyyears, Chinese scientists have focused their research in this area. Today more than half of the total nitrogen fertilizers applied are from biological fixation sources. The editor is an international renowned scientist at the Chinese Academy of sciences. He has brought together contributions from various research fields in China and Europe.Together they present the state-of-the-art in nitrogen-fixation research. The studies range from actino- mycete fixation induced in various genera andspecies of plants, mechanisms and chemical modeling of enzyme systems togenetical engineering of organisms.
Download or read book Kinetic Studies on Synthetic and Biological Iron sulfur Based Clusters written by Adrian John Dunford and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bioinorganic Catalysis written by Jan Reedijk and published by CRC Press. This book was released on 1999-02-02 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Provides the latest research results and suggests new topics for interdisciplinary study of metal ions, catalysis, and biochemical systems. Second Edition highlights potential applications; includes new chapters on zinc and FeS clusters; presents new X-ray analysis of metalloenzymes; and more."
Download or read book Journal of Research of the National Institute of Standards and Technology written by and published by . This book was released on 1991-10 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrogen Fixation written by Yoshiaki Nishibayashi and published by Springer. This book was released on 2017-06-19 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a review of recent developments in nitrogen fixation using transition metal–dinitrogen complexes in the last decade. The authors are international experts in the corresponding field and each chapter discusses their latest achievements in the preparation of various transition metal–dinitrogen complexes and their reactivity. This volume will be helpful to researchers, teachers, and students who are interested in innovative and sustainable chemistry.
Download or read book Kinetic Studies on Synthetic and Biological Iron sulfur Based Clusters written by Adrian John Dunford and published by . This book was released on 2002 with total page 251 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectroscopic Studies of Biological Synthetic Tetranuclear Iron sulfur Clusters written by Yvonne Amalia Oñate and published by . This book was released on 1989 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Structural Perspective on Respiratory Complex I written by Leonid Sazanov and published by Springer Science & Business Media. This book was released on 2012-05-11 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book contains chapters written by leaders in the research on the structure and function of respiratory complex I. It will provide a concise and authoritative summary of the current knowledge on complex I of respiratory chains. This enzyme is central to energy metabolism and is implicated in many human neurodegenerative diseases, as well as in aging. Until recently it was poorly understood on a structural level, and this book will provide a timely reference resource. Such a book was not published previously. The last time a minireview series on complex I were published was in 2001, and since then complex I field changed quite dramatically.
