Download or read book Magnetic Spectral and Structural Studies of Some High spin Cobalt II Complexes written by Roger Hamilton Soderberg and published by . This book was released on 1963 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inorganic Syntheses written by Philip P. Power and published by John Wiley & Sons. This book was released on 2018-07-04 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The newest volume in the authoritative Inorganic Syntheses book series provides users of inorganic substances with detailed and foolproof procedures for the preparation of important and timely inorganic and organometallic compounds that can be used in reactions to develop new materials, drug targets, and bio-inspired chemical entities.
Download or read book Abstracts of Theses Accepted in Partial Fulfillment of the Requirements for the Doctor s Degree written by Massachusetts Institute of Technology and published by . This book was released on 1964 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Synthesis Characterization and Electronic Properties of Some Alkylaminofluorophosphine Complexes of Cobalt II Halides written by Thomas Edward Nowlin and published by . This book was released on 1971 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis and Characterization of Low Coordinate Transition Metal Complexes written by Aimee M. Bryan and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes the synthesis, characterization, and reactivity studies of new low-coordinate complexes of readily available and inexpensive transition metals such as iron, cobalt and nickel. The compounds were magnetically characterized in detail and tested for single molecule magnet (SMM) behavior. SMMs are a topic of intense research because of their potential applications in magnetic memory, high-density information storage and quantum computing technologies. Low-coordinate compounds display magnetic moments that indicate high orbital angular momentum and are very promising candidates for SMM behavior because they also tend to have large negative zero-field splitting (D) values. The complexes reported here are stabilized by using a variety of amido, aryloxo and thiolato ligands with bulky terphenyl groups and also using aryl and alkyl substituted silylamides. A superconducting quantum interference device (SQUID) and Evans' methods were used to study the magnetic properties and single crystal X-ray crystallography and NMR (1H and 13C) were used to confirm the structures of these compounds in both the solid and solution states. Further characterization studies included UV-visible, near-IR, and IR spectroscopy, melting point, elemental analysis and DFT calculations, where applicable, in order to determine the electronic configurations and bonding schemes. At present there are ca. 100 stable open shell two-coordinate mononuclear transition metal complexes currently known but ca. 20% have a linear coordination at the metal atom with only a few being strictly 180° at their metal center. Very few of these compounds had been magnetically characterized. In Chapter 2, the synthesis and magnetic characterization of the late transition metal Co2+ (d7) and Ni2+ (d8) primary amido complexes Co{N(H)Ar(iPr6)}2, Co{N(H)Ar(Me6)}2, Ni{N(H)Ar(iPr6)}2 and Ni{N(H)Ar(Me6)}2 (Ar(Me6) = C6H3-2,6(C6H2-2,4,6-Me3)2, Ar(iPr6) = C6H3-2,6(C6H2-2,4,6-(i)Pr3)2) are described. The investigations showed that they exhibit interesting magnetic behavior. The bent versus linear geometries of the complexes enable direct observation of the effects of orbital angular momentum quenching upon bending the metal coordination geometry. The electronic configuration of the linear cobalt(II) complexes does not predict first order orbital angular momentum and yet, the magnetic moment of Co{N(H)Ar(iPr6))2 is much higher than the spin only value which suggests a large spin-orbit coupling effects due to mixing of the ground and excited states. In Chapter 3, the synthesis and characterization of the mononuclear chromium, iron, cobalt and nickel terphenyl substituted thiolate complexes Cr(SAr(Me6))2, Cr(SAr(iPr4))2, Fe(SAr(iPr4))2, Co(SAr(iPr4))2 and Ni(SAr(iPr4))2 are described. Their structures show bent coordination geometries of varying degree with strong secondary M-[eta]6 and M-C(ipso) flanking aryl ring interactions of ca. 2.153 [Angstrom] for Fe(SAr(iPr4))2, ca. 1.625 [Angstrom] for Co(SAr(iPr4))2 and ca. 1.731 [Angstrom] for Ni(SAr(iPr4))2. This observation is in sharp contrast to the almost linear coordination observed for the derivatives of the related but more crowded terphenyl thiolate ligand, SAr(iPr6), in M(SAr(iPr6))2 complexes where M = Cr, Fe, Co and Ni and the strictly linear geometry observed for the terphenyloxo analogs M(OAr(iPr4))2 where M = Fe and Co. Magnetic moments for these species are, in general, lower than the spin-only values. Expect for chromium, this is an unexpected observation for late transition metal low-coordinate complexes. The suppression of magnetic moments is most like due to the strong M-arene interactions which effectively increases the coordination number at the metal atom. These results demonstrate the important role that substituents play on the flanking rings of the terphenyl ligands and begs further investigations involving the role of dispersion in the isolation of low coordination mononuclear transition metal complexes. The divalent silylamides M{N(SiMe3)2}2 (M = Mn, Fe, and Co) are key synthons for low-coordinate transition-metal derivatives. In Chapter 4, the previously reported, but incorrectly characterized cobalt(II) silylamide, [Co{N(SiMe3)2}2]2 has been spectroscopically and magnetically characterized for the first time. In addition, the new Lewis base complexes [Co{N(SiMe3)2}2(PMe3)], and [Co{N(SiMe3)2}2(THF)], as well as a previously reported complex [Co{N(SiMe3)2}2(py)] were isolated and characterized. Magnetic studies showed that they had considerably larger magnetic moments than the spin-only value of 3.87 [mu](B), which is indicative of a significant zero-field splitting and g-tensor anisotropy. In addition to their interesting magnetic behavior and unexpectedly large D values in the range of -20 to -80 cm−1. The electronic spectrum of [Co{N(SiMe3)2}2]2 in solution showed that earlier characterization spectra of "Co{N(SiMe3)2}2" match that of the bright green THF adduct and not the dark brown cobalt dimer [Co{N(SiMe3)2}2]2. In Chapter 5, it is shown that the reaction of the versatile cobalt(II) amide, [Co{N(SiMe3)2}2]2, with four equivalents of the sterically crowded terphenyl phenols, HOAr(Me6) and HOAr(iPr4) (Ar(iPr4) = C6H3-2,6(C6H3-2,6-(i)Pr2)2) produced the first well-characterized, monomeric two-coordinate cobalt(II) bisaryloxides, Co{OAr(Me6))2 and Co(OAr(iPr4))2. Not only are these very rare examples of two-coordinate transition metal(II) aryloxides, but the magnetic moments of both the linear and the bent species were well in excess of the spin only value for cobalt(II) ion. It was demonstrated that careful manipulation of the synthetic conditions for Co(OAr(iPr4))2 could produce varying occupancies of the cobalt(II) site and that after weighting the magnetic susceptibilities of the compounds accordingly, the moments were shown to be in close agreement with each other. Chapter 6 reports the synthesis of the unstable nickel(II) bis(silylamide) complex Ni{N(SiMe3)2}2 via the reaction of NiI2 and two equivalents of NaN(SiMe3)2 in tetrahydrofuran, as well as two of its Lewis base adducts, Ni{N(SiMe3)2}2(THF) and Ni{N(SiMe3)2}2(py)2. The reaction of two equivalents of LiN(SiMe3)2 with NiCl2(DME) in tetrahydrofuran afforded the reduced homoleptic tetrameric nickel(I) amide complex, [Ni{N(SiMe3)2}]4. This unique polymetallic structure having a Ni4N4 planar array has four S = 1/2 nickel (I) ions and an antiferromagnetic exchange coupling constant of J = -102(2) cm−1. This study provides strong evidence that the formation of nickel(II) and nickel(I) amido complexes is possible without the use of sterically demanding ligand sets.
Download or read book OAR Cumulative Index of Research Results written by and published by . This book was released on 1967 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1979 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Future Directions in Metalloprotein and Metalloenzyme Research written by Graeme Hanson and published by Springer. This book was released on 2017-08-11 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the latest developments in metalloenzymes, including characterizing metal bridging in proteins and peptides, copper(II) complexes of marine peptides, high-spin Co(II) in model and metalloprotein systems to enzymes such as the molybdenum-containing enzymes, CW and pulse EPR of cytochrome P450 enzymes and the radical S-adenosylmethionine FeS family. In the previous two related volumes in the Biological Magnetic Resonance series, High-Resolution EPR: Applications to Metalloenzymes and Metals in Medicine and Metals in Biology:Applications of High-Resolution EPR to Metalloenzymes, topics covered included high-resolution EPR methods, iron proteins, nickel and copper enzymes, metals in medicine, iron–sulfur cluster-containing proteins, and molybdenum enzymes. In this volume, new developments in these areas are covered in detail and new areas that have emerged are also detailed. This is an ideal book for graduate students and researchers working in the fie lds of high-resolution EPR, metalloenzymes, and metals in biology.
Download or read book My Life in the Golden Age of Chemistry written by F. Albert Cotton and published by Elsevier. This book was released on 2014-08-19 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: A giant in the field and at times a polarizing figure, F. Albert Cotton’s contributions to inorganic chemistry and the area of transitions metals are substantial and undeniable. In his own words, My Life in the Golden Age of Chemistry: More Fun than Fun describes the late chemist’s early life and college years in Philadelphia, his graduate training and research contributions at Harvard with Geoffrey Wilkinson, and his academic career from becoming the youngest ever full professor at MIT (aged 31) to his extensive time at Texas A&M. Professor Cotton’s autobiography offers his unique perspective on the advances he and his contemporaries achieved through one of the most prolific times in modern inorganic chemistry, in research on the then-emerging field of organometallic chemistry, metallocenes, multiple bonding between transition metal atoms, NMR and ESR spectroscopy, hapticity, and more. Working during a time of generous government funding of science and strong sponsorship for good research, Professor Cotton’s experience and observations provide insight into this prolific and exciting period of chemistry. Offers personal and often wry perspective from this prominent chemist and recipient of some of science’s highest honors: the U.S. National Medal of Science (1982), the Priestley Medal (the American Chemical Society's highest recognition, 1998), membership in the U. S. National Academy of Sciences and corresponding international bodies, and 29 honorary doctorates Details the background behind the development and emergence of groundbreaking research in organometallic chemistry and transition metals Provides beautifully-written and engaging insight into a "Golden Age of Chemistry" and the work of historically renowned chemists
Download or read book Polyoxometalate Chemistry From Topology via Self Assembly to Applications written by M.T. Pope and published by Springer Science & Business Media. This book was released on 2001-06-30 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polyoxometalates constitute an extensive class of compounds with an unmatched range of structures, properties and applications. This is an authoritative, up-to-date summary of the chemistry and applications of polyoxometalates.
Download or read book The Porphyrin Handbook Volume 5 written by Karl Kadish and published by Academic Press. This book was released on 1999-10-15 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists in such fields as mathematics, physics, chemistry, biochemistry, biology, and medicine are currently involved in investigations of porphyrins and their numerous analogues and derivatives. Porphyrins are being used as platforms for the study of theoretical principles, as catalysts, as drugs, as electronic devices, and as spectroscopic probes in biology and medicine. The need for an up-to-date and authoritative treatise on the porphyrin system has met with universal acclaim amongst scientists and investigators.
Download or read book Issues in Chemistry and General Chemical Research 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 6582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Chemistry and General Chemical Research: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Chemistry and General Chemical Research. The editors have built Issues in Chemistry and General Chemical Research: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Chemistry and General Chemical Research in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Chemistry and General Chemical Research: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Research and Development in Progress written by and published by . This book was released on 1973 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1984 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1970 with total page 1338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inorganic Chemistry of the Transition Elements written by B F G Johnson and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 80 years the Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued. The current list of Specialist Periodical Reports can be seen on the inside flap of this volume.
Download or read book Chemical and Structural Studies of Some Organo cobalt and nickel Complexes written by Vernon Albert Uchtman and published by . This book was released on 1968 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
