Download or read book Preparation and Magnetic Properties of Some Mono and Polynuclear Iron III and Chromium III Complexes written by Paul Leonard Beaumont and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Synthesis Characterization and Magnetic Properties of Some Iron III Tridetonates written by William Davis Vanderbout and published by . This book was released on 1977 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Part I The Crystal Structure of Tris 1 3 Propanedionato Chromium III written by M. Bernice Andrelczyk and published by . This book was released on 1972 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal Pyrrolide Complexes in Three fold Symmetry written by William Hill Harman and published by . This book was released on 2010 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given the prominence of six-coordinate pseudo-octahedral complexes in transition metal chemistry, lower coordinate complexes in tetrahedral, trigonal pyramidal and trigonal bipyramidal configurations have garnered increased interest due to the changes in electronic structure and reactivity resultant from three-fold symmetry relative to the four-fold symmetry commonly observed in their pseudo-octahedral counterparts. Herein, we report a range of such effects in a collection of transition metal complexes supported by chelating, trianionic trispyrrolide ligands [tpaR]3-. In chapter one, two trigonal pyramidal iron(II) complexes, [(tpaPh)Fe]- and [(tpaMes)Fe]-, are discussed which are capable of undergoing oxygen atom transfer reactions and subsequent activation of strong C-H bonds. Additionally, the mesityl derivative is capable of oxygen atom transfer from nitrous oxide, an attractive but notoriously unreactive molecule. In chapter two, this family of iron(II) complexes is expanded to include tert-butyl, 2,4,6-triisopropylphenyl and 2,6-difluorophenyl substituted variants, and the magnetic properties of this homologous series of trigonal pyramidal iron(II) complexes are explored. Notably, a number of these complexes exhibit frequency dependent signals at low temperature in the imaginary component of ac magnetic susceptibility measurements performed in the presence of a small applied field. Further exploration of this behavior via magnetometry, high-field EPR and Mössbauer spectroscopy reveal a large barrier to magnetic relaxation in these complexes, in some cases comparable to the best known single molecule magnets. This phenomenon is accounted for by the unquenched orbital angular momentum present in a three-fold symmetric high spin d6 system, leading to significant uniaxial anisotropy and a barrier to spin inversion. Progress towards a magneto-structural analysis of this behavior is made for this series. Chapter three contains a through treatment of the coordination, redox and group transfer chemistry of the iron(II) platform [(tpaMes)Fe]-. In particular, it is shown that this complex is capable of supporting both high and low spin five coordinate adducts, including a rare example of a paramagnetic carbonyl complex of iron(II), [(tpaMes)Fe(CO)]-. Furthermore, the redox chemistry of this system is illustrated in the synthesis of the neutral iron(III) complex (tpaMes)Fe(i-PrNH2). As an extensiont to the oxygen atom chemistry presented in chapter one, nitrene group transfer to [(tpaMes)Fe]- is described, resulting in the synthesis of an iron(III) amido complex. The identity of this species is confirmed by high resolution electrospray mass spectrometry as well as Mössbauer, x-ray absorption and EPR spectroscopies. In chapter four, the vanadium chemistry of [tpaR]3- is introduced. In particular, the vanadium(III) complex (tpaMes)V(THF) is show to react with an aryl azide to yield an isolable vanadium(V) diazenylimido species, a member of a very rare structural type. This complex is shown to decompose unimolecularly by dinitrogen loss to generate the cooresponding vanadium(V) imido. In addition to the vanadium-nitrogen multiple bond chemistry described, the synthesis two pseudo-three-fold symmetric vanadium(IV) oxo species is discussed. Single crystal x-ray structures of both complexes reveal a distorted coordination geometry and a short vanadium-oxo distance, consistent with a triple bond. The oxidation of both of these complexes to the corresponding vanadium(V) oxo is performed and shown by x-ray crystallography to result in the relief of the distortion observed in the vanadium(IV) oxo complexes. Taken together, these results shed light on the nature of metal ligand multiple bonding in three-fold symmetric geometries. Chapter five discusses the chromium complexes of [tpaMes]3-, in particular the group transfer and redox chemistry of the system. Both chromium(II) and chromium(III) complexes are available by direct metallation, and the chromium(II) complex [(tpaMes)Cr(DME)]- is shown to undergo both oxygen atom and nitrene group transfer reactions to yield chromium(IV) oxo and imido complexes respectively. The chromium(IV) imido complex exhibits rich redox chemistry, and its oxidation to the isostructural chromium(V) and chromium(VI) complexes are demonstrated.

Download or read book Synthesis Characterisation and Reactivity of Mono and Poly nuclear Iron III Complexes written by Philip Daniels and published by . This book was released on 1997 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Magnetic Properties of Mono and Dinuclear Spin crossover Compounds of Iron II written by Benjamin Aldo Leita and published by . This book was released on 2006 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index to Theses Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 1974 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis Structure and Magnetic Properties of the Binunclear Chromium III Complex Di Hydroxobis 1 4 7 10 tetraazacyclododecane Chromium III Dithionate Tetrahydrate cyclen CrOH 2 S2O6 2 4H20 written by Erik Pedersen and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 1 Synthesis and Reactivity of Paramagnetic Chromium III Alkyl Dimers 2 Magnetic Susceptibility Studies of Mono Di and Trinuclear Organometallic Complexes written by Darrin Scott Richeson and published by . This book was released on 1989 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Mass Spectroscopy Literature for 1970 written by and published by . This book was released on 1972 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Electronic and Magnetic Properties of Some Chromium II and Chromium III Compelxes written by Patrick B. Lutz and published by . This book was released on 1970 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quarterly Journal of the Chemical Society of London written by Chemical Society (Great Britain) and published by . This book was released on 1970 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structural and Magnetic Properties of Some Mono and Polynuclear Transition metal Schiff base Complexes written by Thitinant Thanyasiri and published by . This book was released on 1988 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index to American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies of Iron III Model Complexes Exhibiting Unusual Magnetic Properties written by Alphonse F. Semendy and published by . This book was released on 1982 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Conference Papers Index written by and published by . This book was released on 1979 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monthly. Papers presented at recent meeting held all over the world by scientific, technical, engineering and medical groups. Sources are meeting programs and abstract publications, as well as questionnaires. Arranged under 17 subject sections, 7 of direct interest to the life scientist. Full programs of meetings listed under sections. Entry gives citation number, paper title, name, mailing address, and any ordering number assigned. Quarterly and annual indexes to subjects, authors, and programs (not available in monthly issues).

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: