X-ray Structural Studies of Some Group VIII Compounds with Catalytic Implications PDF Download
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Languages : en
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Languages : en
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Author: Douglas Allen Sullivan
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 474
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X-ray structural investigations of compounds containing Group VIII metal atoms are presented. The compounds studied illustrate interatomic interactions which may be of importance in catalytic processes. The structures of metal-containing compounds were solved by locating the heavy atoms in Patterson functions and locating the remaining atoms in Fourier syntheses. The direct method of symbolic addition was used in the one, all light-atom case presented. Trial structures were refined by the method of least-squares. The crystal structure of trans -chloro (dimethylglyoximato) (dimethylglyoxime) (4-chloroaniline) cobalt (III) illustrates an unusual ligand-induced proton shift. Both neutral and dianionic dimethylglyoxime groups are found in the complex and the 4-chloroaniline ligand is oriented over the dianionic dimethylglyoxime. The structure of trans-bis (dimethylxiglyoximato) bis (4-chloroaniline) cobalt (III) chloride shows that complex to contain two monoatomic dimethylglyoxime ligands and the 4-chloroaniline ligands to be skewed relative to the diglyoxime ligands. The crystal structure of trans-chlorobis (diphenylglyoximato) {4-chloroaniline) cobalt- (III) is described. Trends in the structures of these compounds and in the previously reported structures of similar compounds are discussed. Ultraviolet and infrared spectra of these compounds are given. The synthesis of a novel chelating ligand capable of binding two metal ions is described. The characterizations, including crystal structures, of its protonated forin, 1,4-dihydrazinophthalazinebis (2-pyridiniuracarboxaldimine) nitrate dihydrate, and of a nickel complex, y-chlorotetraaqua .,4- dihydrazinophthalazinebis (2-pyridinecarboxaldimine) dinickel- (II) chloride dihydrate, are presented. The planar ligand is shown to bind tv/o nickel ions with a separation of 3. COS o (1) A.A chloride ion occupies a bridging site in the plane of the nickel atoms and the ligand. The magnetic moment per nickel atom of the chloride bridged complex was deteinnined to be 2.74 B.M. at 40°C. The plausibility of structurally similar complexes mimicking the nitrogen-fixing enzyme nitrogenase is also discussed. The X-ray crystal structures of 1- (ir-cyclopentadienyl) - l-triphenylphosphine-2,3,4, 5-tetrakis (pentaf luorophenyl) cobaltole and 1- (Tr-cyclopentadienyl) -1-triphenylphosphine- 2,3, 4, 5-tetrakis (pentaf luorophenyl) rhodole are reported. These compounds are viewed as stabilized intermediates in the catalyzed cyclization of acetylenes. In each case the metal atom forms a metallocyclo by a-bonding to the terminal carbons of a butadiene-like fragment. The ir-bonding in the metallocycle appears to be dclocalized.
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Category : Dissertation abstracts
Languages : en
Pages : 532
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Author: University Microfilms International
Publisher:
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Category : Dissertations, Academic
Languages : en
Pages : 858
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Category : Power resources
Languages : en
Pages : 752
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Author: Jack Yarwood
Publisher: Royal Society of Chemistry
ISBN: 1849732833
Category : Science
Languages : en
Pages : 279
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This series provides an unequalled source of information on an area of chemistry that continues to grow in importance. Divided into sections mainly according to the particular spectroscopic technique used, coverage in each volume includes: NMR (with reference to stereochemistry, dynamic systems, paramagnetic complexes, solid state NMR and Groups 13-18); nuclear quadrupole resonance spectroscopy; vibrational spectroscopy of main group and transition element compounds and coordinated ligands; and electron diffraction. Reflecting the growing volume of published work in the field, researchers will find this an invaluable source of information on current methods and applications.
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Publisher: Elsevier
ISBN: 0080528910
Category : Technology & Engineering
Languages : en
Pages : 809
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This book contains 99 of the papers that were presented at the 6th in the series of Symposia on Characterization of Porous Solids held in Alicante, Spain, May 2002. Written by leading international specialists in the subject, the contributions represent an up-to-date and authoritative account of recent developments around the world in the major methods used to characterize porous solids. The book is a useful work of reference for anyone interested in characterizing porous solids, such as MCM-41 mesoporous materials, pillared clays, etc. Papers on pore structure determination using gas adsorption feature strongly, together with papers on small angle scattering methods, mercury porosimetry, microcalorimetry, scanning probe microscopies, and image analysis.
Author: Marin A. Cato
Publisher: Nova Publishers
ISBN: 9781594548444
Category : Science
Languages : en
Pages : 242
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Organometallic chemistry is based on the reactions and use of a class of compounds (R-M) that contain a covalent bond between carbon and metal. They are prepared either by direct reaction of the metal with an organic compound or by replacement of a metal from another organometallic substance. Research in organometallic chemistry is also conducted in the areas of cluster synthesis, main-group derivatives in unusual oxidation states, organometallic polymers, unstable organometallic compounds and intermediates in matrices, structure determination of organometallic compounds in the solid state [X-ray diffraction] and gaseous states [electron diffraction], and mechanisms of reactions of transient silylenes and related species. In addition to the traditional metals and semimetals, elements such as selenium, lithium and magnesium are considered to form organometallic compounds, e.g. organomagnesium compounds MeMgI, iodo(methyl)magnesium and diethylmagnesium, which are Grignard reagents an organo-lithium compound BuLi butyllithium; Organometallic compounds often find practical use as catalysts, the processing of petroleum products and the production of organic polymers.
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ISBN:
Category : Mass spectrometry
Languages : en
Pages : 900
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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 754
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