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Neutron Diffraction Studies Of Transition Metal Hydrides And Chemistry Of Metal Hydride Clusters
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Book Synopsis Neutron Diffraction Studies of Transition Metal Hydrides and Chemistry of Metal Hydride Clusters by : Mary Helen Drabnis
Download or read book Neutron Diffraction Studies of Transition Metal Hydrides and Chemistry of Metal Hydride Clusters written by Mary Helen Drabnis and published by . This book was released on 1997 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Diffraction Studies of Tetrahedral Cluster Transition Metal Hydride Complexes by :
Download or read book Neutron Diffraction Studies of Tetrahedral Cluster Transition Metal Hydride Complexes written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Structures of the tetrahedral cluster transition metal hydride complexes HFeCo/sub 3/(CO)/sub 9/(P(OCH/sub 3/)/sub 3/)/sub 3/ and H/sub 3/Ni/sub 4/(C/sub 5/H/sub 5/)/sub 4/ have been investigated by low-temperature neutron diffraction techniques. Both complexes have approximate C/sub 3//sub v/ symmetry. In HFeCo/sub 3/(CO)/sub 9/(P(OMe)/sub 3/)/sub 3/ the hydride ligand is found outside the FeCo/sub 3/ cluster, 0.978(3) A from the Co/sub 3/ face, and essentially on the molecular three-fold axis, triply bridging the cobalt atoms. Mean distances in the cluster are Co-Co 2.489(7), Co-Fe 2.559(2), Co-H 1.734(4) A. In H/sub 3/Ni/sub 4/(Cp)/sub 4/ the three hydride ligands are face-bridging, and their mean displacement from the faces of the cluster is 0.90(3) A. The H/sub 3/Ni/sub 4/ core may be envisaged as a distorted cube, with one vertex unoccupied. Mean distances are Ni-Ni 2.469(6), Ni-H 1.691(8), H ... H 2.316(6) A. The observed geometries of the two clusters considered here suggest a plausible model for chemisorption of hydrogen on (111) faces of cubic and (001) faces of hexagonal close-packed metals, in which hydrogen atoms are located approximately 1 A above the centers of triangles of metal atoms.
Book Synopsis Neutron Diffraction Studies on Transition Metal Hydride Complexes by :
Download or read book Neutron Diffraction Studies on Transition Metal Hydride Complexes written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent neutron diffraction investigations on terminal, bridging and triply-bridging metal-hydrogen bonds are reviewed.
Book Synopsis Neutron Diffraction Studies of Transition Metal Hydride Complexes. [Complexes with C5H6, CO, NO, P(OCH3)3]. by :
Download or read book Neutron Diffraction Studies of Transition Metal Hydride Complexes. [Complexes with C5H6, CO, NO, P(OCH3)3]. written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigations of H3Ta(C5H5)2 (III), HW2(CO)9(NO) (IV), and HW2(CO)(NO) (P(OCH3)3) (V) have been completed. Preliminary results are available for HFeCo3(CO)9(P(OCH3)3)3 (VII). This work, together with studies of HMo2(C5H5)2(CO)4(P(CH3)2) (VI) and ((C2H5)4N) (HCr2(CO)10)− carried out at Argonne has led to some general observations on the geometry and the nature of bonding in these compounds. For example, in the structures of IV and V, both of which have bent W--H--W linkages (less than W--H--W in the range 125-130°), there is conclusive evidence for the existence of a closed three-center W--H--W bond with significant metal-metal interaction. Such is the case, because extensions of the axial W--C and W--N bonds trans to the hydride intersect at a point near the center of the W--H--W triangle. The geometry of VI, which also contains a bent M--H--M bond, is consistent with that of IV and V. Bridging M--H bonds in these second- and third-row hydrides range in length from 1.85 to 1.89 A, compared to 1.75 A in the first-row polynuclear complex VII. For metals of corresponding rows, bridging M--H bonds are about 0.1 A longer than terminal bonds, which are classified as single covalent bonds.
Book Synopsis Neutron Diffraction Studies of Transition Metal Hydrides by : Nam Nhat Ho
Download or read book Neutron Diffraction Studies of Transition Metal Hydrides written by Nam Nhat Ho and published by . This book was released on 2003 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transition Metal Hydrides by : Robert Bau
Download or read book Transition Metal Hydrides written by Robert Bau and published by Washington : American Chemical Society. This book was released on 1978 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Diffraction Studies of Transition Metal Binary Alloys by : Leonard Gordon Feinstein
Download or read book Neutron Diffraction Studies of Transition Metal Binary Alloys written by Leonard Gordon Feinstein and published by . This book was released on 1962 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Diffraction Studies of Metal Hydride Complexes by : Muhammed Faiz Yousufuddin
Download or read book Neutron Diffraction Studies of Metal Hydride Complexes written by Muhammed Faiz Yousufuddin and published by . This book was released on 2005 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Diffraction Analysis of Transition Metal Hydrides by : Raymond Charles Stevens
Download or read book Neutron Diffraction Analysis of Transition Metal Hydrides written by Raymond Charles Stevens and published by . This book was released on 1988 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Diffraction Studies on Transition Metal Compounds by : Carlos E. Infante-Barros
Download or read book Neutron Diffraction Studies on Transition Metal Compounds written by Carlos E. Infante-Barros and published by . This book was released on 1975 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Single Crystal Neutron Diffraction from Molecular Materials by : Chick C. Wilson
Download or read book Single Crystal Neutron Diffraction from Molecular Materials written by Chick C. Wilson and published by World Scientific. This book was released on 2000 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important book presents a comprehensive account of the techniques & applications of single crystal neutron diffraction in the area of chemical crystallography & molecular structure. Beginning with a brief description of the general principles & the reasons for choosing the technique - the "why" - the book covers the methods for both the production of neutrons & the measurement of their scattering by molecular crystals - the "how" - followed by a detailed survey of past, present & future applications - the "what". The coverage of both steady state & pulsed neutron sources & instrumentation is extensive, while the survey of applications is the most comprehensive yet undertaken. The book endeavours to show why the technique is an essential method for studying areas as diverse as hydrogen bonding & weak interactions, organometallics, supramolecular chemistry & crystal engineering, metal hydrides, charge density & pharmaceuticals. It is an ideal reference source for the research worker interested in using neutron diffraction to study the structure of molecules. Contents: Crystallography & the Importance of Structural Information; Neutron Scattering; Neutron Diffractometers; Review of Applications I: The Accurate Location of Atoms; Review of Applications II: Hydrogen Bonding & Other Intermolecular Interactions; Review of Applications III: Probing Vibrations & Disorder; Impact on Material Properties & Design; The Future: New Instruments, New Sources, New Techniques. Readership: Students & researchers involved in structural science, especially chemical crystallography.
Book Synopsis Neutron Diffraction Studies of Some Rare Earth-Transition Metal Deuterides by : William J. James
Download or read book Neutron Diffraction Studies of Some Rare Earth-Transition Metal Deuterides written by William J. James and published by . This book was released on 1986 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron diffraction experiments were performed on Ho6Mn23. At 77K it is found to have a face-centered cubic crystal structure and a non-collinear magnetic structure, with the Ho moments tilted at an angle of 33.4 to the Mn moments. The Ho atom carries a moment of 3.8 mu sub B, while the Mn moments at the b, d, f sub 1 and f sub 2 sites are 2.1, 2.0, 2.2 and 1.9 mu sub B respectively, comparable to those found in Y6Mn23. The very low moment on the Ho atom is rationalized as resulting from the fanning of the weakly coupled rare earth moments around the net Ho moment direction, giving a low spatially averaged value. Neutron diffraction studies of three Y6(Fe1-xAlx)23 compounds (x=0.05, 0.10, 0.15) at 523K and 77K reveal substantial preferential atomic ordering of Fe and Al atoms on the four transition crystallographic sites. The Fe atoms exhibit different magnetic moments on the four sites. The ternary alloys, Y6(FexMn1-x)23, exhibit interesting magnetic behavior over a range of solid solutions of iron and manganese. The effects of the substitution of Fe by Al in the R2 (Fe1-xAlx)14B compounds (R = Y, rare earths) on their magnetic properties have been investigated. The present experimental data indicate that intermetallic compounds based on Nd2(Fe1-x-yAlxCoy)14B have both high Curie temperatures and high coercive fields. The magnetocrystalline anisotropy of (Nd1-xSmx)2Fe14B and (Nd1-xPrx)2Fe14B has been studied by X-ray and magnetic measurements. Keywords: Rare earth-transition metal alloys and hydrides; Permanent magnets; Sublattices.
Book Synopsis Catalytic Transition Metal Hydrides by : Donald Warren Slocum
Download or read book Catalytic Transition Metal Hydrides written by Donald Warren Slocum and published by . This book was released on 1983 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron and X-Ray Diffraction Studies on Nonstoichiometric Metal Hydrides by :
Download or read book Neutron and X-Ray Diffraction Studies on Nonstoichiometric Metal Hydrides written by and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A diffraction study using neutrons and x rays was made of metal hydride systems in which the metal-rich regions are emphasized. The composition range used was 2 to 66.5 at.% H/sub 2/ in Hf, Ti, and Zr; and a system consisting of 62 at.% Ti and 38 at.% Zr. The samples studied were in the form of deuterides, Results of the investigation show that the Zr--D system has alpha, gamma, sigma, and epsilon phases as in the H systems. Differences between the Zr--H and Zr-- D systems are discussed. (J.R.D.).
Download or read book Energy Research Abstracts written by and published by . This book was released on 1986 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annals of the New York Academy of Sciences by : Thomas Lincoln Casey
Download or read book Annals of the New York Academy of Sciences written by Thomas Lincoln Casey and published by . This book was released on 1983 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Records of meetings 1808-1916 in v. 11-27.
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1997 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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