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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.
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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.
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.
Author : Mary Helen Drabnis
Publisher :
ISBN 13 :
Total Pages : 362 pages
Book Rating : 4.:/5 (44 download)
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:
Author : Nam Nhat Ho
Publisher :
ISBN 13 :
Total Pages : 364 pages
Book Rating : 4.:/5 (56 download)
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:
Author : Muhammed Faiz Yousufuddin
Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.:/5 (77 download)
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:
Author : Chick C Wilson
Publisher : World Scientific Publishing Company
ISBN 13 : 9813105402
Total Pages : 386 pages
Book Rating : 4.8/5 (131 download)
Download or read book Single Crystal Neutron Diffraction From Molecular Materials written by Chick C Wilson and published by World Scientific Publishing Company. This book was released on 2000-02-18 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important book presents a comprehensive account of the techniques and applications of single crystal neutron diffraction in the area of chemical crystallography and molecular structure. Beginning with a brief description of the general principles and the reasons for choosing the technique — the “why” — the book covers the methods for both the production of neutrons and the measurement of their scattering by molecular crystals — the “how” — followed by a detailed survey of past, present and future applications — the “what”. The coverage of both steady state and pulsed neutron sources and 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 and weak interactions, organometallics, supramolecular chemistry and crystal engineering, metal hydrides, charge density and pharmaceuticals. It is an ideal reference source for the research worker interested in using neutron diffraction to study the structure of molecules.
Author : Maurizio Peruzzini
Publisher : Elsevier
ISBN 13 : 0080540333
Total Pages : 577 pages
Book Rating : 4.0/5 (85 download)
Download or read book Recent Advances in Hydride Chemistry written by Maurizio Peruzzini and published by Elsevier. This book was released on 2002-01-30 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has been conceived to collect the most important recent advances in all areas of hydride chemistry research, including chemical reactivity, instrumental investigation, theory, and applications in the areas of catalysis, biochemistry and materials science. Many of the chapters have been written by the plenary lecturers of the EURO-Hydrides 2000 conference, but other leading scientists in this field have also been invited to contribute. The first part of the book focuses on the chemistry and catalysis of transition metal hydrides. Another block of chapters illustrates the most recent advances in the application of instrumental techniques to the study of the properties and reactivity of hydride compounds. The final part of the book illustrates the relevance of metal-hydrogen bonds in biochemistry and materials science. All of the chapters of this book have been evaluated by independent reviewers.
Author : Carlos E. Infante-Barros
Publisher :
ISBN 13 :
Total Pages : 698 pages
Book Rating : 4.:/5 (989 download)
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:
Author : Leonard Gordon Feinstein
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (331 download)
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:
Author : United States. Energy Research and Development Administration
Publisher :
ISBN 13 :
Total Pages : 716 pages
Book Rating : 4.0/5 ( download)
Download or read book ERDA Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William J. James
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (227 download)
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.
Author : United States. Energy Research and Development Administration
Publisher :
ISBN 13 :
Total Pages : 1314 pages
Book Rating : 4.3/5 (91 download)
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 1314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. Energy Research and Development Administration. Technical Information Center
Publisher :
ISBN 13 :
Total Pages : 788 pages
Book Rating : 4.3/5 (129 download)
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 1044 pages
Book Rating : 4.3/5 (129 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Raymond Charles Stevens
Publisher :
ISBN 13 :
Total Pages : 430 pages
Book Rating : 4.:/5 (499 download)
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:
Author : R. M. Moon
Publisher :
ISBN 13 :
Total Pages : 604 pages
Book Rating : 4.3/5 (91 download)
Download or read book Proceedings of the Conference on Neutron Scattering written by R. M. Moon and published by . This book was released on 1976 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
