X-ray and neutron diffraction studies on .lambda.-hydrido-octacarbonyl(nitrosyl)(trimethyl phosphite)ditungsten. A compound with a slightly asymmetric hydrogen bridge bond

Abstract

The following programs were used on an IBM 360/65 computer: magtape and SCTFT2, data reduction programs by V. W. Day; mimdap, a version of Zalkin's Fourier program fordap; orflse, full-matrix least-squares refinement program, a highly modified version of Martin and Levy's original orfls; orffe, bond length and angles with standard deviations by Busing, Martin, and Levy; orteps, thermal ellipsoid plotting program by C. K. Johnson; prtout, structure factor table program by V. W. Day. (12) D. T.

Positively charged ligands. The synthesis, structure, and bonding of sulfonium ion complexes of transition metals and evidence for a metal-induced acceleration of their dealkylation

“…The metal-carbon distances range from 1.945 (8) Á to 2.054 (7) Á and are similar to those found in W(CO)6, W-C = 2.059 Á. 19 The tungsten-phosphorus distance at 2.525 (1) Á is slightly longer than the tungsten-phosphorus distance of 2.480 (4) Á to the P(OCH3)3 ligand found in the molecule HW2(CO)g(NO)[P(0-CH3)3]. 19 In Illb there is clearly no metal-sulfur bond, W-S = 5.789 (1) Á.…”

“…19 The tungsten-phosphorus distance at 2.525 (1) Á is slightly longer than the tungsten-phosphorus distance of 2.480 (4) Á to the P(OCH3)3 ligand found in the molecule HW2(CO)g(NO)[P(0-CH3)3]. 19 In Illb there is clearly no metal-sulfur bond, W-S = 5.789 (1) Á. The carbon-sulfur distances range from 1.809 (7) to 1.831 (6) Á and are similar to those observed for the coordinated sulfonium ligand in Ila.…”

Molecular models for WH6 under pressure

“…29 To our knowledge, there are very few neutron diffraction studies of W-H complexes, all those reported by Bau, Kirley, Koetzle and coworkers. [30][31][32] Keeping in mind that scattering limitations may distort the W-H distances obtained from crystallographic studies, the ''normal'' bond length between a tungsten metal center and a bridging hydrogen is about 1.85-1.90 A ˚and is comparable to the theoretically estimated bond length between a tungsten metal center and an H 2 ligand cited above.…”

Transition metal hydrides as electron donors. Formation, detection, and dimerization of transient, paramagnetic radical cations from the electrochemical oxidation of tungstenocene hydrides and the crystal structure of the binuclear (Cp2W)2H3+ product

“…Samples of C(,Dft and C6H6 diluted to similar concentrations in acetonitrile were also run at the same time to determine the mass spectral cracking pattern. There were only four statistically significant peaks in the sample from the oxidation, viz., mje (intensity) 84 (28), 83 (100), 82 (21), and 81 (16). The GC-MS of C6H(, under the same conditions afforded mje (intensity) 79 (6), 78 (100), 77 (22), 76 (5), and 75 (4), and CaDí afforded mje (intensity) 85 (6), 84 (100), 82 (15),80(3), and 78 (0).…”