A Neutron Diffraction Study of [OsClH₃(PPh₃)₃]: A Complex Containing a Highly “Stretched” Dihydrogen Ligand

Abstract

Elastic bonds: The structure of [OsHCl(η2‐H2)(PPh3)3] has been determined by neutron diffraction (see figure). The complex presents an unusual H⋅⋅⋅H contact of 1.48(2) Å and can be regarded either as a highly stretched dihydrogen complex or as a compressed dihydride complex.

Polyhydrides of Platinum Group Metals: Nonclassical Interactions and σ-Bond Activation Reactions

“…The five-coordinate dichloride complex OsCl 2 (PPh 3 ) 3 ( 308 ) also reacts with molecular hydrogen. In the presence of NEt 3 , the reaction leads to the cis -hydride-compressed dihydride OsHCl­(H···H)­(PPh 3 ) 3 ( 309 ), which has been characterized by neutron diffraction analysis . The results confirm the presence of the compressed dihydride with a H···H separation of 1.48(2) Å.…”

Re-investigation of the structure and crystal chemistry of the Bi2O3–W2O6 `type (Ib)' solid solution using single-crystal neutron and synchrotron X-ray diffraction

“…The crystallographic detail being investigated on VIVALDI, e.g. H atoms (Yousufuddin et al, 2005;Van der Maelen et al, 2007) may warrant higher statistics, but this detail is not well determined by X-ray methods. The instrumental and data-reduction aspects, in particular the uncorrected systematic errors introduced by the wide waveband used in the Laue neutron technique, do influence the reported R factors.…”

“…The instrumental and data-reduction aspects, in particular the uncorrected systematic errors introduced by the wide waveband used in the Laue neutron technique, do influence the reported R factors. Furthermore, the majority of the published data from VIVALDI is based on small molecule crystallography rather than the solid-state/metal-oxide crystallography (Turner et al, 2005;Ding et al, 2005;Troyanov et al, 2004;Yousufuddin et al, 2005;Van der Maelen et al, 2007;Kemnitz et al, 2006). However, when time is not a limiting factor R F values near 0.05 can be achieved (Turner et al, 2005) with the wavelength-dependent errors absorbed by the high data redundancy.…”

Cyclometalation of 2-Vinylpyridine with MCl2(PPh3)3and MHCl(PPh3)3(M = Ru, Os)

“…The T 1 (min) value suggests that complex 10 can be classified as an elongated dihydrogen complex (or a compressed dihydride complex) . Reported osmium alkyl dihydrogen complexes closely related to 10 include Os(H 2 ) Cl(CHCHC 5 H 4 N)(P i Pr 3 ) 2 , Os(H 2 )(SnClPh 2 )(CHCHC 5 H 4 N)(P i Pr 3 ) 2 , Os(H 2 )ClH(PPh 3 ) 3 , Os(H 2 )X(C 6 H 4 COMe)(P i Pr 3 ) 2 (X = Cl, F) and Os(H 2 )Cl(PPh 3 )(PCP) 6 …”