106267-39-4Relevant academic research and scientific papers
Protonation of six-coordinate hydrido complexes of osmium(II). Examples of seven-coordination in osmium polypyridyl chemistry
Sullivan, B. Patrick,Lumpkin, Richard S.,Meyer, Thomas J.
, p. 1247 - 1252 (2008/10/08)
The hydrido-osmium(II) complexes trans-[Os(chelate) (PPh3)2(CO)H](PF6) (chelate = 2,2′-bipyridine, 4,4′-dimethyl-2,2′-bipyridine, and 5,5′-dimethyl-2,2′-bipyridine) undergo protonation with trifluoromethanesulfonic acid (TFMSH) in CH2Cl2 or trifluoroacetic acid (TFAH) media to form the dihydrido complexes [Os(chelate)(PPh3)2(CO)H2]2+. Through the interpretation of a series of NMR spectral experiments involving 1H, 2H, and 31P nuclei, arguments are developed that implicate a pentagonal-bipyramidal solution structure for [Os(bpy)(PPh3)2(CO)H2]2+ in 10% TFMSH-90% TFAH (by volume) solution. The proposed structure, which has PPh3 ligands above and below the pentagonal plane but adjacent hydrido ligands, is consistent with a protonation mechanism involving the least molecular reorganization on going from octahedral trans-[Os(bpy)(PPh3)2(CO)H]+ to pentagonal-bipyramidal [Os(bpy)(PPh3)2(CO)H2]2+.
