82335-71-5Relevant academic research and scientific papers
Ethyldiphenylphosphine and 1,2-Bisethane: Derivatives of Hexacarbonylhydridovanadium(+I) and Hexacarbonylvanadate(-I)
Rehder, Dieter,Puttfarcken, Uwe
, p. 348 - 354 (2007/10/02)
The coordination properties of Ph2PEt (p1) and (Ph2PCH2CH2)2PCH2CH2P(CH2CH2PPh2)2 (p2p4) towards HV(CO)6 and (-) are compared.Preparation and spectral properties (IR, 1H, 31P and 51V NMR) are described for the complexes HV(CO)4(p1)2, 6-n(p1)n> (n=1,2), HV(CO)mp2p4 (m=1-5) and mp2p4> (m=1-3).The anionic species are obtained by photo-induced CO exchange, the hydrido complexes by treatment of the anionic complexes with t-BuCl/H2O or - more conveniently - by ion exchange on silica gel (m=1-3) and subsequent UV irradiation (m=4,5).Complexes containing four CO groups are cis-configurated, the p1 species being extremely labile.Trisubstitution yields an isomeric mixture of mer- and fac-2p4>(-).A consistent explanation of the 1H pattern in the hydride region is possible on the basis of a facecapped octahedral structure with a restricted dynamic behaviour.The positions of the CO ligands in HV(CO)3p2p4 and HV(CO)2p2p4 are facial and trans, respectively.Only chelate five-ring structures are formed. - Keywords: Carbonylvanadium, Carbonylvanadiumhydride, Vanadium-NMR, Dynamics
