G. Szalontai, J. Bakos, I. Tóth
Sep 1, 1990
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Journal
Phosphorus Sulfur and Silicon and The Related Elements
Abstract
Abstract Although transition metal-phosphine-diene complexes can be conveniently studied by 31P NMR occationally other nuclei such as 13C or 1H can provide more valuable information. Here we report on the liquid state stereostructure and conformational behaviour of [Rh(NED(S,S-BDPP)]+, [Rh(COD)(S,S-BOPP)]+ and [Rh(NBO)(S,S-BDPP)Cl] complexes. Thc stereochemistry of these precursors is of interest Prom the point of homogenous catalytic reactions such as hydrogenation. In the square-planar cationic complexes the phnsphine chelate show C2 symmetry whereas in the spectra of the five-coordinated neutral species this symmetry is 1ost when recorded in aromatic solvents (C6D6, toluene-d6) or at lower temperatirra (31P, CO2Cl2 195 K). At the same time the 1H and 13C spectra indicate pairwise non-identity of the diene atoms.