Chloro-1,2-bis(diphenylphosphino)ethanecarbonylrhodium(I): an exceptional complex within a series

Abstract

The ³¹P n.m.r. and i.r. spectra of the series of complexes [{RhCl(CO)(Ph₂P[CH₂]_nPPh₂)}_m](n= 1–4) have been studied; all the square-planar complexes are dimeric (m= 2) with a trans configuration about rhodium, except the complex (n= 2) which is monomeric and has a cis configuration.