34397-70-1Relevant academic research and scientific papers
Rhodium(I) and iridium(I) complexes with 1,1,1-tris(diphenylphosphinomethyl)ethane
Siegl,Lapporte,Collman
, p. 2158 - 2165 (2008/10/08)
Rhodium(I) and iridium(I) complexes of the tripodal ligand 1,1,1-tris(diphenylphosphinomethyl)ethane, TDPME, of the type MCl(CO)(TDPME) were synthesized. The iridium(I ) complex appears to be five-coordinate in the solid state but to be capable of dissociating a phosphine ligand in solution. The rhodium(I) complex is apparently a mixture of four- and five-coordinate isomers (with TDPME as either a bidentate or a tridentate ligand) both in the solid state and in solution. The existence of a facile equilibrium between four- and five-coordinate configurations of the rhodium(I) and iridium(I) complexes in solution is suggested by their rapid reaction with carbon monoxide to form dicarbonyl species. Reactions with oxygen, sulfur dioxide-oxygen, and p-nitrobenzoyl azide which yield (bidentate) carbonato, sulfato, and isocyanato complexes have been examined. The TDPME complexes differ significantly in reactivity from the rhodium(I) and iridium(I) complexes, trans-MCl(CO)L2, from which they are derived. A five-coordinate d8 iridium(I) complex with azido and carbonyl ligands in adjacent coordination sites was synthesized and found to be stable.
