THE COORDINATION OF FUNCTIONALIZED DIPHOSPHINES TO RHODIUM - REACTIONS WITH [(RHCL(CO)2)2] TO GIVE BINUCLEAR COMPLEXES - CRYSTAL-STRUCTURE OF CIS-[(RHCL(CO))2(MU-(C7H4NS)2PCH2P(C7H4S)2)2].2C4H8O

Treatment of [{RhCl(CO)2}2] with the functionalised diphosphines (C6H4SMe-2)2PCH2P(C6H4SMe-2)2 (mtppm) and (C7H4NS)2PCH2P(C7H4NS)2 (dbtpm) gives the binuclear complexes [ClRh(mu-CO)(mu-mtppm)2Rh(CO)]Cl (A) and cis-[{RhCl(CO)}2(mu-dbtpm)2] (B) respectively. The structure of B has been confirmed by an X-ray structure determination which shows the essentially square-planar rhodium atoms to be ligated by a terminal chloride, a terminal carbonyl trans to the chloride, and a phosphorus from each of two bridging dbtpm ligands; the planes about the two Rh atoms are 13-degrees from being eclipsed.