3-Cyanopropyl(diphenyl)phosphine was synthesized from chloro(diphenyl)phosphine and 4-chlorobutyronitrile. This new ligand, along with (C6H5)2PCH2CN and (C6H5)2PCH2CH(CH3)CN were reacted with Re(CO)5X (X=Cl,Br) in 1:1 and 1:2.5 (metal:ligand) mole ratios.For all ligands, complexes with the stoichiometry Re(CO)3L2X were isolated from the 1:2.5 mole ratio reactions. Spectroscopic data suggest that the CO groups are facial and the ligands cis to each other.For all ligands, complexes with the stoichiometry Re2(CO)6L2X2 were isolated from the 1:1 mole ratio reactions. Spectroscopic evidence suggests that all the complexes are ligand bridged dimers which utilize the phosphorus and nitrogen lone pairs of the ligand.Ball State UniversityMuncie, IN 47306