Heterobimetallic Re–Pd, Re–Au and Re–Cu complexes derived from diphenylphosphino cyrhetrene: Synthesis and X-ray structure

Abstract

Diphenylphosphinecyrhetrene ligand (η 5-C 5H 4PPh 2)Re(CO) 3 ( 1) reacts with 1 equiv. of PdCl 2(NCPh) 2 to form, after workup, the square-planar trans-[(η 5-C 5H 4PPh 2)Re(CO) 3]PdCl 2(NCMe) ( 2). Similarly, reaction of 1 with (tetrahydrothiophene)AuCl produces, in excellent yield, the bimetallic complex [(η 5-C 5H 4PPh 2)Re(CO) 3]AuCl ( 3) with a linear P–Au–Cl moiety. From the reaction of 2 equiv. of 1 with CuBr(SMe 2) the planar-trigonal complex [(η 5-C 5H 4PPh 2)Re(CO) 3] 2CuBr ( 4) was obtained. 31P NMR and X-ray crystallography demonstrate, for the three cases, that (η 5-C 5H 4PPh 2)Re(CO) 3 acts as a monodentate ligand. The structural parameters of the bimetallic complexes are compared with related diphenylphosphinoferrocene metal complexes, described in the literature.