Synthesis and crystal structure of a novel binuclear copper(I) complex with bridging monohydrogensulfido (−SH) ligands

A novel dinuclear copper(I) complex, [Cu2(μ-SH)2(PPh3)3] (1) (PPh3=triphenylphosphine) has been prepared by the reaction of CuCl with triphenylphosphine and mercaptopropanoic acid (MPA) mixed in the ratio of 1:1:1. In the molecular structure, copper atoms are bridged by S atoms of two monohydrogensulfido anions forming a four-membered ring. One copper atom in 1 is coordinated with two sulfur atoms and one phosphorus atom of PPh3 adopting a trigonal planar geometry, while the coordination environment around the other copper center is distorted tetrahedral.