[Re(NBH2SBH3)(Me2PhP)(Et2dtc)]2 — a novel rhenium dimer with the unusual bridging (NBH2SBH3)4− ligand

The title compound is formed during the reaction of [ReN(Me2PhP)(Et2dtc)2] (Me2PhP=dimethylphenylphosphine, Et2dtc−=diethyldithiocarbamate) with excess BH3 in tetrahydrofurane. Two ReV atoms are linked by two (NBH2SBH3)4− units which act as three-dentate ligands via N, S and H forming an eight-membered metallacycle with additional coordination of an hydrido H atom trans to the nitrogen atom. The ReN multiple bond length is 1.70(1) A which is only slightly longer than in the starting compound [ReN(Me2PhP)(Et2dtc)2] (1.666(6) A).