The structural characterization of Re2Cl4(μ-dcpm)2 (dcpm=Cy2PCH2PCy2) and a new crystallographic form of Re2Cl4(μ-dppm)2 (dppm=Ph2PCH2PPh2)

The single crystal X-ray structures of the triply bonded complexes Re2Cl4(μ-dcpm)2 (1) (dcpm=Cy2PCH2PCy2) and a new crystal form of Re2Cl4(μ-dppm)2 (2) (dppm=Ph2PCH2PPh2) have been determined and are compared with literature data for other complexes of this type. Complexes 1 and 2 both possess staggered rotational geometries. Complex 1 has ReRe distances of 2.2256(4) and 2.2267(4) Å for two crystallographically independent molecules. Complex 2 also has two independent molecules in the asymmetric unit, one of which is normal with ReRe=2.2497(4) Å, whereas the other exhibits a twofold orientational disorder for the ReRe unit (distances 2.2368(5) Å and 2.231(4) Å for the major (90%) and minor (10%) forms respectively).