Crystal and molecular structure of µ-oxo-bis[oxobis-(NN-diethyldi-thiocarbamato)rhenium(V)]; a complex with a linear O–Re–O–Re–O system

Abstract

The crystal and molecular structure of the title compound have been determined from single-crystal X-ray diffractometer data. The crystals are monoclinic with unit-cell dimensions: a= 16·343, b= 14·128, c= 15·346 Å, β= 93° 56′; space-group P2₁/n, and Z= 4. The structure was solved by Patterson and Fourier methods, and least-squares refinement, using 3523 independent reflections, has reached R 0·037. The molecule contains a linear O–Re–O–Re–O system. Each rhenium atom is also bonded to two bidentate NN-diethyldithiocarbamato-ligands (dtc) to give a slightly distorted octahedral co-ordination. The dtc ligands attached to the two rhenium atoms are staggered ca. 40° relative to each other. The eight Re–S distances have a mean value of 2·438 Å, while the mean Re–O(bridging) and Re–O(terminal) distances are 1·910 and 1·722 Å respectively. Bonding in the O–Re–O–Re–O system is discussed.