Formation of a µ4-methanedithiolate by transfer of two H atoms from Re to a CS2 molecule. Synthesis and crystal structure of [{Re2(µ-H)(CO)8}2(µ4-S2CH2)]
Abstract
The reaction of the unsaturated dinuclear molecule [Re2(µ-H)2(CO)8] with CS2 affords in good yield the complex [{Re2(µ-H)(CO)8}2(µ4-S2CH2)], containing a methanedithiolate H2CS2 fragment originated by the transfer of two hydrides, presumably one from each metal complex, to CS2. The molecule has been characterized spectroscopically and by single-crystal X-ray diffraction analysis. The crystals are monoclinic, space group P21/c, with a= 13.559(1), b= 12.502(1), c= 16.718(1)Å, β= 99.26(1)°. The structure was refined on the basis of 2689 significant reflections to a final R value of 0.026. The molecule consists of two Re2(µ-H)(CO)8 units linked by a methanedithiolate ligand. Each sulfur atom bridges two Re atoms belonging to the same dinuclear moiety. The overall idealized symmetry of the molecule is C2. The average Re–Re and Re–S bond lengths are 3.089 and 2.475 Å, respectively.
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