The first example of a bromo- and phosphido-bridged binuclear rhenium carbonyl complex

Abstract

The ionic crystals of the title complex, tetra­phenyl­phos­pho­nium μ‐bromo‐bromo­hepta­carbonyl‐μ‐di­cyclo­hexyl­phos­phido‐dirhenate, (C24H20P)[Re2Br2(C12H22P)(CO)7], are built of tetra­phenyl­phospho­nium cations and (μ‐Br)(μ‐PCy2)(CO)7BrRe2− anions. The latter is the first example of a bromo‐ and phosphido‐bridged binuclear rhenium carbonyl complex. The Re—Br bond lengths are 2.6786 (7) and 2.6482 (7) Å for the bridging Br atom, and 2.6146 (8) Å for the terminal Br ligand. The Re⋯Re distance of 3.930 Å is clearly non‐bonding which is not unexpected for the 36 valence‐electron complex anion.