Crystal and molecular structure of bromotricarbonyl(NNN′N′-tetramethylethane-1,2-diamine)rhenium(I)

Abstract

The crystal structure of the title compound has been determined from X-ray diffractometer data by the heavy-atom method. Crystals are monoclinic, space group P2₁/_n with a= 1 292.9(9), b= 1 474.2(6), c= 753.4(4) pm, β= 101.83(3)°, and Z= 4. The structure has been refined by block-diagonal least squares to R 0.075 for 1 699 observed reflections. The co-ordination geometry about rhenium is approximately octahedral with the bromine and tetramethylethane-1-2-diamine ligands mutually cis. The Re–Br bond is 263.6(2) pm long. The chelate ring is disordered and two crystallographically independent conformations are found for the molecule, differing in the way in which the carbon–carbon bond in the chelate ring bends to achieve an unstrained conformation.