Crystal structure of cis-bis(μ-β-alanine-κ2O:O′)bis[trichloridorhenium(III)](Re–Re) sesquihydrate

Abstract

The structure of the title compound, [Re2Cl6(C3H7NO2)2]·1.5H2O, comprises a dinuclear complex cation [Re—Re = 2.2494 (3) Å] involving cis-oriented double carboxylate bridges, four equatorial chloride ions and two weakly bonded chloride ligands in the axial positions at the two rhenium(III) atoms. In the crystal, two complex molecules and two water molecules constitute hydrogen-bonded dimers, while an extensive hydrogen-bonding network involving the groups of the zwitterionic ligand is important for generation of the framework. An additional partially occupied water molecule is disordered over two sets of sites about a symmetry centre with a site-occupancy ratio of 0.3:0.2.

Keywords

• crystal structure
• rhenium
• cluster
• β-alanine
• zwitterionic ammoniacarboxylato complex
• quadruple metal–metal bond