Crystal structures of a manganese(I) and a rhenium(I) complex of a bi-pyridine ligand with a non-coordinating benzoic acid moiety.

The structures of two facially coordinated Group VII metal complexes are reported, namely: -bromido-[2-(2,2'-bipyridin-6-yl)benzoic acid-κ,']tricarbonyl-manganese(I) tetra-hydro-furan monosolvate, [MnBr(CHNO)(CO)]·CHO, , and -[2-(2,2'-bipyridin-6-yl)benzoic acid-κ,']tricarbonyl-chlorido-rhenium(I) tetra-hydro-furan monosolvate, [ReCl(CHNO)(CO)]·CHO, . In both complexes, the metal ion is coordinated by three carbonyl ligands, a halide ion, and a 2-(2,2'-bipyridin-6-yl)benzoic acid ligand, in a distorted octa-hedral geometry. In manganese complex , the tetra-hydro-furan (THF) solvent mol-ecule could not be refined due to disorder. The benzoic acid fragment is also disordered over two positions, such that the carb-oxy-lic acid group is either positioned near to the bromide ligand or to the axial carbonyl ligand. In the crystal of , the complex mol-ecules are linked by a pair of C-H⋯Br hydrogen bonds, forming inversion dimers that stack up the -axis direction. In the rhenium complex , there is hydrogen bonding between the benzoic acid moiety and a disordered co-crystallized THF mol-ecule. In the crystal, the mol-ecules are linked by C-H⋯Cl hydrogen bonds, forming layers parallel to (100) separated by layers of THF solvent mol-ecules.