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

Abstract

The structures of two facially coordinated Group VII metal complexes are reported, namely: fac-bromido[2-(2,2′-bipyridin-6-yl)benzoic acid-κ2N,N′]tricarbonylmanganese(I) tetrahydrofuran monosolvate, [MnBr(C17H12N2O2)(CO)3]·C4H8O, I, and fac-[2-(2,2′-bipyridin-6-yl)benzoic acid-κ2N,N′]tricarbonylchloridorhenium(I) tetrahydrofuran monosolvate, [ReCl(C17H12N2O2)(CO)3]·C4H8O, II. 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 octahedral geometry. In manganese complex I, the tetrahydrofuran (THF) solvent molecule could not be refined due to disorder. The benzoic acid fragment is also disordered over two positions, such that the carboxylic acid group is either positioned near to the bromide ligand or to the axial carbonyl ligand. In the crystal of I, the complex molecules are linked by a pair of C—H...Br hydrogen bonds, forming inversion dimers that stack up the a-axis direction. In the rhenium complex II, there is hydrogen bonding between the benzoic acid moiety and a disordered co-crystallized THF molecule. In the crystal, the molecules are linked by C—H...Cl hydrogen bonds, forming layers parallel to (100) separated by layers of THF solvent molecules.

Keywords

• crystal structure
• manganese complex
• rhenium complex
• bipyridyl ligand
• benzoic acid substituent
• disorder
• hydrogen bonding