Synthesis and crystal structures of manganese(I) carbonyl complexes bearing ester-substituted α-diimine ligands

Abstract

The crystal structures of two manganese(I) complexes with ester-substituted bipyridine or biquinoline supporting ligands are reported, namely, fac-bromidotricarbonyl(diethyl 2,2′-bipyridine-4,4′-dicarboxylate-κ2 N,N′)manganese(I), [MnBr(C16H16N2O4)(CO)3], I, and fac-bromidotricarbonyl(diethyl 2,2′-biquinoline-4,4′-dicarboxylate-κ2 N,N′)manganese(I), [MnBr(C24H20N2O4)(CO)3], II. In both complexes, the manganese(I) atom adopts a distorted octahedral coordination sphere defined by three carbonyl C atoms, a Br− anion and two N atoms from the chelating α-diimine ligand. Both complexes show fac configurations of the carbonyl ligands. In I, the complex molecules are linked by C—H...Br hydrogen bonds and aromatic π–π contacts. In II, intramolecular C—H...O hydrogen bonds are present as well as intermolecular C—H...O and C—H...Br hydrogen bonds and π–π interactions.