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

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-κ(2) N,N′)mangan­ese(I), [MnBr(C(16)H(16)N(2)O(4))(CO)(3)], I, and fac-bromido­tricarbon­yl(diethyl 2,2′-bi­quinoline-4,4′-di­carboxyl­ate-κ(2) N,N′)manganese(I), [MnBr(C(24)H(20)N(2)O(4))(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.