Distorted octahedral environments in tricarbonylrhenium(I) complexes of 5-[2-(2,4,6-trimethylphenyl)diazen-1-yl]quinolin-8-olate and 5,7-bis[2-(2-methylphenyl)diazen-1-yl]quinolin-8-olate

The Re-I centres of two Re-I-tricarbonyl complexes, viz. tricarbonyl(pyridine-kappa N){5-[2-(2,4,6-trimethylphenyl)diazen-1-yl]quinolin-8-olato-kappa N-2(1),O}rhenium(I), [Re(C23H21N4O)(CO)(3)], (I), and {5,7-bis[2-(2-methylphenyl)diazen-1-yl]quinolin-8-olato-kappa N-2(1),O}tricarbonyl(pyridine-kappa N)rhenium(I), [Re(C28H23N6O)(CO)(3)], (II), are facially surrounded by three carbonyl ligands, a pyridine ligand and either a 5-[2-(2,4,6-trimethylphenyl)diazen-1-yl]quinolin-8-olate [in (I)] or a 5,7-bis[2-(2-methylphenyl)diazen-1-yl]quinolin-8-olate [in (II)] ligand, in a slightly distorted octahedral environment. The crystal structure of (I) is stabilized by two intermolecular C-H center dot center dot center dot O interactions and that of (II) is stabilized by three intermolecular C-H center dot center dot center dot O hydrogen-bonding interactions.