Crystal structures of the methanol and hexanol adducts of tris(8-quinolinolato)manganese(III)

Abstract

Both the methanol and hexanol adducts of tris(8-quinolinolato)manganese (III) have been shown to be isomorphic. They crystallize in the monoclinic space groupP2₁/n with four molecules in the unit-cell. The cell dimensions of the methanol adduct area= 10.847(3),b= 13.201(4),c= 17.285(5) Å β = 97.56(5) °; the asymmetric molecular unit being Mn(C₉H₆NO)₃.CH₃OH. For the hexanol adduct,a =11.201(4),b=13.342(4),c = 17.200(5) Å, β = 97.09(6) °, with an asymmetric molecular unit, Mn(C₉H₆NO)₃ · 1/2(C₆H₁₃OH). The methanol adduct structure was deduced from CuKα. intensities visually estimated from Weissenberg films, but refined on data rerneasured on a four-circle diffractometer. Data measured with Mokα radiation on a diffractometer was used for the analysis of the hexanol adduct. Both structures were solved by the heavy-atom method and refined by difference and least-squares procedures. AnR of 0.079 for the 1536 observed terms of the methanol structure and anR of 0.063 for the 2509 observed terms of the hexanol structure were attained. The complexes are in themeridional conformation, with the manganese atoms coordinated to the bidentate 8-quinolinol ligands in a distorted octahedral configuration. In the methanol structure, two methanol molecules related by the crystallographic center of symmetry lie in a “cage-like” cavity in the crystal structure, whereas in the hexanol structure only one hexanol molecule is so accommodated. The latter is disordered, the crystallographically imposed symmetry requiring that it adopts two orientations in the unit-cell.