Crystal and molecular structure of bis(2,2′-biquinolyl)di-µ-chlorodimanganese(II), an intramolecular antiferromagnet

Abstract

The crystal structure of the 2,2′-biquinolyl (biq) complex of manganese(II) chloride, an intramolecular ferromagnet, provides empirical data on the relation between structure and magnetic exchange. The complex is binuclear, with a pair of chlorine atoms bridging the metal atoms in a central Mn₂Cl₂ plane. The bridging Mn–Cl bonds are slightly elongated and three stronger bonds hold the bidentate biq ligands and the remaining chlorine to each metal atom. Crystals are triclinic, space group P, with Z= 1, in a unit cell of dimensions: a= 11.275(3), b= 10.115(6), c= 14.681(8)Å, α= 95.71(7), β= 133.49(4), γ= 118.50(4)°, U= 791 ų. The structure was determined from diffractometer data by the heavy-atom method and refined by least-squares to R 2.7% for 1 288 reflections.