Crystal and Molecular Structure of Bis(2,2′-biquinolyl)di-μ-chlorodimanganese(II), an Intramolecular Antiferromagnet

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 P1, 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 Å3. 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