CRYSTAL-STRUCTURE OF 2 COCRYSTALLIZED COMPLEXES OBTAINED FROM THE REACTION OF MAGNESIUM-CHLORIDE WITH 2,4-PENTANEDIONE

The crystal structures of two cocrystallized complexes of MgCl2 with 2 ,4-pentanedione have been determined. The conglomerate crystallizes in the monoclinic system, space group P 2(1)/c (No. 14); a = 7.835(2), b = 18.169(4), c = 13.303(3) Angstrom, beta = 90.70(2)degrees, Z = 4. T he former complex is a dimer which consists of two octahedra sharing o ne edge by two chlorine bridges between the metal atoms. The chelate r ing in the equatorial plane and two apical water molecules realize the coordination polyhedron around each Mg atom. In the latter complex th e metal lies at the center of a slightly distorted octahedron formed b y six oxygens, four from two chelate ligands and two from apical water molecules.