Crystal structure of [Mn2(III)(salpa)2Cl2(H2O)2] (H2salpa=1-(salicylaldeneamino)-3-hydroxypropane)

The manganese complex, (Mn-2(III)(salpa)(2)Cl-2(H2O)(2)], has been prepared and its structure determined using x-ray crystallography. The dimer is a di-mu(2)-alkoxo complex which is a six-coordinate manganese dimer with unsupported alkoxide bridges and a rare example of a chloride- and water-containing manganese dimer. The complex crystallizes in the monoclinic space group P2(1)/c with a = 9.315(5), b = 11.130(4), c = 11.637(5) Angstrom, beta = 104.33(3)degrees, V = 1169.0(9) Angstrom(3), and Z = 2. The structure comprises discrete binuclear clusters in which the metal atoms are bridged by two alkoxo oxygens of the salpa(2-) ligands. The Mn-O and Mn-N distances are in good agreement with those found for other manganese(III) Schiff base complexes. The Mn-Cl and Mn-O3 distances are 2.585(2) and 2.371(2) Angstrom, respectively, and the Mn ... Mn distance is 3.001(1) Angstrom. In the crystal, there are two types of hydrogen bonding between the H2O molecule and the CI atom with Cl ... H(H2O) distance of 2.33(6) (intramolecule: -1 + x, y, -1 + z) and 2.68(6) Angstrom (intermolecule: -1 + x, 0.5-y, -0.5 + z).