DINUCLEAR MANGANESE(II) COMPLEXES OF 2,6-BIS[2-(DIALKYLAMINO)-ETHYLIMINOMETHYL]-4-METHYLPHENOLATE(1-) - SYNTHESIS, STRUCTURE, AND MAGNETISM

2,6-Bis[2-(dialkylamino)ethyliminomethyl]-4-methylphenolate(1-) [alkyl = methyl (L1) or ethyl (L2)] forms two types of dinuclear manganese(II) complexes [Mn2L(RCO2)2(NCS)] (L = L1 or L, R = CH3 or C6H5) and [Mn2LCl3] (L = L1 or L2). The crystal structure of [Mn2L1(CH3CO2)2(NCS)].H2O.CH3OH has been determined: monoclinic, space group P2(1)/n, a = 17.700(3), b = 12.516(2), c = 15.263(3) angstrom, beta = 107.16(1)-degrees and Z = 4. The X-ray analysis reveals a dinuclear structure bridged by the phenolic oxygen of L1 and two acetate groups. The thiocyanate group co-ordinates to one Mn, resulting in different coordination geometries about the two manganese ions, i.e. trigonal bipyramidal and pseudo-octahedral. Magnetic susceptibility measurements over the temperature range 4.2-300 K indicate weak antiferromagnetic interaction (J = -2 to -5 cm-1) for [Mn2L(RCO2)2(NCS)] and no appreciable interaction for [Mn2LCl3].