Synthesis and Crystal Structure of a Di-μ2-phenolic Bridged Binuclear Manganese(III) Schiff Base Complex

A new complex [Mn(L)(NCS)](2).0.5CH(3)CN (H2L = N,N'-bis(chlorosalicylidene)-1, 2-diaminoethane) has been synthesized, and its structure (C70H51Cl8Mn4N13O8S4, M-r = 1833.84) was determined by single-crystal X-ray diffraction analysis. The crystal belongs to the monoclinic system, space group C2/c with a = 25.883(2), b = 12.3320(13), c = 13.5951(16) angstrom, beta = 112.906(2), V = 3997.2(7) angstrom(3), Z = 2, D-c = 1.524 g/cm(3), mu(MoK alpha)= 1.050mm(-1), F(000) = 1852, S = 1.098, the final R = 0.0630 and wR = 0.1847 for 2542 reflections with I > 2 sigma(I). The centrosymmetric title complex contains a dimer in which two distorted octahedral Mn(III) centers are bridged equatorially by phenolic oxygen of the Schiff base ligand. The units of the complex are linked via weak C H center dot center dot center dot N hydrogen bonds, leading to the formation of 1D chains along the b axis. The weak pi-pi packing interactions and weak intermolecular C(3)-H(3)center dot center dot center dot N(3) hydrogen bonds stabilize the crystal structure.