Magnetic Properties of a Series of Trinuclear Complexes (CuL)2Mn·xB (L Representing the Deprotonated Form of N-(4-Methyl-6-oxo-3-azahept-4-enyl)oxamic Acid and B Representing Respectively H2O (x = 5, 4.5, 3, 1), (CH3)2SO (x = 2), and C5H5N (x = 4)). Crystal and Molecular Structure of (CuL)2Mn·2(CH3)2SO

A series of (Cu, Mn, Cu) complexes have been prepared and characterized. They may be described by the overall formula (CuL)2Mn·xB where L stands for the deprotonated form of N-(4-methyl-6-oxo-3-azahept-4-enyl)oxamic acid and B for respectively H2O (with x = 5, 4.5, 3, 1), (CH3)2SO (with x = 2), and C5H5N (with x = 4). The crystal and molecular structures of (CuL)2Mn·2(CH3)2SO have been solved. The crystals are monoclinic, space group P21/n with cell constants a = 8.362(2) A, b = 14.426(3) A, c = 24.442(6) A, and Z = 4. In each (Cu, Mn, Cu) molecular unit the central Mn(II) ion is bridged to two copper(II) ions through two oxamato groups. Short intermolecular Cu···Cu distances lead to the formation of a chain-like packing pattern running parallel to the c-axis. Magnetic susceptibility measurements have been performed for the six complexes. Five complexes display the same behavior which corresponds to the occurrence of antiferromagnetic Cu−Mn interactions within isolated trinuclear units. The J values are b...