Synthesis,crystal structure,and magnetic properties of ([Cu(oxbe)]Mn(H(2)O)[Cu(oxbe)(DMF)])(n).nDMF.nH(2)O: From dissymmetrical mononuclear entities to a 3D heterometallic supramolecular coordination polymer

Self-assembly of the building block Cu(oxbe)](-) with Mn(II) led to a novel coordination polymer (Cu(oxbe)]Mn(H(2)O)Cu(oxbe)(DMF)])n).nDMF.nH(2)O, where H(3)oxbe is a new dissymmetrical ligand N-benzoato-N'-(2-aminoethyl)oxamido and DMF = dimethylformamide. The crystal forms in the triclinic system, space group Ponemacr;, with a = 9.260(4) A, b = 12.833(5) A, c = 15.274(6) A, alpha = 76.18(3) degrees, beta = 82.7(3) degrees, gamma = 82.31(3) degrees, and Z = 2. The crystal structure of the title complex reveals that the two-dimensional bimetallic layers are constructed of Cu(II)Mn(II)Cu(II) chains linked together by carboxylate bridge and hydrogen bonds help to produce a novel three-dimensional channel-like structure. The magnetic susceptibility measurements (5-300 K) were analyzed by means of the Hamiltonian H = -2JS(Mn)(S(Cu1) + S(Cu2)), leading to J = -17.4 cm(-1).