First heterobimetallic Mn/M(M = Cu, Ni) complexes with open-chain aliphatic schiff-base ligands obtained by direct template synthesis

Four new heterobimetallic complexes [CuL1][MnCl4] (1), [CuL2][MnCl4] (2), [NiL1][MnCl4] (3), [NiL2][MnCl4] (4) (L1 = 4,6,6-trimethyl-1,9-diamino-3,7-di-aza-nona-3-ene; L2 = 1,15-dihydroxy-7,9,9-trimethyl-3,6,10,13-tetra-aza-pentadeca-6-ene) have been prepared from elemental metals, ethylenediamine dihydrochloride or its N-(2-hydroxyethyl) derivative and acetone by the template condensation reaction. All complexes have been characterized by elemental analysis, IR and UV-Visible spectroscopy. The structures of 2 and 3 have been determined by X-ray crystallography (2: Orthorhombic, Pna2 1, a = 20.136(4), b = 11.185(2), c = 10.251(2)Å, Z = 4; 3: Orthorhombic, Pca2 1, a = 14.335(2), b = 11.405(2), c = 11.154(2)Å, Z = 4 ). Both crystals consist of alternating complex cations [ML]2+ and anions [MnCl4]2− linked together by N–H···Cl–Mn and O–H···Cl–Mn hydrogen bonds forming 2D corrugated sheets in (2) and 1D helical chains in (3). Complex 2 represents the first single crystal structure elucidation of the complex containing L2.