Co(II), Zn(II) and Cu(II) compounds with 1,4; 1,3 or 1,2-bis-(benzimidazole-1-yl-methylene)-benzene as a flexible spacer ligand: Synthesis, characterization and X-ray structures of some polynuclear species

New dinuclear and polynuclear Co(II), Zn(II) and Cu(II) compounds with the ligands 1,4-bis-(benzimidazole-1-yl-methylene)-benzene (bbpx), 1,3-bis-(benzimidazole-1-yl-methylene)-benzene (bbmx) and 1,2-bis-(benzimidazole-1-yl-methylene)-benzene (bbox) are reported. With Co(II) and Zn(II) and the ligands bbpx, bbmx and bbox six new dinuclear and polynuclear compounds are described, i.e. [CoCl2(bbpx)]n(DMF)2n (1), [CoCl2(bbmx)]2(DMF)2 (2), [ZnCl2(bbmx)]2(DMF)2 (3), [CoCl2(bbmx)]n(DMF)n/2(CH3OH)n/4 (4), [CoCl2(bbox)]n(DMF)3n/2 (5) and [ZnCl2(bbox)]n(DMF)3n/2 (6). Also one polynuclear Cu(II) compound is reported, i.e. [Cu(bbpx)2(C2N3)1.5(OH)0.5]2(DMF)4.15(CH3OH)1.75(H2O)3.5. The X-ray structures, physical and electronic properties are discussed.