Structurally Characterized Solvent-Induced Homotrinuclear Cobalt(II) N2O2-Donor Bisoxime-Type Complexes

Four new solvent-induced Co(II) complexes with chemical formulae [{CoL(mu(2)-OAc)(MeOH)}(2)Co] (1), [{CoL(mu(2)-OAc)(EtOH)}(2)Co] (2), [{CoL(mu(2)-OAc)(Py)}(2)Co] (3) and [{CoL(mu(2)-OAc)(DMF)}(2)Co] (4) (H2L = 4-nitro-4'-chloro-2,2'-[(1,3-propylene)dioxybis(nitrilomethylidyne)]diphenol) have been synthesized and characterized by elemental analyses, FT-IR, UV-Vis spectra and single-crystal X-ray diffraction. Each of the prepared complexes, crystallizing in the space groups P-1 (1 and 4), P2(1/n) (2) and P2(1/c) (3), consists of three Co(II) atoms, two completely deprotonated (L)(2-) units, two mu(2)-acetato ligands and two coordinated solvent molecules. Although the four complexes 1-4 were synthesized in different solvents, it is worthwhile that the Co(II) atoms in the four complexes 1-4 adopt hexa-coordinated with slightly distorted octahedral coordination geometries, and the ratio of the ligand H2L to Co(II) atoms is 2:3. The complexes 2-4 possess a self-assembled infinite 1D, 2D and 1D supramolecular structures via the intermolecular hydrogen bonds, respectively. Magnetic measurement was performed in the complex 3.