Solvothermal syntheses and crystal structures of new Cu(II) complexes with phenylsuccinic acid

Five new Cu(II) complexes [Cu(psa)(phen)] center dot 3H(2)O (1), [Cu(psa)(2bpy)] center dot 0.5H(2)O (2), [Cu(psa)(2bpy)(H2O)] center dot 3H(2)O (3), [Cu(psa)(4bpy)] center dot H2O (4), and [Cu(psa)(0.5)(N-3)(2bpy)] (5) (H(2)psa = phenylsuccinic acid, phen = 1,10-phenanthroline, 2bpy = 2,2 '-bipyridine, and 4bpy = 4,4 '-bipyridine) were obtained under solvothermal conditions and characterized by single-crystal X-ray diffraction. Complexes 2 and 3 were formed by one-pot reaction. In complex 2, Cu(II) ion is four-coordinated and locates at a slightly distorted square center. In complex 3, the coordinated water molecule occupies the axial site of Cu(II) ion forming a tetragonal pyramid geometry. Complexes I and 3 are of ID chain structures, and extended into 2D supramolecular network by hydrogen bonds. Complex 2 is of zipper structure, and further assembled into 2D supramolecular network by hydrogen bonds and pi-pi stacking interactions. Complex 4 is a 3D CdSO4-like structure with twofold interpenetration, while complex 5 is a dinuclear compound. The different structures of complexes 1-5 can be attributed to using the auxiliary ligands, indicating an important role of the auxiliary ligands in assembly and structure of the title complexes. (C) 2007 Elsevier Ltd. All rights reserved.