Synthesis, structure, and characterization of two Zn(II) complex containing two-dimensional bilayer structure

Two new Zn(II) complexes, [Zn-2(L)(H2O)(3)]center dot H2O (1) and [Zn-3(HL)(2)(bPP)(2)(HbPP)(2)]center dot 10H(2)O center dot 2ClO(4) (2) (H4L = cis,cis,cis,cis-1,2,3,4-cyclopentanetracarboxylic acid, bpp = 1,3-bis(4-pyridyl)propane), have been synthesized and characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction techniques. The structure indicates that the complex 1 crystallizes in triclinic, space group P (1) over bar, in which, the four carboxylate groups of L ligand adopt mu(2)-eta(1):eta(0), mu(2)-eta(1):eta(1), mu(1)-eta(1):eta(1) coordination modes, respectively, bridging Zn(II) atoms to generate a (4,6)-connected 2D bilayer network. The structure indicates that the complex 2 crystallizes in monoclinic, space group C2/c, in which, three deprotonated carboxylate groups of L ligand adopt uniform mu(2)-eta(1):eta(0) coordination mode linking Zn(II) atoms to form a 1D polymeric ribbon, the bpp ligands further extend such ribbon giving rised to a (3,4)-connected 2D bilayer network. The most striking feature of 1 and 2 is that both of bilayer networks contain 1D solvent channel, where water molecules are located. In additional, luminescent properties of two complexes have also been studied. (C) 2014 Elsevier B.V. All rights reserved.