Abstract
Three novel supramolecular polymers, [(Cd2Cl3)(H2O)2(N3)3 (bpe)] (bpe = 1,2-bis(pyridinium)ethane)(1), [(ZnCl4)(bpe) (ZnCl3N3)(bpe)](2), and [(CdCl2Br2)(bpe)] (3), were synthesized in polar organic solvents using solvent diffusion method, and the three compounds have been characterized by single-crystal X-ray diffraction and IR spectroscopy. Compound 1 comprises discrete bpe cations and centrosymmetric tetrameric anions in which cadmium(II) centers have two distinct coordination modes (four- and six-coordinated) bridged by end-on azide. The three-dimensional (3-D) organic–inorganic hybrid supramolecular structure is formed by a series of hydrogen bonds (O-H···Cl and O-H···N). Compared with compound 1, the reactants of complex 2 also include sodium azide, bpe2+ and transition metal salt except that ZnCl2 instead of CdCl2, but compound 2 is only a mononuclear complex with two different tetrahedral configuration of Zn centers. The mononuclear compound 3 crystallizes in orthorhombic system with the space group Pnma, and the Cd(I) atom is four-coordinated in a distorted tetrahedral geometry by two terminal Cl and two terminal Br.