Synthesis,Crystal Structure and Photocatalytic Properties of a Two-Dimensional Cobalt Coordination Polymer

A new two-dimensional Co(Ⅱ) coordination polymer { [Co(bppdca)(L) ]3H2O}n[bppdca = N,N'-bis(pyridine-3-yl) pyridine-3,5-dicarboxamide,L = 2-carboxymethylsulfanyl nicotinic acid] has been hydrothermally synthesized and structurally characterized by elementary analysis,IR and single crystal X-ray diffraction analysis. [Co(bppdca)(L) ]·3H2O is monoclinic with a space group of P21/ c,a = 1. 07419(9) nm,b = 0. 86166(6) nm,c = 2. 9853(2) nm,β = 96. 772(1) °,Z = 4,V = 2. 7439(4) nm3,Mr= 643. 49,Dc=1. 558 g/cm3,F(000) = 1324,μ = 0. 766 mm- 1,S = 1. 051,the final R = 0. 0406 and wR = 0. 1160. The crystal structure analysis indicates that the Co(Ⅱ) cation is six-coordinated by two nitrogen atoms from two bppdca ligands,one monodentate O atom and one S atom from one L anion,two chelating O atoms from another L anion. The adjacent Co(Ⅱ) ions are linked by L anions to form one-dimensional helical chain[Co(L) ]nand the chains are further connected by pairs of bppdca ligands to generate a two-dimensional network. Finally,the networks are linked by hydrogen bonding to form a three-dimensional supramolecular framework. Moreover, the thermal stability, electrochemical property, photoluminescence property and selective photocatalytic activity of the title compound are investigated. CCDC: 1010786