A novel two-dimensional network constructed by bridged salicylate and pyrazine ligands with copper(II)

Abstract

The coordination polymer, [Cu2(sal)2(pyz)(H2O)2]n (H2sal=salicylic acid, pyz=pyrazine), was synthesized and structurally characterized by X-ray crystallography. The empirical formula of the polymer is CuC9NO4H8and the structural parameters are as follows: Mr=257.71, monoclinic, P21/c, Z=4, a=10.175(3) A, b=7.352(4) A, c=12.757(1) A, β=105.206(2)°, V=920.9(6) A3, Dc=1.859 g/cm3, μ(MoKα)=23.62 cm−1, F(000)=520 and the final R=0.048 for 2179 observable reflections. Each salicylate ligand connects the three copper centers to afford a novel 2-dimensional (2-D) network structure. The CuII-sal framework forms a rhombus type coordination framework. The pyz ligands fill the voids of the sheet and coordinate to the Cu site.