Design and syntheses of 1D and 2D coordination polymers resulting from flexible building blocks

Two new mixed-ligand coordination polymers, [Cd(bpp)(cpg)2 (H2O)2] (1), [Zn(bpp)(cpg)]·H2O (2), have been synthesized. The central cadmium and zinc ions are hexa-coordinate and tetra-coordinate, respectively. X-ray analyses show that different coordination propensity of cadmium and zinc ions leads to different structures, 1D bilayer ladder (1) and 2D rectangle grid network (2), in which cpg and bpp ligand exist as their stable conformation, respectively (TT-form and TG-form).