Synthesis and structural characterization of two dimensional cadmium(II) coordination polymers

Abstract

Reactions of Cd(NO3)2 · 4H2O with NH4SCN, ppz (ppz = piperazine) and bpa (bpa = bis(4-pyridyl)ethane) in CH3OH afforded the cavity-containing rectangular grids {Cd(SCN)2(ppz)} n (1) and {Cd(NCS)2(bpa)} n (2). The ppz ligand in 1 is coordinated to the metal through both nitrogen atoms to form the 1-D zig-zag chain structure and distorted {CdN4S2} octahedral coordination geometry at each Cd center is completed by pairs of bidentate thiocyanato ligands. Complex 2 has the 2-D arrangement constructed through 1-D double μ(N,S) end-to-end bridging thiocyanato groups bridging Cd(II) chains interconnected through disordered bpa ligands.