Hydrogen-bond-directed self-assembly of a novel 2D → 3D polythreading with finite components based on rigid ligand

The reactions of Cu(II) sulfate with 4-Amino-1,2,4-triazole (Atrz) and 1,3,5-Benzenetricarboxylic acid (H3BTC) gave a novel interesting coordination polymer {[Cu5(BTC)4(HAtrz)2(H2O)9]}n. The structure contains 2D undulated molecular layers. The BTC side arms can thread through the voids of adjacent polymeric units guided by strong intermolecular hydrogen bonding interactions, exhibiting an unusual 2D → 3D polythreading with finite components.