Two 3-D supramolecular networks containing dimeric {Cu₂X₂} cluster units

Two new 3-D supramolecular compouds: [Cu₂X₂(Hpyba)₂]_n (X = Br (1), I (2), Hpyba = 4-pyridin-4-yl-benzoic acid) have been hydrothermally synthesized and structurally characterized. Although both compounds exhibit different space groups, they have a similar structure. Each {Cu₂X₂} cluster unit interconnects to form a 1D stair-step chain. The Saturated Hpyba ligands are regularly appended to both sides of main chain, linked via N atoms of ligands. These infinite chains are further linked by H-bonds and π-π interactions to form a 3-D supramolecular network structure. The thermal stability of 1 and 2 was investigated by thermogravimetric measurements.