One-dimensional Cu(II) coordination polymers: tuning the structure by modulating the “carboxylate arm” lengths of polycarboxylate ligands

Abstract

To understand the influence of the ligand on crystal growth, two new polycarboxylate ligands, 2-(carboxyphenyl)iminoacetic propanoic acid (H₃cpiap) and 2-(carboxyphenyl)iminodipropanoic acid (H₃cpidp), have been synthesized. The reaction of each with Cu(NO₃)₂·3H₂O under similar reaction conditions yields two 1D coordination polymers {[Cu₃(cpiap)₂(H₂O)₃](µ-H₂O)}_n·7nH₂O (1) and [Cu(H₂cpidp)₂(H₂O)₂]_n·4nH₂O (2), respectively. A T5(2) 1D water tape constructed from an edge-sharing cyclic pentamer has been observed in compound 1, in which the water chains interact with the 1D coordination polymer chains to form a 3D supramolecular binodal (5,8)-network through hydrogen-bonding interactions.