Influence of the size of aromatic chelate ligands on the one-dimensional chains of copper(II) dicarboxylate coordination polymers

To investigate the influence of the size of aromatic chelate ligands on the frameworks of metal dicarboxylate polymers, two one-dimensional coordination compounds Cu(BDC)(TATP)(H₂O)] _n (I) and Cu(BDC)(DPPZ)] _n (II), (BDC = 1.4-benzenedicarboxylate, TATP = 1,4,8,9-tetranitrogentrisphene, DPPZ = dipyrido3,2-a:2′,3′-c]phenazine) were synthesized under similar conditions and structurally characterized by X-ray crystallography. Compounds I and II have the similar zigzag chain structure, but the substitution of TATP with DPPZ results in the difference of the degree of bending of the chain, indicating that the sizes of the rigid aromatic chelate ligands have important effect on the structures of their complexes.