Influence of the size of aromatic chelate ligands on the one-dimensional structures of copper(II) 4,4′-oxy-bis(benzoate) coordination polymers

Two one-dimensional coordination polymers, [Cu(Oba)(TATP)]n · nH2O (I) and [Cu(Oba)(DPPZ)(H2O)]n · nH2O (II) (Oba is 4.4′-oxy-bis(benzoate), TATP is 1,4,8,9-tetranitrogen-tris(phene), DPPZ is dipyrido[3,2-a:2′,3′-c]phenazine), have been synthesized under similar conditions and structurally characterized by elemental analysis, IR spectra, and X-ray crystal structure. Compounds I and II are based on topologically identical chains, where the copper centers chelated by the amine ligands are linked by the Oba bridges, as well as the coordination modes of the Oba ligands. However, the angles between the individual links and the environment of the copper centers are substantially different between the two compounds and were found to be primarily influenced by the sizes of the rigid aromatic chelate ligands.