Crystal structure and characterization of a new one-dimensional copper(II) coordination polymer containing a 4-aminobenzoic acid ligand

A Cu II coordination polymer, catena -poly[[[aquacopper(II)]-bis(μ-4-aminobenzoato)-κ 2 N : O ;κ 2 O : N ] monohydrate], {[Cu( p ABA) 2 (H 2 O)]·H 2 O} n ( p ABA = p -aminobenzoate, C 7 H 4 NO 2 − ), was synthesized and characterized. It exhibits a one-dimensional chain structure extended into a three-dimensional supramolecular assembly through hydrogen bonds and π–π interactions. While the twinned crystal shows a metrically orthorhombic lattice and an apparent space group Pbcm , the true symmetry is monoclinic (space group P 2/ c ), with disordered Cu atoms and mixed roles of water molecules (aqua ligand/crystallization water). The luminescence spectrum of the complex shows an emission at 345 nm, cf. 349 nm for p ABAH.