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

A Cu II coordination polymer, catena -poly[[[aqua-copper(II)]-bis-(μ-4-amino-benz-o-ato)-κ 2 N : O ;κ 2 O : N ] monohydrate], {[Cu( p ABA) 2 (H 2 O)]·H 2 O} n ( p ABA = p -amino-benzoate, C 7 H 4 NO 2 - ), was synthesized and characterized. It exhibits a one-dimensional chain structure extended into a three-dimensional supra-molecular assembly through hydrogen bonds and π-π inter-actions. While the twinned crystal shows a metrically ortho-rhom-bic 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 mol-ecules (aqua ligand/crystallization water). The luminescence spectrum of the complex shows an emission at 345 nm, cf. 349 nm for p ABAH.