Poly[[[μ 3 -3-(2-carboxyl-atophen-yl)propionato][μ 2 - N , N '-(ethane-1,2-di-yl)bis-(pyridine-4-carbox-amide)]copper(II)] monohydrate], a layered coordination polymer with (4,4) topology.

In the title compound, {[Cu(C 10 H 8 O 4 )(C 14 H 14 N 4 O 2 )]·H 2 O} n , the Cu II cations are coordinated in a square-pyramidal fashion, with trans pyridyl-N donor atoms from two N -(2-(pyridin-3-yl-amino)-eth-yl)isonicotinamide (pein) ligands in the basal plane. The other three coordination sites are taken up by carboxyl-ate O-atom donors from three different 3-(2-carb-oxy-phen-yl)propionate (cpp) ligands. The central ethyl-enedi-amine segments of the pein ligands are disordered equally over two sets of positions. {Cu 2 O 2 } rhomboid clusters are connected into [Cu(cpp)(pein)] n (4,4) coordination polymer grids by the full span of the cpp and pein ligands. Individual layer motifs stack in an AAA pattern along the a axis by means of inter-layer hydrogen-bonding inter-actions.