Structural diversity and dye degradation capability of copper 1,2-phenylenediacetate coordination polymers with flexible dipyridylamide ligands

Abstract Hydrothermal reaction of copper nitrate, 1,2-phenylenediacetic acid (pdaH 2 ), and flexible dipyridylamide ligands afforded four new coordination polymers with diverse structural topologies, as characterized by single crystal X-ray diffraction. {[Cu(pda)(hdn)(H 2 O) 2 ]·2H 2 O} n ( 1 , hdn =  N , N ′-(hexane-1,6-diyl)dinicotinamide) shows 1D ribbon motifs. In contrast, [Cu(pda)(hdin)] n ( 2 , hdin =  N , N ′-(hexane-1,6-diyl)diisonicotinamide) presents a rare example of a five-fold interpenetrated 4-connected 6 5 8 cds 3D topology. [Cu(pda)(bdn)] n ( 3 , bdn =  N , N ′-(butane-1,4-diyl)dinicotinamide) displays an unprecedented 3,5-connected binodal (6 3 )(6 7 8 3 ) 3D topology with embedded {Cu(OCO)} n axial-equatorial bridged chain motifs. {[Cu(pda)(bpfp)(H 2 O)]·4H 2 O} n ( 4 , bpfp =  N , N ′-(bis-4-pyridylformyl)piperazine) shows rectangular (4,4) grid submotifs. All four materials were assayed as heterogeneous catalysts for the degradation of Congo Red (CR) in aqueous suspension under ultraviolet irradiation; only compound 3 catalyzed the degradation. Thermal properties of 1 – 4 are also discussed herein.