Cadmium and cobalt oxybis(benzoate) coordination polymers with diverse topologies depending on dipyridylamide ligands including a new self-penetrated network

Abstract Hydrothermal reaction of cadmium or cobalt nitrate, oxybis(benzoic acid) (obaH 2 ), and a hydrogen-bonding capable dipyridylamide ligand afforded four crystalline coordination polymers whose dimensionality depends critically on the coordination environment or dipyridylamide length. The four new phases were structurally characterized via single-crystal X-ray diffraction. {[Cd(obaH) 2 (3-pina) 2 ]·2(3-pina)·2H 2 O} n ( 1 , 3-pina = 3-pyridylisonicotinamide) shows 1D chain motifs, while {[Co(oba)(3-pina)]·H 2 O} n ( 2 ) displays closely interdigitated 2D (4,4) grid layer motifs. The longer-spanning dipyridylamide ligand N , N ′-(hexane-1,6-diyl)diisonicotinamide (hdin) afforded coordination polymers with more interesting self-penetrated or entangled 3D networks. [Cd(oba)(hdin)] n ( 3 ) manifests a unique 4,6-connected 3D self-penetrated network with {4 2 6 2 7 2 }(4 2 6 8 7 2 8 3 } topology. [Co 2 (oba) 2 (hdin)] n ( 4 ) exhibits a {Co 2 (OCO) 4 } paddlewheel-dimer based 6-connected 3-fold interpenetrated jsm net with 5 10 6 4 8 topology. Luminescent behavior in 1 and 3 is attributed to intra-ligand molecular orbital transitions. The new d 10 phases were also surveyed for the ability to detect nitrobenzene in ethanol suspension. Thermal decomposition behavior is also discussed herein.