Cadmium carboxycinnamate coordination polymers with dimensionality differences depending on dipyridyl ligand

Abstract Hydrothermal reaction of cadmium nitrate, carboxycinnamic acid (H 2 cca), and a tethering hydrogen-bonding capable dipyridyl ligand afforded three new crystalline coordination polymers, which were characterized by single-crystal X-ray diffraction. {[Cd(cca)(dpa) 2 ]·2H 2 O} n ( 1 , dpa = 4,4′-dipyridylamine) shows a (4, 4) coordination polymer layer, but with pendant dpa ligands curling in through the grid apertures. {[Cd(cca)(4-bpmp)(H 2 O)]·2H 2 O} n ( 2 , 4-bpmp = bis(4-pyridylmethyl)piperazine) also has a 2-D coordination polymer layer structure, but with closely interdigitated (6, 3) herringbone motifs. [Cd(cca)(4-bpfp)] n ( 3 , 4-bpfp = bis(4-pyridylformyl)piperazine) manifests a {Cd 2 (OCO) 2 } dimer-based 6-connected pcu 3-D network. All three materials undergo modest to strong blue-violet fluorescence under ultraviolet radiation. Thermal decomposition behavior is also probed.