Diverse stacked and entangled topologies in cadmium tricarballylate coordination polymers with nitrobenzene detection capability

Abstract Hydrothermal reaction of cadmium salts, tricarballylic acid (H 3 tca) and dipyridyl ligands resulted in generation of four coordination polymers that were characterized by single-crystal X-ray diffraction. The nature of the ancillary dipyridyl ligand plays a primary role in enforcing differing structural topologies across the series of new phases. [Cd 2 (tcaH) 2 (dpe) 2 ] n ( 1 , dpe = 1,2-di(4-pyridyl)ethane) displays a 2-fold interpenetrated 3D 4 12 6 3 pcu net based on 6-connected {Cd 2 (O)(OCO)} cluster nodes. [Cd(tcaH)(dpp)(H 2 O)] n ( 2 , dpp = 1,2-di(4-pyridyl)propane) manifests a 1D + 1D → 3D interlocked system of loop-containing perpendicular ribbon motifs. {[Cd 4 (tca) 2 (Htca)(bpmp) 5 (H 2 O) 2 ]·27H 2 O} n ( 3 , bpmp = bis(4-pyridylmethyl)piperazine) has intersecting [Cd 4 (tca) 2 (Htca)(H 2 O) 2 ] n layer, [Cd(bpmp)(H 2 O)] n chain, and [Cd 2 (bpmp) 3 ] n ladder submotifs and forms a complicated 3,4,5-connected trinodal 3D self-penetrated network with (6.9 2 )(4 2 6 3 8)(4 2 6 3 8.9 3 10) topology. {[Cd(tcaH)(Hbpmp)](ClO 4 )·5.5H 2 O} n ( 4 ) exhibits stacked cationic bilayer (4,4) grid slabs. All compounds showed potential as potential detectors for nitrobenzene in ethanol suspension via luminescence quenching, with 1 showing the highest uptake of analyte.