Nitroaromatic detecting zinc cyclohexyldicarboxylate coordination polymers with a long spanning dipyridyl tethering ligand

Abstract

Four new divalent zinc coordination polymers containing a dianionic cyclohexyldicarboxylate and the long-spanning pillaring dipyridyl ligand bis(4-pyridylmethyl)piperazine (bpmp) have been prepared and structurally characterized via single-crystal X-ray diffraction. Significant structural and topological diversity across the series is evident. {[Zn2(cis-12cdc)2(bpmp)]·6H2O}n (1, cis-12cdc = cis-1,2-cyclohexanedicarboxylate) shows a coordination polymer layer motif with embedded paddlewheel {Zn2(OCO)4} dinuclear units and T6(4)4(4) classification water tapes. Using cis-1,2-cyclohex-4-enedicarboxylate (cis-12chedc) afforded [Zn2(cis-12chedc)2(bpmp)(H2O)2]n (2), which manifests a simple yet unusual (6)(648.10) topology. [Zn2(cis-13cdc)2(bpmp)]n (3, cis-13cdc = cis-1,3-cyclohexanedicarboxylate) displays sawtooth (4,4) coordination polymer layers, while [Zn2(trans-14cdc)2(bpmp)]n (4, trans-14cdc = trans-1,4-cyclohexanedicarboxylate) shows a 3D system of coordination polymer networks with 3-fold interpenetrated 41263pcu topology. The layered phases 1–3 showed capability for the detection of small quantities of nitrobenzene in ethanol suspension.