Effect of pyridyl donor disposition and ligand flexibility on dimensionality in luminescent and nitrobenzene-detecting cadmium adamantanedicarboxylate coordination polymers

•Cadmium coordination polymers with 1,3-adamantanedicarboxylate (adc).•3D topologies with bis(pyridylmethyl)piperazine coligands.•Dimer-based 2D topology with very long spanning dipyridyl coligand.•Nitrobenzene detection capability in ethanol suspension.

Hydrothermal reaction of cadmium nitrate, 1,3-adamantanedicarboxylic acid (adcH2), and a hydrogen-bonding capable and conformationally flexible dipyridyl ligand has afforded five coordination polymers with differing dimensionalities and topologies. [Cd(adcH)2(4-bpmp)]n (1, 4-bpmp = bis(4-pyridylmethyl)piperazine) exhibits 1-D chain motifs with monodentate and protonated adcH ligands. {[Cd(adc)(4-bpmp)(H2O)]·4.5H2O}n (2) displays a non-interpenetrated 4-connected 658 cds network.[Cd4(adc)4(3-bpmp)(H2O)2]n (3, 3-bpmp = bis(3-pyridylmethyl)piperazine) displays a 3D tetranodal {4462}3{446482} topology network, derived from a primitive cubic net with regularly spaced pillar vacancies. {[Cd2(adc)2(4-bpmt)2]·H2O}n (4, 4-bpmt = bis(4-pyridylmethyl)trimethylenedipiperidine) shows a decorated (4,4) grid 2D structure based on syn–syn bridged {Cd2(OCO)2} dinuclear clusters. [Cd(adcH)2(4-bpfp)]n (5, 4-bpfp = bis(4-pyridylformyl)piperazine) shows a 1-D chain structure similar to that of 1. Thermal and luminescent properties of these new phases are reported, along with surveys of their capability to serve as detectors for nitrobenzene.

Graphical abstractFive cadmium coordination polymers containing 1,3-adamantanedicarboxylate (adc), and a conformationally flexible dipyridyl ligand has afforded five coordination have differing dimensionalities and topologies. [Cd4(adc)4(3-bpmp)(H2O)2]n (3-bpmp = bis(3-pyridylmethyl)piperazine) displays a 3D tetranodal {4462}3{446482} topology network, derived from a primitive cubic net with regularly spaced pillar vacancies. These materials can serve as detectors for nitrobenzene.Figure optionsDownload full-size imageDownload as PowerPoint slide