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

Hydrothermal reaction of cadmium nitrate, 1,3-adamantanedicarboxylic acid (adcH(2)), 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)]center dot 4.5H(2)O}(n) (2) displays a non-interpenetrated 4-connected 6(5)8 cds network. [Cd-4(adc)(4)(3-bpmp)(H2O)(2)](n) (3, 3-bpmp = bis(3-pyridylmethyl)piperazine) displays a 3D tetranodal {4(4)6(2)}(3){4(4)6(4)8(2)} topology network, derived from a primitive cubic net with regularly spaced pillar vacancies. {[Cd-2(adc)(2)(4-bpmt)(2)]center dot H2O}(n) (4, 4-bpmt = bis(4-pyridylmethyl)trimethylenedipiperidine) shows a decorated (4,4) grid 2D structure based on syn-syn bridged {Cd-2(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. (C) 2016 Elsevier B.V. All rights reserved.