Abstract
Hydrothermal synthesis has generated oxoanion-free divalent cadmium 1,4-phenylenedipropionate (phdp) coordination polymers containing either bis(4-pyridylmethyl)piperazine (bpmp) or bis(4-pyridylformyl)piperazine (bpfp) ligands. The coordination environment at cadmium appears to dictate the overall dimensionality of the resulting coordination polymer crystal structure. {[Cd(phdp)(bpfp)(H 2O)]·4H 2O} n ( 1) possesses pentagonal bipyramidal coordination at cadmium with trans pyridyl donors and displays a simple 2-D (4,4) grid network. {[Cd(phdp)(bpmp)]·5H 2O} n ( 2) exhibits distorted octahedral coordination with cis pyridyl donors, resulting in a 3-D 3-fold interpenetrated diamondoid network. Both 1 and 2 show visible-light luminescence upon ultraviolet excitation, with the emission maximum depending on the nature of the dipyridyl coligand.
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