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Hydrothermal reaction of cobalt or nickel nitrate with 5-tert-butylisophthalic acid (H2tbip) and bis(4-pyridylformyl)piperazine (bpfp) under varying synthetic conditions afforded four coordination polymers that were subsequently structurally characterized via single-crystal X-ray diffraction. {[Co(Htbip)2(H2O)2(bpfp)]·H2O}n (1), prepared with a lower concentration of added base, exhibits a 1D sawtooth chain structure. {[Co2(tbip)2(H2O)4(bpfp)]·2H2O}n (2), prepared under higher base conditions, and its analog {[Ni2(tbip)2(H2O)4(bpfp)]·2H2O}n (3), show isostructural 1D ladder topologies. {[Ni(tbip)(H2O)2(bpfp)]·2.25H2O}n (4), prepared using a higher concentration of reactants than for 3, manifests an extremely rare 658 4T10 4-connected self-penetrated topology and represents the first metal dicarboxylate coordination polymer to possess this network. Thermal decomposition behavior of these materials is also discussed. |
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