Chain, ladder and self-penetrated cobalt and nickel coordination polymers containing sterically bulky isophthalate and long-spanning dipyridylamide ligands

• Cobalt or nickel coordination polymers with 5-tert-butylisophthalate (tbip).
• Long-spanning bis(4-pyridylformyl)piperazine (bpfp) coligands.
• Final structure greatly dependent on specific hydrothermal synthetic conditions.
• 1D chains or ribbons, and extremely rare 3D 658 4T10 self-penetrated network.

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.

Hydrothermal reaction of cobalt or nickel nitrate with 5-tert-butylisophthalic acid (H2tbip) and bis(4-pyridylformyl)piperazine (bpfp) under varying synthetic conditions afforded 1D or 3D coordination polymers. {[Ni(tbip)(H2O)2(bpfp)]·2.25H2O}n (pictured), manifests an extremely rare 658 4T10 4-connected self-penetrated topology.Figure optionsDownload as PowerPoint slide