Diverse interpenetration schemes and topologies in cobalt coordination polymers constructed from 2-carboxycinnamic acid and a long-spanning dipyridylpiperazine ligand

Hydrothermal reaction of cobalt nitrate, 2-carboxycinnamic acid (H2cca), and a long-spanning dipyridyl-type ligand resulted in three coordination polymers that manifested different structural topologies and interpenetration schemes. The 1D chain coordination polymer [Co(dibf)2(4-bpfp)(H2O)2]n (3, dibf = 3-dihydro-3-oxo-1-isobenzofuranacetate) was formed by the in situ rearrangement of 2-carboxycinnamic acid to produce the anionic lactone dibf.163