On the basis of a
temperature-induced effect, the solvothermal reaction of Co(Ac)2·4H2O, 5-amino-2,4,6-triiodoisophthalic acid
(H2atibdc), and 1,4-bis(2-methyl-imidazol-1-yl)butane (bib)
at 80 °C gave a new coordination polymer [Co(bib)(atibdc)]
(1), which shows a two-dimensional (2D) network with
left- and right-handed helical chains. By raising the reaction temperature
to 130 °C, a pair of homochiral enantiomers [Co(bib)(atibdc)]·2H2O (2, 2M, and 2P) were
successfully obtained, displaying a three-dimensional (3D) framework
with three kinds of unique helical chains. Keeping the temperature
of the reaction system to 150 °C, excited, an in situ iodine
elimination reaction occurred, and a new linker 5-aminoisophthalic
acid (H2aipa) was generated, which then cooperated with
the bib ligand to construct a coordination polymer [Co(bib)(aipa)]
(3), showing a 3D 3-fold interpenetrating architecture.
The comparison of final solid structures exhibits an exclusive temperature-induced
effect on the construction of the coordination polymer. Furthermore,
via a single-crystal-to-single-crystal (SCSC) transformation, the
2D network of 1 can be derived from the 3D framework
of 2, which presents a rare type of temperature-solvent
induced SCSC transformation. In addition, the magnetic properties
of 1–3 have been investigated as
well.