Anion-induced structural transformation of a sulfate-incorporated 2D Cd(II)-organic framework

Li Wei Lee, Tzuoo Tsair Luo, Chih Min Wang, Gene Hsiang Lee, Shie Ming Peng, Yen Hsiang Liu, Sheng Long Lee, Kuang Lieh Lu

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9 Scopus citations


A Cd(II)-organic framework {[Cd2(tpim)4(SO4)(H2O)2]·(SO4)·21H2O}n (1) was synthesized by reacting CdSO4·8/3H2O and 2,4,5-tri(4-pyridyl)imidazole (tpim) under hydrothermal conditions. A structural analysis showed that compound 1 adopts a layered structure in which the [Cd(tpim)2]n chains are linked by sulfate anions. These 2D layers are further packed into a 3D supramolecular framework via π-π interactions. The structure contains two types of SO42- anions, i.e., bridging SO42- and free SO42- anions, the latter of which are included in the large channels of the framework. Compound 1 exhibits interesting anion exchange behavior. In the presence of SCN- anions, both the bridging and free SO42- anions in 1 were completely exchanged by SCN- ligands to form a 1D species [Cd(tpim)2(SCN)2] (1A), in which the SCN- moieties function as a monodentate ligand. On the other hand, when compound 1 was ion exchanged with N3- anions in aqueous solution, the bridging SO42- moieties remained intact, and only the free guest SO42- were replaced by N3- anions. The gas adsorption behavior of the activated compound 1 was also investigated.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Solid State Chemistry
StatePublished - 1 Jul 2016


  • Anion exchange
  • Cadmium
  • Crystal structure
  • Structural transformations
  • Sulfate


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