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Cd(II)-Coordination Framework: Synthesis, Anion-Induced Structural Transformation, Anion-Responsive Luminescence, and Anion Separation

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journal contribution
posted on 18.03.2013 by Shan Hou, Qi-Kui Liu, Jian-Ping Ma, Yu-Bin Dong
A series of Cd­(II) coordination frameworks that are constructed from a new oxadiazole-bridged ligand 3,5-bis­(3-pyridyl-3-(3′-methyl­phenyl)-1,3,4-oxadiazole (L) and CdX2 (X = NO3, Cl, Br, I, N3, and SCN) were synthesized. The NO3 anion of the solid Cd­L2­(NO3)2·2THF (1) is able to be quantitatively exchanged with Cl, Br, I, SCN, and N3 in the solid state. For Cl and Br, the anion exchange resulted in a anion-induced structural transformation to form the structures of 2 and 3, respectively. In addition, the Cd­(II) structure herein exhibits the anion-responsive photoluminescence, which could be a useful method to monitor the anion-exchange process. Notably, compound 1 can recognize and completely separate SCN/N3 with similar geometry.