Cd(II)-Coordination Framework: Synthesis, Anion-Induced Structural Transformation, Anion-Responsive Luminescence, and Anion Separation
journal contributionposted on 18.03.2013, 00:00 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.