A series of Aga coordination polymers,. {Ag2LAg-1/2(ONO)(2)(NO2)(1/2)(H2O)}(n) (1), {AgL(BF4)}(n) (2), and {Ag2L2(ClO4)(2)}(n) (3), have been prepared by assembly of AgX (X- = NO2-, BF4-, and ClO4-) with 3,4-bis(2-pyridy1)-5-(4-pyridy1)-1,2,4-triazole (L). Single-crystal X-ray diffraction analyses indicate that 1-3 show distinct two-dimensional networks and 'lattice stacking, with the counteranions Ag-1/2(ONO)(2)(NO2)(1/2)(2-), BF4-, and ClO4- located in the interlayered voids. Interestingly, when the crystals of 1 were immersed in a water solution of BF4- or ClO4- anion, 2 or 3 can be irreversibly formed via anion-driven structural transformation. This process has also been investigated by means of PXRD, elemental analysis, FT-IR, and SEM-EDS, revealing a solvent-mediated mechanism. Moreover, the dynamic anion-exchange behavior is highly anion selective but cation-independent.
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