Structure extending and cation exchange of Cd(II) and Co(II) materials compounds inducing fluorescence signal mutation

Using 2D grids of [Cd(btx)(2)Cl-2](n) 1 and [Co(btx)(2)Cl-2](n) 2 (btx = 1,4-bis(triazol-1-ylmethyl)benzene) as parent complexes, with terminal dicarboxylic ions as anion substitutors and bridge ligands, we synthesized extended structures of 3D polymeric networks with {[Cd-2(btx)(2)(tp)(2)]center dot H2O}(n) 3 and [Co-3(btx)(4)(tp)(3)(H2O)(4)](n) 4 (tp - terephthalic ion) with Schlafli symbols (4(23).6(5)) and (4(4).6(2))(4(8).6(7)), respectively. The complete cation exchanged products Cu2+-1, Cu2+-3 and Cd2+-4 were obtained by immersing 1, 3 and 4 into corresponding aqueous solutions of MCl2 (M = Cu2+ or Cd2+). Interestingly, fluorescence studies on the pre- and post-exchanged materials compounds indicate that central metal ions have great influence on the fluorescence signal of the materials compounds, and play more important roles than skeleton structures.