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

Abstract

Using 2D grids of [Cd(btx)₂Cl₂]_n1 and [Co(btx)₂Cl₂]_n2 (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 {[Cd₂(btx)₂(tp)₂]·H₂O}_n3 and [Co₃(btx)₄(tp)₃(H₂O)₄]_n4 (tp = terephthalic ion) with Schläfli symbols (4²³·6⁵) and (4⁴·6²)(4⁸·6⁷), 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.