Reversible photoluminescence switching behavior and luminescence thermochromism of copper(I) halide cluster coordination polymers

Abstract

Two novel coordination polymers [Cu₃I₄(C₁₆H₃₂N₄)]·ClO₄ (1) and [Cu₆I₆Br₂(C₁₆H₃₂N₄)(CH₃CN)₂] (2) (C₁₆H₃₂N₄·2Br⁻ = 4-Aza-1-azoniabicyclo-[2.2.2]octane, 1,1′-(1,4-butanediyl)bis-dibromide) have been synthesized under solvothermal conditions. At room temperature, compounds 1 (Φ = 46.2%) and 2 (Φ = 26.62%) show strong photoluminescence in solid state. At low temperature, compound 1 displays obvious thermochromic luminescence while compound 2 has no obvious change which can be observed by naked eye. However, compound 2 displays a interesting phenomenon. The luminescence of compound 2 is reversible when the coordinated CH₃CN molecules in structure are removed by heat and recovered from acetonitrile solvent.