A luminescent supramolecular Cu2I2(NH3)2-sandwiched Cu3(pyrazolate)3 adduct as a temperature sensor

Abstract

A highly luminescent supramolecular Cu₂I₂(NH₃)₂-sandwiched Cu₃(pyrazolate)₃ adduct was reported as a temperature sensor. The adduct is stabilized by the synergy of intermolecular Cu₃⋯I (π acid⋯base), Cu⋯Cu and N⋯H interactions, to form a Cu₈I₂ cluster. The emission intensity exhibits a temperature-dependent effect in the solid state with a sensitivity of −0.685% K⁻¹. DFT and TDDFT calculations revealed that the luminescence originates from the triplet state of Cu₈I₂ cluster-centered charge transfer (³CC).