Cyclometalated platinum(ii) complex-based soft salt with multistimuli-responsive properties

Abstract

A soft salt, S, comprising two oppositely charged platinum(II) complexes, ([Pt(C_F2^N)(en)]⁺ and [Pt(C_Ph2^N)(CN)₂]⁻), was synthesized and characterized. Compound S exhibits photoluminescence in DMSO solution, emitting at 558 nm upon excitation at 414 nm, with a quantum yield of 0.49. In the solid state, when dispersed in a KBr matrix, a broad emission band centered at 658 nm is observed. The cationic and anionic components of S interact through electrostatic and van der Waals forces, leading to pronounced modifications of their luminescent behavior compared to their isolated counterparts. These include vapochromic responses, reversible photoluminescence quenching upon exposure to acid vapors, and thermally induced luminescence enhancement.