Modulating supramolecular Pt⋯Pt interactions and π–π stacking for high-contrast mechanochromic and vapochromic materials

Abstract

A platinum(II) complex (Pt-PF) with bis(imidazolyl)pyridine ligands was synthesized, and its photophysical properties were comprehensively characterized. Two distinct forms of Pt-PF (Y-Pt-PF and R-Pt-PF) exhibiting different colors and structural arrangements were identified. Modulated supramolecular Pt⋯Pt interactions and π–π stacking patterns make the yellow Y-Pt-PF to red R-Pt-PF transformation occur under mechanical grinding or exposure to CH₃CN or MeOH vapors demonstrating high-contrast mechanochromic and vapochromic properties.