Recent Progress of Mechanofluorochromism and Mechanoluminescence for Phenothiazine Derivatives and Analogues.

Mechanofluorochromism (MFC) and mechanoluminescence (ML) materials have garnered significant attention from researchers due to their potential applications in anti-counterfeiting, optical recording, photodynamic therapy, bioimaging, stress sensing, display technology, and ink-free printing paper. Among the various building blocks utilized in these materials, phenothiazine (PTZ) has emerged as a widely employed fundamental component owing to its distinctive electronic and optical properties as well as its facile modification capabilities. Summarizing the recent progress of PTZ derivatives and analogues in this field holds practical significance. In this review article, we classify over one hundred compounds into a few classes based on the positions of substituents and provide detailed descriptions of their contributions to MFC and ML research respectively. This comprehensive review aims to offer theoretical insights and practical examples for researchers engaged in designing and developing new phenothiazine functional materials while serving as a bridge for further exploration of MFC or ML studies.