Chem. Commun., 2025, Accepted Manuscript DOI: 10.1039/D5CC04485E, Communication Zhongyong Xu, Caiqiang Liao, Immanuel David Charles, Tianyi Qin, Bin Liu A dual-state-emission fluorescent probe undergoes H2O2-triggered structural transformation, producing a distint color change from yellow to red in both aqueous media and living cells