ArticleChemical science2026
Exploring the excited state mechanisms of a viscosity-sensitive zeromethine merocyanine dye emitter.
Article in Chemical science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
Merocyanine (MC) dyes are among the most versatile and tunable chromophores owing to their structural flexibility. However, their excited state dynamics, which often lead to fluorescence quenching by ultrafast non-radiative decay pathways such as photoisomerization or relaxation through conical intersections, are poorly understood for most MCs. Herein, we elucidate the excited state mechanisms of a zeromethine MC dye (PyBA), which represents a special case of the donor-acceptor architecture featuring two directly connected heterocycles. The analysis was achieved by combining steady-state measurements under varying temperature, viscosity and polarity conditions, time-resolved ultrafast spectroscopy, and quantum-chemical calculations. Our studies show that PyBA upon photoexcitation develops a twisted intramolecular charge transfer (TICT) state in dynamic environments (
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