ArticleChemistryOpen2026
A Systematic Study of Auxochrome Effects on Fluorescence Under Conditions of Varying Temperature, pH, or Viscosity: Photo-induced electron transfer and Twisted Intramolecular Charge Transfer.
Article in ChemistryOpen, 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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Abstract
It is well understood that the intensity of light emission from fluorescent molecules is affected by numerous factors including the activity of nonradiative decay pathways. Prominent among these are two intramolecular processes-photoinduced electron transfer (PET) and twisted intramolecular charge transfer (TICT). However, the variation of these quenching pathways with environmental parameters has never been systematically studied. We combine eight amine auxochromes with three fluorogenic cores to produce a matrix of 24 compounds and then examine their fluorescence while varying temperature, pH, or viscosity. We show that the activity of both PET and TICT is increased at higher temperatures, that PET can be blocked at low pH values while TICT is largely unaffected, and that increasing viscosity disrupts both pathways. This work will enhance our ability to design fluorescent molecules that are sensitive to key environmental parameters.
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