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- W2029895786 abstract "The UV absorption and fluorescence characteristics of new optical probes based on a 1,3,5-triazinylaniline chromophore and of general structure p-Et2NC6H4C3N3(Cl)NR1R2 are reported. Increase in alkanol solvent polarity strongly quenches the fluorescence by a process attributed to TlCT (twisted intramolecular charge-transfer) state formation with co-operative solvent relaxation (log kNR/s–1 8.5–10.5). In aqueous media no changes in fluorescence band position or intensity are observed in the pH range 3.5 to 11 but below pH 3.5 protonation of the anilino nitrogen (pKaca. 2.4) eliminates both the λ= 360 nm absorption band and the weak λ= 460 nm fluorescence band. Free and hydrogen-bonded species, with respect to the anilino nitrogen centre, are present in aqueous dioxane solutions." @default.
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- W2029895786 date "1991-01-01" @default.
- W2029895786 modified "2023-10-17" @default.
- W2029895786 title "Triazinylaniline derivatives as fluorescence probes. Part 1. Absorption and fluorescence in organic solvents and in aqueous media in relation to twisted intramolecular charge-transfer state formation, hydrogen bonding, and protic equilibria" @default.
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- W2029895786 doi "https://doi.org/10.1039/p29910001495" @default.
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