化学
荧光团
发色团
质子化
荧光
光化学
分子内力
吸收带
生命科学中的荧光
接受者
水溶液
溶剂
溶剂效应
氢键
吸收(声学)
分子
激发态
物理化学
立体化学
有机化学
离子
物理
光学
量子力学
声学
作者
David J. Cowley,Eddie O'Kane,Richard S. Todd
出处
期刊:ChemInform
[Wiley]
日期:2010-08-22
标识
DOI:10.1002/chin.199201043
摘要
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.The triazinylaniline derivatives are prototypes of promising sensitive probes for organized media and as models of proteins labelled with the triazinylaniline fluorophore.
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