Phototautomerization in Pyrrolylphenylpyridine Terphenyl Systems
作者:Nikola Basarić、Suma S. Thomas、Vesna Blažek Bregović、Nikola Cindro、Cornelia Bohne
DOI:10.1021/acs.joc.5b00275
日期:2015.5.1
enhanced acidity of pyrrole (pKa* ≈ 8–9) enabling excited-state proton transfer (ESPT). ESPT gives rise to phototautomers and significantly quenches the fluorescence of 2–4. Phototautomers 2-T and 4-T were detected by LFP with strong transient absorption maxima at 390 nm. Phototautomers 2-T and 4-T decayed by competing uni- and bimolecular reactions. However, at pH 11 the decay of 4-T followed exponential