作者:Alan R. Katritzky、Megumi Yoshioka-Tarver、Bahaa El-Dien M. El-Gendy、C. Dennis Hall
DOI:10.1016/j.tetlet.2010.12.082
日期:2011.4
GFP chromophore analogs (7a–e, 8, and 10a,b) containing 2-thienyl-, 5-methyl-2-furyl-, 2-pyrryl, and 6-methyl-2-pyridyl-groups were synthesized and their fluorescence spectra recorded in the pH range 1–7. NMR studies showed that protonation of 8 (2-thienyl system) inhibited photoisomerization (Z–E) about the exocyclic double bond but that protonation of 7c (E + Z) (2-pyrryl system) gave only 7cE. Fluorescence
合成了含有2-噻吩基,5-甲基-2-呋喃基,2-吡咯基和6-甲基-2-吡啶基的GFP生色团类似物(7a – e,8和10a,b)在1–7的pH范围内记录。NMR研究表明,8(2-噻吩基系统)的质子化抑制了环外双键的光异构化(Z - E),但7c(E + Z)(2-吡啶基系统)的质子化仅产生7cE。荧光研究表明,荧光强度增强了7c和7b,低于pH 2.5的e(呋喃基系统),低于pH 6的10a(吡啶基系统)得到相似的结果。pH1时的量子产率很低,这可能是由于激发态质子转移(ESPT)所致。