Synthesis and fluorescence properties of six fluorescein-nitroxide radical hybrid-compounds
作者:Shingo Sato、Susumu Endo、Yusuke Kurokawa、Masaki Yamaguchi、Akio Nagai、Tomohiro Ito、Tateaki Ogata
DOI:10.1016/j.saa.2016.06.021
日期:2016.12
with DPROXYL-3-ylmethyl methanesulfonate (5). Fluorescence intensities (around 520nm) after reduction of the radical increased to 1.43-, 1.38-, and 1.61-folds for 2a, 2b and 3b respectively; 3a alone exhibited a decrease in intensity on reduction. Since 4 was readily solvolyzed in PBS or even methanol to afford fluorescein and 4-carboxy-TEMPO, its fluorescence change could not be measured. Hybrid compound
通过5-或6-羧基荧光素与4-氨基-TEMPO(2ab),5-或6-氨基荧光素和4的缩合反应,合成了六种荧光素-硝基氧自由基杂化化合物(2ab,3ab,4和5)。 -羧基-TEMPO(3ab),以及荧光素和4-羧基-TEMPO(4),或使荧光素的3-羟基与DPROXYL-3-基甲基甲磺酸酯反应(5)。自由基还原后的荧光强度(约520nm)分别为2a,2b和3b的1.43倍,1.38倍和1.61倍;单独的3a显示出还原强度降低。由于4容易溶于PBS或什至甲醇中以提供荧光素和4-羧基-TEMPO,因此无法测量其荧光变化。在荧光素酚和3-羟甲基-DPROXYL羟基中心之间包含醚键的杂化化合物5是稳定的,并且在还原时,