High photoluminescent TPA and the ratiometric sensor for free chlorine
High photoluminescent TPA and the ratiometric sensor for free chlorine
复制标题
高光致发光 TPA 和游离氯比率传感器
DOI：
10.1016/j.snb.2017.01.070
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发表时间：
2017-06-01
影响因子：
8.4
通讯作者：
Chi, Yuwu
中科院分区：
文献类型：
--
作者：
Fang, Qingqing;Wang, Qian;Chi, Yuwu
以柠檬酸和L-半胱氨酸为原料，通过“一步”缩合反应合成了3，5-二氢-5-氧代-2H-噻唑并[3，2-a]吡啶-3，7-二甲酸（TPA）。首次采用简单结晶法对TPA分子进行了纯化，并研究了TPA的光致发光（PL）性质。纯化后的TPA呈现明亮的蓝色荧光，荧光量子产率高达90.5%。TPA分子中的硫原子可被游离氯选择性氧化成亚砜，亚砜是一种强吸电子基团。结果，共轭降低，导致大的PL猝灭。在此基础上，研制了一种灵敏、选择性好的光致发光传感器，用于游离氯的检测。此外，三（2，2-联吡啶）氯化钌（II）六水合物（其红色PL信号对游离氯是惰性的）可用于提供背景PL信号。据此，研制了一种便于现场和在线检测游离氯的可见光比例传感器。(C)2017爱思唯尔B. V.保留所有权利。
A facile and high yield method is introduced to synthesize 3,5-dihydro-5-oxo-2H-thiazolo[3,2-a]pyridine-3,7-dicarboxylic acid (TPA) through the "one-step" condensation reaction of citric acid and L-cysteine. For the first time, the produced TPA molecules are purified by the simple crystallization, and the photoluminescence (PL) properties of the TPA are investigated. The obtained purified TPA shows bright blue PL, with a PL quantum yield as high as 90.5%. The sulfur atom of TPA molecule can be selectively oxidized by free chlorine into sulfoxide, which is a strong electron withdrawing group. As a result, the conjugation is decreased, leading to a great PL quenching. On the basis, a sensitive and selective PL sensor is developed for the detection of free chlorine. Furthermore, tris(2,2-bipyridine)ruthenium(II) chloride hexahydrate, whose red PL signal is inert to the free chlorine, can be used to provide a background PL signal. Thus, a visual PL ratiometric sensor is developed, which is convenient for the on-site and on-line detection of free chlorine. (C) 2017 Elsevier B.V. All rights reserved.