Journal of Fluorescence ( IF 2.6 ) Pub Date : 2022-11-23 , DOI: 10.1007/s10895-022-03068-0 Shouvik Bhuin 1 , Manab Chakravarty 1
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The generation of solid-state emitters is a challenge due to the intrinsic aggregation-caused quenching feature of the fluorophores. A conformationally twisted pyridyl π-conjugate as a solid-state emitter is appended with well-known and inexpensive poly(methylmethacrylate) [PMMA] to afford a handy, portable, and reusable solid-state emitting polymer matrix. Entrapment of the probe is noticed through non-covalent interactions, resulting in a green-emitting platform. It quickly accepts a proton upon acid vapor exposure and switches emission from green to red with a significant 107 nm redshift. This shift is reversible with red to green emissions while exposed to base vapor. Thus, polymer-blended, homogeneous red-emitting pyridyl salt is employed as potential material to detect various basic vapors optically. Among different bases, naked-eye detection of essential analytes such as ammonia vapor and melamine shows potential demands. Hence, we have established an easy detection of ammonia vapor and aqueous melamine as low as 2.5 and 0.126 ppm, respectively, using this solid-state emitter that displays an emission color change with an enhancement of emission intensity even in an aqueous solution.
Graphical Abstract
中文翻译：
使用荧光团附加聚合物基质对水中的氨蒸气和三聚氰胺进行肉眼光学识别
由于荧光团固有的聚集引起的猝灭特性，固态发射器的产生是一个挑战。构象扭曲的吡啶基 π 共轭物作为固态发射体，附加有众所周知且廉价的聚（甲基丙烯酸甲酯）[PMMA]，以提供方便、便携且可重复使用的固态发射聚合物基质。通过非共价相互作用注意到探针的捕获，从而产生绿色发射平台。它在暴露于酸蒸汽后迅速接受质子，并将发射光从绿色切换为红色，并具有显着的 107 nm 红移。当暴露于基础蒸汽时，这种转变是可逆的，红色到绿色发射。因此，聚合物混合的均匀发红光的吡啶盐被用作光学检测各种基本蒸气的潜在材料。在不同的基地中，氨蒸气和三聚氰胺等基本分析物的肉眼检测显示出潜在需求。因此，我们已经建立了一种简单的检测氨蒸气和三聚氰胺水溶液的方法，分别低至 2.5 和 0.126 ppm，使用这种固态发射器，即使在水溶液中也能显示发射颜色变化和发射强度增强。
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