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首页> 外文期刊>Chemistry: A European journal >Tetraphenylethene-Based Conjugated Fluoranthene: A Potential Fluorescent Probe for Detection of Nitroaromatic Compounds
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Tetraphenylethene-Based Conjugated Fluoranthene: A Potential Fluorescent Probe for Detection of Nitroaromatic Compounds

机译：基于四苯乙烯的共轭荧蒽：潜在的荧光探针，用于检测硝基芳族化合物

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摘要

This study reports the synthesis and photophysical properties of a star-shaped, novel, fluoranthene-tetraphenylethene (TFPE) conjugated luminogen, which exhibits aggregation-induced blue-shifted emission (AIBSE). The bulky fluoranthene units at the periphery prevent intramolecular rotation (IMR) of phenyl rings and induces a blueshift with enhanced emission. The AIBSE phenomenon was investigated by solvatochromic and temperature-dependent emission studies. Nanoaggregates of TFPE, formed by varying the water/THF ratio, were investigated by SEM and TEM and correlated with optical properties. The TFPE conjugate was found to be a promising fluorescent probe towards the detection of nitroaromatic compounds (NACs), especially for 2,4,6-trinitrophenol (PA) with high sensitivity and a high Stern-Volmer quenching constant. The study reveals that nanoaggregates of TFPE formed at 30 and 70% water in THF showed unprecedented sensitivity with detection limits of 0.8 and 0.5ppb, respectively. The nanoaggregates formed at water fractions of 30 and 70% exhibit high Stern-Volmer constants (K-sv=79998 and 51120m(-1), respectively) towards PA. Fluorescence quenching is ascribed to photoinduced electron transfer between TFPE and NACs with a static quenching mechanism. Test strips coated with TFPE luminogen demonstrate fast and ultra-low-level detection of PA for real-time field analysis.
机译：这项研究报告星形，新颖的，荧蒽-四苯乙烯（TFPE）共轭的发光剂的合成和光物理性质，其表现出聚集诱导的蓝移发射（AIBSE）。外围的庞大的荧蒽单元阻止了苯环的分子内旋转（IMR），并导致蓝移并增强了发射。通过溶剂变色和与温度有关的发射研究研究了AIBSE现象。通过SEM和TEM研究了通过改变水/ THF比形成的TFPE纳米聚集体，并与光学性质相关。发现TFPE共轭物是用于检测硝基芳族化合物（NAC）的有前途的荧光探针，特别是对于2,4,6-三硝基苯酚（PA）具有高灵敏度和高Stern-Volmer猝灭常数的检测。研究表明，在THF中30％和70％的水中形成的TFPE纳米聚集体显示出空前的灵敏度，检测限分别为0.8和0.5ppb。在30％和70％的水含量下形成的纳米聚集体对PA表现出较高的Stern-Volmer常数（分别为K-sv = 79998和51120m（-1））。荧光猝灭归因于具有静态猝灭机制的TFPE和NAC之间的光诱导电子转移。涂有TFPE发光剂的测试条证明了PA的快速和超低水平检测，用于实时现场分析。

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