A Ratiometric Fluorescence Probe for Detecting Gaseous Isocyanates Directly

doi:10.6023/A18120484

Acta Chimica Sinica ›› 2019, Vol. 77 ›› Issue (4): 365-370.DOI: 10.6023/A18120484 Previous Articles Next Articles

Special Issue: 分子探针、纳米生物学与生命分析化学

Article

一种可用于直接检测空气中异氰酸酯的比率型荧光探针

陈凯, 韩百川, 嵇思鑫, 孙瑾, 高振忠, 侯贤锋

华南农业大学材料与能源学院木材科学与工程系广州 510640

投稿日期:2018-12-04 发布日期:2019-01-31
通讯作者: 高振忠, 侯贤锋 E-mail:zzgaoscau@163.com;xfhou@scau.edu.cn
基金资助:
项目受广东省自然科学基金（No.2018A030310348）和广州市科技计划（No.201803030031）资助.

A Ratiometric Fluorescence Probe for Detecting Gaseous Isocyanates Directly

Chen Kai, Han Baichuan, Ji Sixin, Sun Jin, Gao Zhenzhong, Hou Xianfeng

South China Agricultural University, College of Material and Energy, Guangzhou 510640

Received:2018-12-04 Published:2019-01-31
Contact: 10.6023/A18120484 E-mail:zzgaoscau@163.com;xfhou@scau.edu.cn
Supported by:
Project supported by the Natural Science Foundation of Guangdong Province, China (No. 2018A030310348), and the Guangzhou Science and Technology Plan (No. 201803030031).

1. A Ratiometric Fluorescence Probe for Detecting Gaseous Isocyanates Directly.PDF(2166KB)

Abstract

Isocyanates is a widely-used chemical in many manufacturing industries, such as polymer industry, pharmaceutical production and production of a variety of agricultural chemicals. However, it is harmful to human health due to the volatility. Therefore, it is necessary to develop methods to detect isocyanates quickly and conveniently, especially to gaseous isocyanates. In this work, a novel fluorescent probe, N-buty-4-hydroxy-1,8naphthalimide, was developed for detection of isocyanates. This fluorescence probe can be synthesized by a simple three-steps synthetic route, and the overall yield of the whole synthesizing process reached 75%. In the absence of isocyanate, the probe solution displays an emission centering at 596 nm when excited at 370 nm, which is yellow to the naked eye. Once isocyanate is added, the fluorescence of solution changes from yellow to blue, and the process finishes in 4 min. The detecting limit of this probe to isocyanates is calculated to be 112 nmol·L^-1. It is also proved that this probe possesses excellent selectivity for isocyanate and distinct anti-interference to common organic volatilized compounds. In addition, the reaction mechanism between the probe and isocyanate were proved by HPLC, NMR and ESI-MASS. Results show that the hydroxy group on the 4th position of naphthalene ring of probe reacts with isocyanate group (-NCO) of isocyanate, and resulting in carbamates, which alter 4th substituent group of probe molecule and lead to change of fluorescence. In order to detect the gaseous isocyanates directly, test paper are developed based on N-buty-4-hydroxy-1,8naphthalimide. When the test paper exposed to isocyanates vapor, the yellow fluorescence fade away gradually and a blue fluorescence appear in 6 min. And the test paper possesses excellent selectivity for gaseous isocyanate and distinct anti-interference to common VOCs. In conclusion, this strategy is an efficient way to detect gaseous isocyanates, and it may provide a referable approach for directly monitoring the volatile organic compounds in air.

Key words: isocyanates, fluorescence probe, testing paper

Cite this article

Chen Kai, Han Baichuan, Ji Sixin, Sun Jin, Gao Zhenzhong, Hou Xianfeng. A Ratiometric Fluorescence Probe for Detecting Gaseous Isocyanates Directly[J]. Acta Chimica Sinica, 2019, 77(4): 365-370.

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一种可用于直接检测空气中异氰酸酯的比率型荧光探针

A Ratiometric Fluorescence Probe for Detecting Gaseous Isocyanates Directly

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