A fluorescent sensor based on quinazoline ketone derivatives for selectivity of Fe super(3+)

• Published in: International journal of environmental analytical chemistry 2015-05, Vol.95 (7), p.650-656
• Main Authors: Zhang, Zhengyu, Yuan, Ailin, Xu, Hong, Wang, Haibo, Zheng, Chunling, Weng, Yangyang, Bai, Yunning, Zhu, Qiuyun, Zhong, Bingju
• Format: Article
• Language: English
• ISSN: 0306-7319; 1029-0397
• DOI: 10.1080/03067319.2015.1036866

In this work, we provided a fluorescent sensor based on a compound containing fluorophore quinazoline ketone for detecting metal ions. 2-Methyl-4(3 H)-quinazoline thione was synthesised as a fluorescent probe for tervalent ferric ion (Fe super(3+)) detection. Fluorescent determination of 2-methyl-4(3 H)-quinazoline thione indicated its maximum emission wavelength of 306.5 nm. The fluorescence interference and titration experiments have shown that the compound has a high selective fluorescence response to Fe super(3+). With an increase in the Fe super(3+) ion concentration, the fluorescence emission strength gradually weakened, and a slight red shift appeared. With Job's method, 2-methyl-4(3 H)-quinazoline thione was proved to form a 1:2 complex with Fe super(3+). The results revealed that 2-methyl-4(3 H)-quinazoline thione could be used as a fluorescent probe for the recognition of Fe super(3+) with high selectivity.