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Highly selective and sensitive optical probe for Fe3+ based on a water-soluble squarylium dye†
Analytical Methods ( IF 3.1 ) Pub Date : 2018-04-12 00:00:00 , DOI: 10.1039/c7ay02948a
Zongguang Xu 1, 2, 3, 4, 5 , Mengying Jiang 3, 4, 5, 6 , Chen Zhang 1, 2, 3, 4, 5 , Jinfeng Mei 3, 4, 5, 7 , Zhongyu Li 1, 2, 3, 4, 5 , Song Xu 1, 2, 3, 4, 5 , Liping Wang 3, 4, 5, 7
Affiliation  

A highly selective and sensitive water-soluble optical probe based on a squarylium dye, 2,3,3-trimethyl-3H-indolenine-5-sulfonate squaraine (SQ) has been successfully synthesized. The as-prepared SQ can efficiently recognize iron(III) ions in the presence of competing cations (Na+, Mg2+, Al3+, Cr3+, Zn2+, K+, Ca2+, Ba2+, Pb2+, Ni2+, Co2+, Ag+, Cu2+, Cd2+) in deionized water. After Fe3+ was added, the absorbance and fluorescence of the SQ water solution changed, and the color changed from sky blue to pale yellow. The binding constant (Ka) of SQ–Fe3+ was calculated to be about 1.14 × 104 M−1. Correspondingly, the chelating mode of SQ–Fe3+ was confirmed by Job's plot, Fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (1H NMR). “Naked eye” detection was performed, which indicated the potential application of SQ for convenient, selective and fast detection of Fe3+.

中文翻译:

基于水溶性方石英染料的 Fe 3+的高选择性和灵敏光学探针

已经成功合成了基于方酸染料2,3,3-三甲基-3 H-吲哚烯-5-磺酸方酸(SQ)的高选择性和灵敏的水溶性光学探针。所制备的SQ可以有效地识别铁(III在竞争阳离子(Na存在下)离子+,镁2+,铝3+,铬3+,锌2+,K +,钙2+,钡2+, Pb 2 +,Ni 2 +,Co 2 +,Ag +,Cu 2 +,Cd 2+)在去离子水中。添加Fe 3+后,SQ水溶液的吸光度和荧光发生变化,颜色从天蓝色变为浅黄色。SQ -Fe 3+的结合常数(K a)经计算约为1.14×10 4 M -1。相应地,乔布斯图,傅立叶变换红外光谱(FT-IR)和1 H核磁共振(1 H NMR)证实了SQ –Fe 3+的螯合模式。进行“裸眼”检测,表明SQ的潜在应用用于方便,选择性和快速地检测Fe 3+
更新日期:2018-04-12
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