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Colorimetric and fluorescent sensing of a new FRET system via [5]helicene and rhodamine 6G for Hg2+ detection†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1039/c7nj04129b
Anuwut Petdum 1, 2, 3, 4 , Waraporn Panchan 4, 5, 6 , Jitnapa Sirirak 1, 2, 3, 4 , Vinich Promarak 4, 7, 8 , Thanasat Sooksimuang 4, 5, 6 , Nantanit Wanichacheva 1, 2, 3, 4
Affiliation  

A “visually colorimetric” and fluorometric sensor based on [5]helicene connected to rhodamine 6G via a hydrazide moiety, RG5H, was designed and prepared for the highly sensitive and selective detection of Hg2+. The sensor system operated through the FRET process from the [5]helicene energy donor to the ring-opened rhodamine 6G–Hg2+ complex acceptor. The sensor illustrated a very large Stokes shift up to 176 nm. In aqueous acetonitrile solutions, RG5H exhibited high selectivity and sensitivity toward Hg2+ in the presence of various competitive metal ions, such as Cu2+, Ag+, Zn2+, Pb2+, Ca2+, Cd2+, Co2+, Fe2+, Mg2+, Mn2+, Ba2+, Ni2+, Na+, Li+ and K+. The detection limit of RG5H for determination of Hg2+ was found to be 2.3 ppb. The binding of RG5H to Hg2+ was evident in both fluorescence enhancement as well as a colorimetric change in the sensor from greenish-yellow to orange, which could be easily observed by the naked eye.

中文翻译:

通过[5] ic烯和若丹明6G进行Hg 2+检测 ,对新的FRET系统进行比色和荧光传感

设计并制备了一种基于[5]螺旋的“目视比色”和荧光传感器,该传感器通过酰肼部分RG5H与若丹明6G连接,用于Hg 2+的高灵敏度和选择性检测。传感器系统通过FRET过程进行操作,从[5]螺旋烯供体到开环的若丹明6G–Hg 2+复合受体。传感器显示出非常大的斯托克斯位移,最大可达176 nm。在乙腈水溶液中,在各种竞争性金属离子(例如Cu 2 +,Ag +,Zn 2 +,Pb 2+)存在下,RG5H对Hg 2+表现出高选择性和敏感性。,Ca 2 +,Cd 2 +,Co 2 +,Fe 2 +,Mg 2 +,Mn 2 +,Ba 2 +,Ni 2 +,Na +,Li +和K +。发现用于测定Hg 2+RG5H的检出限为2.3 ppb。RG5H与Hg 2+的结合在荧光增强和传感器的色度变化(从绿黄色到橙色)中均很明显,这可以通过肉眼轻松观察到。
更新日期:2018-01-04
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