Colorimetric and fluorescent sensing of a new FRET system via [5]helicene and rhodamine 6G for Hg2+ detection

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...

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Veröffentlicht in:New journal of chemistry 2018-01, Vol.42 (2), p.1396-1402
Hauptverfasser: Petdum, Anuwut, Panchan, Waraporn, Jitnapa Sirirak, Promarak, Vinich, Sooksimuang, Thanasat, Wanichacheva, Nantanit
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Sprache:eng
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Zusammenfassung: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.
ISSN:1144-0546
1369-9261
DOI:10.1039/c7nj04129b