Selective turn-on fluorescence for Zn and Zn + Cd metal ions by single Schiff base chemosensor |
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Authors: | P.S. Hariharan Savarimuthu Philip Anthony |
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Affiliation: | School of Chemical & Biotechnology, SASTRA University, Thanjavur 613401, Tamil Nadu, India |
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Abstract: | Chemosensor based on Schiff base molecules (1, 2) were synthesized and demonstrated the selective fluoro/colorimetric sensing of multiple metal ions (Mn2+, Zn2+ and Cd2+) in acetonitrile–aqueous solution. Both 1 and 2 showed a highly selective naked-eye detectable colorimetric change for Mn2+ ions at 10−7 M. Fluorescence sensing studies of 1 and 2 exhibited a strong fluorescence enhancement (36 fold) selectively upon addition of Zn2+ (10−7 M, λmax = 488 nm). Fluorescence titration and single crystal X-ray analysis confirmed the formation of 1:1 molecular coordination complex between 1 and Zn2+. Interestingly, a rare phenomenon of strong second turn-on fluorescence (190 fold, λmax = 466 nm) was observed by the addition of Cd2+ (10−7 M) into 1 + Zn2+ or Zn2+ (10−7 M) into 1 + Cd2+. Importantly both 1 and 2 exhibited different fluorescence λmax with clearly distinguishable color for both Zn2+ and Cd2+. |
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Keywords: | Chemosensor Fluorescence sensor Schiff base Colorimetric sensor Multiple metal ions sensor |
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