Journal
RSC ADVANCES
Volume 5, Issue 105, Pages 86463-86472Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra16301c
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Funding
- Ministry of Education, Science and Technology [NRF-2014R1A2A1A11051794, NRF-2015R1A2A2A09001301]
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A bi-functional colorimetric chemosensor 1, based on julolidine moiety and N-(2-aminoethyl)-5-nitropyridin-2-amine, has been synthesized and characterized. The sensor 1 has proven to be highly selective and sensitive to Cu2+ with a color change from colorless to yellow in aqueous solution. The sensing mechanism of 1 for Cu2+ was proposed to be the ligand-to-metal charge-transfer (LMCT), which was explained by theoretical calculations. It was also found that the 1-Cu2+ complex could be recycled simply through treatment with an appropriate reagent such as EDTA. Importantly, the sensor 1 could be used to detect and quantify Cu2+ in water samples. Moreover, 1 showed a selective colorimetric response toward fluoride due to the increase in the intramolecular charge transfer (ICT) band by a deprotonation process without any inhibition from other anions such as CH3COO- and CN-
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