1. Colorimetric detection of Cu(II): Cu(II)-induced deprotonation of NH responsible for color change.
- Author
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Kao, Shao-Lun, Lin, Wan-Ying, Venkatesan, Parthiban, and Wu, Shu-Pao
- Subjects
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COPPER compounds , *COLORIMETRIC analysis , *PROTON transfer reactions , *AMMONIA , *COLOR change sensors , *METAL ions , *LIGANDS (Chemistry) - Abstract
Chemosensor 1 detects only the presence of Cu 2+ ions among other metal ions through a color change from pale yellow to green. 1 functions as a tridentate ligand that binds Cu 2+ ions through three amine nitrogen functional groups. In the presence of Cu 2+ , 1 provided significant color change, while Ag + , Ca 2+ , Cd 2+ , Co 2+ , Fe 2+ , Fe 3+ , Hg 2+ , Mn 2+ , Ni 2+ , Pb 2+ , and Zn 2+ metal ions produced only minor changes in UV–vis absorption. The association constant ( K a ) for Cu 2+ binding to 1 had a value of 1.307 × 10 3 M −1 . The maximum absorption change induced by Cu 2+ binding to the chemosensor was observed over the pH range 6.0–10.0. A new band observed at 600 nm indicated the formation of deprotonated 1 –Cu 2+ complexes. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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