8.2.5 Detection of Zn2+ Ions Using a Novel Chemosensor Based on Coumarin Schiff-base Derivatives by Electrochemical and Fluorescence Spectroscopy
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- 8.2 Electrochemical Sensors II
- B. Narakathu, M. Atashbar - Department of Electrical and Computer Engineering, Western Michigan University (USA), F. Abebe, C. Eribal, E. Sinn - Department of Chemistry, Western Michigan University (USA)
- 690 - 693
We report on the dual detection of zinc ions (Zn2+), using a novel coumarin-based fluorescent chemosensor 7-(diethylamino)-3-((2-hydroxy-4-methylphenylimino) methyl)-2H-chromen-2-one (DHMMC), by using electrochemical and fluorescence based spectroscopy techniques. An efficient electrochemical sensor which consists of gold (Au) interdigitated electrodes (IDE) on a glass substrate was used to perform electrical impedance spectroscopy (EIS) for quantitative detection of Zn2+. Picomolar level detection of Zn2+ was made possible by EIS in the presence of DHMMC. Selective detection of Zn2+ for concentrations as low as 1 μM was facilitated by fluorescence titration spectroscopy, based on the bathochromatic shift of the different optical signals produced in the emission spectra. The EIS and fluorescence based response were analyzed and is presented in this work.