Highly selective and sensitive fluorescence reporter for toxic Hg(II) ion by a synthetic symmetrical azine derivative
✍ Scribed by Sasanka Dalapati; Bijan Kumar Paul; Sankar Jana; Nikhil Guchhait
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 578 KB
- Volume
- 157
- Category
- Article
- ISSN
- 0925-4005
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✦ Synopsis
1,2-a]pyridine-2ylmethylene hydrazine Hg 2+ recognition Chelation enhanced fluorescence (CHEF) Density Functional Theory (DFT) a b s t r a c t A symmetrical azine derivative, N,N -Bis(imidazo[1,2-a]pyridine-2-ylmethylene hydrazine (sensor L) has been synthesized and its fluorescence sensing potential towards metal ions has been demonstrated using simple fluorometric technique. The sensor shows high fluorescence selectivity and high sensitivity towards Hg 2+ ion in aqueous-methanol media. Only Hg 2+ ion is found to effectively enhance fluorescence quantum yield of the nearly non-fluorescent sensor. The sensor can effectively distinguish Hg 2+ from Cd 2+ or Zn 2+ ion within the same group via different mechanistic pathway i.e. chelation enhanced fluorescence (CHEF) effect for Hg 2+ ion and charge transfer (CT) mechanism for Cd 2+ or Zn 2+ ion. Experimental spectral properties have been correlated with theoretical calculation based on Density Functional Theory method.