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Published on: January 27, 2013
Effective fluorescent chemosensors for the detection of Zn²+ metal ion
J Jayabharathi1, V Thanikachalam, K Jayamoorthy
1Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India. jtchalam2005@yahoo.co.in
Abstract:
Benzimidazole derivatives synthesized from three components assembling condensation reaction behaves as a selective fluorescent sensor for Zn(2+) metal ion. These benzimidazole derivatives were characterized by (1)H, (13)C NMR, mass and elemental analysis. XRD analysis was carried out for 1-(4-methylbenzyl)-2-p-tolyl-1H-benzo[d]imidazole. The increase in the fluorescence enhancement can be explained on the basis of photo induced electron transfer (PET) mechanism. The blockage of the photoinduced electron transfer process from benzimidazole ring to aryl fluorophore induced by Zn(2+) co-ordination induced emission enhancement.
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When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

