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Journal of Fluorescence

, Volume 22, Issue 1, pp 391–395 | Cite as

A New Highly Sensitive and Selective Fluorescent Cadmium Sensor

  • Priyanka Goswami
  • Diganta Kumar Das
Original Paper

Abstract

Condensation product (L) of salicylaldehyde and semicarbazide behaves as a fluorescent sensor for Cd2+ ion, in 1:1 DMSO:H2O, over Mn2+, Fe2+, Ni2+, Co2+, Cu2+, Pb2+ and Hg2+ ions. The emission peak of L at λmax = 520 nm, on excitation with 420 nm wavelength photons, showed an enhancement in intensity of ca 60-fold when interacted with Cd2+ ion. The intensity was however found to remain unaltered when interacted with metal ions—Mn2+, Fe2+, Ni2+, Co2+, Cu2+, Pb2+ and Hg2+. The intensity increases by approximately 20 fold on interaction with Zn2+ ion. The increase in the fluorescent peak can be explained on the basis of photo induced electron transfer (PET) mechanism. A 1:1 complexation between Cd2+ and L with log β = 4.25 has been proved.

Keywords

Cadmium Salicylaldehyde Semicarbazide Fluorescence Sensor Photo induced electron transfer (PET) 

Notes

Acknowledgement

UGC and DST, New Delhi are thanked for SAP and FIST respectively. PG thanks UGC for fellowship under RFSMS.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of ChemistryGauhati UniversityGuwahatiIndia

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