Summer Research Fellowship Programme of India's Science Academies

New Fluorescent Chemosensor Probe for Selective Detection of Cu(II) and Fe(II/III)via Florescence Turn on- off Mechanism

Shaik Bajibaba

Mahatma Gandhi University Nalgonda, Nalgonda 508001, Telangana, India.

Dr. Kaushik Ghosh

Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.


The development of chemical sensors for metal ions in aqueous solution and non aqueous solution has been of increasing importance due to their potential applications in many disciplines such as biochemistry, clinical and medical sciences, cell biology, analytical chemistry, and environmental sciences. Among different chemosensors, the fluorescence-based ones attract particular interest because of their high selectivity, sensitivity, low cost, simplicity. Copper and iron are the most essential trace elements in the human body. Copper is usually present at low levels in biological systems, although it plays vital roles in several physiological and pathological processes. A new Schiff base based chemosensor was synthesized by condensation of m-phenalinediamine and two equivalent of p-vanillin. This Schiff base L was characterized by UV-visible, IR, 1HNMR and 13CNMR spectral studies. This Schiff base based chemosensor exhibited fluorescent property upon excitation at 310 nm showing a fluorescent band around 530 nm. Change of fluorescent property was investigated in the presence of different metal ions like Cu2+, Zn2+, Fe2+, Fe3+, Mn2+, Mg2+, Ni2+, Co2+, Pb2+, Ba2+, Hg2+, Na+, Sn2+, Pb2+ and Cd2+. Quenching of fluorescence was observed in the presence of Cu2+, Fe2+and Fe3+ ions. Other metal ions such as Cu2+, Zn2+, Fe2+, Fe3+, Mn2+, Mg2+, Ni2+, Co2+, Pb2+, Ba2+, Hg2+, Na+, Sn2+, Pb2+ and Cd2+ showed almost no significant fluorescent intensity enhancement. These results suggest that selective detection of copper and iron ions by chemosensor via fluorescence turn on/off mechanism.

Keywords: Fluorescent Probe, Schiff base, Copper Sensing, Iron Sensing, Fluorescence Turn on-off mechanism.

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