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Interaction of CdTe Quantum Dots with 2,2-Diphenyl-1-Picrylhydrazyl Free Radical: A Spectroscopic, Fluorimetric and Kinetic Study

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Abstract

The interaction of 2,2-diphenyl-1-picrylhydrazyl (DPPH●) free radical with thiol-capped CdTe quantum dots (QDs) has been studied by UV–vis spectroscopy, steady state and time resolved fluorescence measurements. Addition of DPPH● radical to CdTe QDs resulted in fluorescence quenching. The interaction occurs through static quenching as this was confirmed by fluorescence lifetime measurements. Time course absorption studies indicates that DPPH● may be reduced by interaction with QDs to the substituted hydrazine form (2,2-diphenyl-1-picrylhydrazine) DPPH-H. The mechanism of fluorescence quenching of CdTe QDs by DPPH● is proposed.

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Acknowledgements

This work was supported by the Department of Science and Technology (DST) and National Research Foundation (NRF), South Africa through DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology as well as Rhodes University and DST/Mintek Nanotechnology Innovation Centre (NIC) – Sensors, South Africa.

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  1. Department of Chemistry, Rhodes University, Grahamstown, 6140, South Africa

    Oluwasesan Adegoke, Wadzanai Chidawanyika & Tebello Nyokong

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  1. Oluwasesan Adegoke
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  2. Wadzanai Chidawanyika
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  3. Tebello Nyokong
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Correspondence to Tebello Nyokong.

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Adegoke, O., Chidawanyika, W. & Nyokong, T. Interaction of CdTe Quantum Dots with 2,2-Diphenyl-1-Picrylhydrazyl Free Radical: A Spectroscopic, Fluorimetric and Kinetic Study. J Fluoresc 22, 771–778 (2012). https://doi.org/10.1007/s10895-011-1012-2

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  • DOI: https://doi.org/10.1007/s10895-011-1012-2

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