Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 212, Issue 1, Pages 27-35Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2010.03.008
Keywords
Quantum dots; Low symmetry phthalocyanine; Fluorescence lifetime; Forster resonance energy transfer; Triplet quantum yield; Triplet lifetime; Singlet oxygen
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Funding
- Department of Science and Technology (DST)
- National Research Foundation (NRF), South Africa through DST/NRF Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology
- Andrew Mellon Foundation
- NRF
- Rhodes University
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The linkage of a low symmetry phthalocyanine, ZnttbIPc to mercaptopropionic acid (MPA) capped CdTe quantum dots has been achieved using a coupling agent, dicyclohexylcarbodiimide (DCC), to facilitate formation of an amide bond. UV-vis, Raman and IR spectroscopic studies on the linked (QD:ZnttbIPc-linked) conjugate suggest the reaction was a success. Forster resonance energy transfer (FRET) resulted in stimulated emission of ZnttbIPc in both the linked (QD:ZnttbIPc-linked) and mixed (QD:ZnttbIPc-mixed) conjugates. The linked complex (QD:ZnttbIPc-linked) gave the largest FRET efficiency hence showing the advantages of covalent linking. Photophysicochemical properties of the phthalocyanine were improved in the presence of the QDs i.e. for QD:ZnttbIPc-mixed. Fluorescence lifetimes of QDs were unchanged in QD:ZnttbIPc-mixed and decreased for QD:ZnttbIPc-linked. (C) 2010 Elsevier B.V. All rights reserved.
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