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Issue 8, 2018
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Synthesis and photophysical properties of BODIPY-decorated graphene quantum dot–phthalocyanine conjugates

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Abstract

This work reports on the synthesis and characterisation of novel supramolecular hybrids containing BODIPY-decorated graphene quantum dots (BODIPY@GQDs) and zinc phthalocyanine. Graphene quantum dots (GQDs) were functionalized with L-glutathione (GSH) in order to assist coupling to the BODIPY dye. {2,9(10)16(17)23(24)-Tetrakis-[3-(diethylamino)phenoxy]phthalocyaninato}zinc(II) (1) was immobilized via π–π stacking interaction on the BODIPY-decorated GQDs and pristine GQDs to form the supramolecular hybrids 1-BODIPY@GQDs and 1-GQDs, respectively. The photophysical and photochemical properties of these conjugates were investigated. Energy transfer occurred from the (i) GQDs to BODIPY, (ii) GQDs to 1, and (iii) BODIPY@GQDs to 1via fluorescence resonance energy transfer (FRET). The highest FRET efficiency was observed for the BODIPY@GQDs (0.93). The introduction of the BODIPY core to the GQD structure resulted in higher triplet, and singlet oxygen quantum yields for the resultant Pc/GQD hybrid (1-BODIPY@GQDs). The zeta potential values obtained imply a high colloidal stability for the supramolecular hybrids. The results suggest that such hybrids may be applied in fields such as photodynamic therapy (PDT), where a high singlet oxygen quantum yield is desired.

Graphical abstract: Synthesis and photophysical properties of BODIPY-decorated graphene quantum dot–phthalocyanine conjugates

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Publication details

The article was received on 14 Feb 2018, accepted on 27 Feb 2018 and first published on 27 Feb 2018


Article type: Paper
DOI: 10.1039/C8NJ00758F
Citation: New J. Chem., 2018,42, 6051-6061
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    Synthesis and photophysical properties of BODIPY-decorated graphene quantum dot–phthalocyanine conjugates

    N. Nwahara, R. Nkhahle, B. P. Ngoy, J. Mack and T. Nyokong, New J. Chem., 2018, 42, 6051
    DOI: 10.1039/C8NJ00758F

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