Journal
DOKLADY PHYSICAL CHEMISTRY
Volume 481, Issue -, Pages 95-99Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0012501618070023
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Funding
- Federal Agency of Scientific Organizations [01201361875]
- Russian Foundation for Basic Research [18-34-00607 mol_a]
- Basic Research Program of the Presidium of the RAS Nanostructures: Physics, Chemistry, Biology, Fundamentals of Technologies
- project Basic Research of Generation of Active Radical Particles upon Photoexcitation of Highly Organized Systems Based on Nanostructures (Fullerenes, Nanotubes, Quantum Dots) and Dyes to Develop Efficient Photosensitizers for Medicine
- project Water-Soluble Fullerene-Containing Nanostructures as a Basis for the Development of Efficient Radioprotective Drugs for a Wide Spectrum of Applications
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Free fluorescence spectra in solution and surface-enhanced Raman scattering (SERS) and surface enhanced fluorescence (SEF) spectra of chlorin e6 and water-soluble covalent fullerene-chlorin dyads have been studied. It has been demonstrated that chlorin e6 and covalent fullerene-chlorin dyads have similar characteristic SERS spectra. The fullerene-chlorin dyads show a pronounced SEF signal, while native chlorin e6 has no fluorescence on surface, which is consistent with the theory predicting an inverse dependence of the SEF intensity on the free fluorescence quantum yield. The concentration dependence of the SEF intensity is linear for the dyads in the range 0.1-2.0 mu mol/L. These effects allow one to determine, with high sensitivity, the content of fullerene-chlorin dyads with a low quantum yield of free fluorescence in solutions, which opens wide opportunities for study of biological properties of fullerene-chlorin dyads and their applications in medicine.
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