Singlet Oxygen Quantum Yield Determination for a Fluorene-Based Two-Photon Photosensitizer |
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| Authors: | Kevin D. Belfield Mykhailo V. Bondar Olga V. Przhonska |
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| Affiliation: | (1) Department of Chemistry and College of Optics and Photonics, CREOL and FPCE, University of Central Florida, P.O. Box 162366, Orlando, Florida 32816-2366, USA;(2) Institute of Physics, Prospect Nauki, 46 Kiev-28, 03028 Kiev, Ukraine |
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| Abstract: | The quantum yield, ΦΔ, of singlet oxygen generation under two-photon excitation has been determined for a fluorene derivative. A photochemical method was developed using 1,3-diphenylisobenzofuran (DPBF), a chemical quencher of 1O2, and 2-(9,9-didecyl-7-nitrofluoren-2-yl)benzothiazole (1) as a two-photon photosensitizer (PS). The photochemical kinetics of the quencher was measured by two different fluorescence methods. Fluorene 1 exhibited relatively high singlet oxygen quantum yield, ΦΔ ≈ 0.4 ± 0.1, and had a two-photon absorption cross-section of 28 ± 5 GM. Thus, 1 may have potential for use as a two-photon PS in the near-IR spectral region for biomedical applications. |
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| Keywords: | Singlet Oxygen Photosensitizer Two-Photon Fluorene |
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