One- and two-photon singlet oxygen generation with new fluorene-based photosensitizers

    Authors

    S. J. Andrasik; K. D. Belfield; M. V. Bondar; F. E. Hernandez; A. R. Morales; O. V. Przhonska;S. Yao

    Comments

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    Abbreviated Journal Title

    ChemPhysChem

    Keywords

    luminescence; photochemistry; photosensitizer; singlet oxygen; two-photon absorption; PHOTODYNAMIC THERAPY; ZINC PHTHALOCYANINE; MOLECULAR-OXYGEN; ABSORPTION; DERIVATIVES; SENSITIZERS; STATE; WATER; CHROMOPHORES; Chemistry, Physical; Physics, Atomic, Molecular & Chemical

    Abstract

    The, spectral properties of new fluorene-based photosensitizers for efficient singlet oxygen production are investigated at room temperature and 77 K. Two-photon absorption (2PA) cross-sections of the fluorene derivatives are measured by the open aperture Z-scan method. The quantum yields of singlet oxygen generation under one- and two-photon excitation (Phi(Delta) and (2PA)Phi(Delta,) respectively), are determined by the direct measurement of singlet oxygen luminescence at approximate to 1270 nm. The values of Phi(Delta) are independent of excitation wavelength, ranging from 0.6-0.9. The singlet oxygen quantum yields under two-photon excitation are (2PA)Phi(Delta) approximate to 1/2 Phi(Delta), indicating that the two processes exhibit the some mechanism of singlet oxygen production, independent of the mechanism of photon absorption.

    Journal Title

    Chemphyschem

    Volume

    8

    Issue/Number

    3

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    399

    Last Page

    404

    WOS Identifier

    WOS:000244496200007

    ISSN

    1439-4235

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