Near-Unity Quantum Yields for Intersystem Crossing and Singlet Oxygen Generation in Polymethine-like Molecules: Design and Experimental Realization

    Authors

    S. Webster; D. Peceli; H. Hu; L. A. Padilha; O. V. Przhonska; A. E. Masunov; A. O. Gerasov; A. D. Kachkovski; Y. L. Slominsky; A. I. Tolmachev; V. V. Kurdyukov; O. O. Viniychuk; E. Barrasso; R. Lepkowicz; D. J. Hagan;E. W. Van Stryland

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. Lett.

    Keywords

    EXCITED-STATE ABSORPTION; SQUARAINE DYES; 2-PHOTON ABSORPTION; SECTIONS; KINETICS; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary; Physics, Atomic, Molecular & Chemical

    Abstract

    The photophysical properties of two pairs of squaraine molecules where two oxygen atoms in a squaraine bridge are replaced with sulfur atoms are investigated. This substitution leads to an inversion of the lowest singlet pi-pi* electronic transition by an n-pi* transition, effectively reducing the energy difference between singlet and triplet states and significantly increasing the intersystem crossing efficiency without the use of "heavy atoms". Experimental results, in agreement with quantum chemical calculations, show near-unity values for triplet quantum yield and singlet oxygen generation quantum yield for sulfur-containing squaraines, which are potentially useful for two-photon photodynamic therapy.

    Journal Title

    Journal of Physical Chemistry Letters

    Volume

    1

    Issue/Number

    15

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    2354

    Last Page

    2360

    WOS Identifier

    WOS:000280711500024

    ISSN

    1948-7185

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