Title

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

Authors

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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