Photophysical Properties and Ultrafast Excited-State Dynamics of a New Two-Photon Absorbing Thiopyranyl Probe

    Authors

    K. D. Belfield; M. V. Bondar; A. R. Morales; A. Frazer; I. A. Mikhailov;O. V. Przhonska

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    J. Phys. Chem. C

    Keywords

    STIMULATED-EMISSION DEPLETION; INTRAMOLECULAR CHARGE-TRANSFER; SINGLET; OXYGEN GENERATION; DENSITY-FUNCTIONAL THEORY; OPTICAL-DATA STORAGE; FLUORENE DERIVATIVES; ONE-PHOTON; ABSORPTION PROPERTIES; ENERGY-TRANSFER; SPECTROSCOPY; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

    Abstract

    Comprehensive linear photophysical and photochemical characterization, two-photon absorption (2PA) properties, and femtosecond excited-state dynamics of a symmetrical fluorene derivative 2-(2,6-bis((E)-2-(7-(diphenylamino)-9,9-dihexyl-9H-fluoren-7-yl)vinyl)-4H-thiopyran-4-ylidene)malononitrile (1) are reported. The linear one-photon absorption (IPA), steady-state fluorescence, excitation, and excitation anisotropy spectra of 1 were investigated in organic solvents of different polarities at room temperature, exhibiting rather complex absorption and emission behavior. The relatively strong 2PA of thiopyranyl 1 was investigated by the open aperture femtosecond Z-scan technique in the main long wavelength IPA contour with maxima cross sections up to 600-700 GM. Femtosecond dynamics of the excited-state absorption (ESA) and gain processes in 1 exhibited fast complicated relaxation phenomena with a strong dependence on solvent polarity and a weak dependence on excitation wavelength. The nature of the observed transient absorption kinetics was explained based on the short-lived ESA bands of 1 and solvate relaxation phenomena. Quantum chemical calculations, based on density functional theory, were employed for additional analysis of the IPA and 2PA properties of 1.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    117

    Issue/Number

    23

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    11941

    Last Page

    11952

    WOS Identifier

    WOS:000320640500006

    ISSN

    1932-7447

    Share

    COinS