Title

Photophysical Properties And Ultrafast Excited-State Dynamics Of A New Two-Photon Absorbing Thiopyranyl Probe

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 (1PA), 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 1PA 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 1PA and 2PA properties of 1. © 2013 American Chemical Society.

Publication Date

6-13-2013

Publication Title

Journal of Physical Chemistry C

Volume

117

Issue

23

Number of Pages

11941-11952

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/jp4016454

Socpus ID

84879105040 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84879105040

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