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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 8, p.748-757

    Paper

Bondar M.V.1, Przhonska O.V.1, Kachkovsky O.D.2, Frazer A.3, Morales A.R.3, Belfield K.D.3

1 Institute of Physics
(46, Prosp. Nauky, Kyiv 03028, Ukraine)
2 Insitute of Organic Chemistry
(5, Murmanskaya Str., Kyiv 03094, Ukraine)
3 Department of Chemistry, University of Central Florida
(P.O. Box 162366, Orlando, FL 32816-2366, USA)

New Fluorene-Based Fluorescent Probe with Efficient Two-Photon Absorption

Section: Solid matter
Original Author's Text: English

Abstract: The synthesis, linear photophysical characterization, and two-photon absorption (2PA) properties of new fluorene derivative 3,3'-(pyridine-2,6-diyl)bis(1-(7-(diphenylamino)-9,9-dihexyl- 9H-fluoren-2-yl)propane-1,3-dione) (1) have been presented. The steady-state absorption, fluorescence and excitation anisotropy spectra along with the fluorescence decay kinetics of 1 are obtained in the solvents of different polarities at room temperature with respect to its potential application in bioimaging. The analysis of linear photophysical properties revealed a complicated nature of the main one-photon absorption band of 1, and the strong solvatochromic effect in steady-state fluorescence spectra is observed. The degenerate 2PA spectrum of 1 is measured in the spectral range 570–970 nm with the use of the open aperture Z-scan method under the 1-kHz femtosecond excitation, and the maximum values of two-photon action cross sections ?(100–130) GM are obtained. The nature of the linear absorption and the 2PA bands is analyzed by quantum chemical methods using a Gaussian program package.

Key words: two-photon absorption, fluorene, Z-scan method.