A superfluorescent fluorenyl probe with efficient two-photon absorption

Kevin D. Belfield, Mykhailo V. Bondar, Florencio E. Hernandez, Olga V. Przhonska, Xuhua Wang, Sheng Yao

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16 Scopus citations


The linear photophysical, excited state absorption (ESA), superfluorescence, and two-photon absorption (2PA) properties of 4,4′-(1E,1′E)-2,2′-(7,7′(1E,1′E)2,2′(4, 4′-sulfonylbis(4,1-phenylene))bis(ethane-2,1-diyl)bis(9, 9-didecy-9H-fluorene7,2-diyl))bis(ethane-2,1-diyl)bis(N,N-diphenylaniline) (1) were investigated in organic and aqueous media with respect to its potential application in biological imaging. The analysis of linear photophysical properties revealed a rather complex nature of the main one-photon absorption band, strong solvatochromic effects in the steady-state fluorescence spectra, single-exponential fluorescence decay, and high fluorescence quantum yields in organic solvents (≈1.0). The ESA spectra of 1 suggested potential for light amplification in nonpolar media while efficient superfluorescence in cyclohexane was demonstrated. The degenerate 2PA spectra of 1 were obtained over a broad spectral range (640-900 nm), using a standard two-photon induced fluorescence method under 1 kHz femtosecond excitation. Two well defined 2PA bands with maximum 2PA cross sections up to 1700 GM in the higher energy, short wavelength band and ≈1200 GM in the lower energy, long wavelength band of 1 were shown. The potential use of 1 in bioimaging was demonstrated via one- and two-photon in vitro fluorescence imaging of HCT 116 cells.

Original languageEnglish (US)
Pages (from-to)4303-4310
Number of pages8
JournalPhysical Chemistry Chemical Physics
Issue number10
StatePublished - Mar 14 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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