Steady-state and femtosecond transient absorption spectroscopy of new two-photon absorbing fluorene-containing quinolizinium cation membrane probes.
作者： Xiling Yue , Zach Armijo , Kevan King , Mykhailo V. Bondar , Alma R. Morales
DOI: 10.1021/AM508093P
关键词: Spectroscopy 、 Femtosecond 、 Ultrafast laser spectroscopy 、 Excited state 、 Two-photon absorption 、 Materials science 、 Absorption (electromagnetic radiation) 、 Hexafluorophosphate 、 Photochemistry 、 Fluorene
摘要: The synthesis, linear photophysical characterization, and nonlinear optical properties of two new symmetrical fluorene-containing quinolizinium derivatives, 2,8-bis((E)-2-(7-(diphenylamino)-9,9-dihexyl-9H-fluoren-2-yl)vinyl)quinolizinium hexafluorophosphate (1) 2,8-bis((E)-2-(7-((7-(diphenylamino)-9,9-dihexyl-9H-fluoren-2-yl)ethynyl)-9,9-dihexyl-9H-fluoren-2yl)vinyl)quinolizinium (2), are reported. nature the dual-band steady-state fluorescence emission 1 2 was determined, violation Kasha’s rule along with a strong dependence on solvent polarity were shown. A relatively complex structure two-photon absorption (2PA) spectra 2, maximum cross sections ∼400–600 GM, determined using open aperture Z-scan method. Different types fast relaxation processes characteristic times 0.3–0.5 ps 1.5–2 observed in excited states compounds via femtosecond transient pump–probe spectroscopy. To better unde...
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