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- W2088333012 abstract "The fluorescence excitation spectra and fluorescence quantum yields of some azastilbenes as a function of the excitation wavelenth λex are reported and compared to the behaviour of the corresponding hydrocarbon. The compounds with the heteroatom in the meta position with respect to the ethylenic bridge display an anomalous behaviour in that their fluorescence yield has a minimum value when λex is near 290 nm. The anomaly, which disappears on protonation, is attributed to an hidden absorption to an upper excited singlet state whose decay path by-passes the fluorescent S1 state. A recent potential-energy model proposed for stilbene is modified to explain the wavelength dependence of the fluorescence yield as well as some preliminary results on trans → cis photoisomerization" @default.
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- W2088333012 date "1977-05-01" @default.
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- W2088333012 title "An anomalous effect of the excitation energy on the fluorescence of azastilbenes" @default.
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- W2088333012 doi "https://doi.org/10.1016/0009-2614(77)85036-7" @default.
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