Photostable and strongly fluorescent pyrazolines have been prepared by introduction of various substituents into the pyrazoline (see Figure) and phenyl rings. The fluoro-substituted derivative (R1 = R2 = R3 = F; R4 = CF3) is shown to be a state-of-the-art substance in terms of luminescent efficiency and photostability.
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MATSUBARA et al. (2002) studied this question.