Abstract
A number of trans-stilbene derivatives containing 2-pyrazolinyl and 1,3-oxazolyl groupings were synthesized by PO olefination from 1-(4-formylphenyl)-3-aryl-5-phenyl-2-pyrazolines and 2-(4-bromomethylphenyl)-5-phenyl-1,3-oxazole. The products fluoresce intensely in the green or yellow-green region (quantum yields 0.4–0.57). The intense long-wave absorption band of the investigated compounds is due to an electron transition that is localized primarily in the stilbene fragment of their molecules that includes, as a substituent, the amine nitrogen atom of the pyrazoline ring; the less intense shortwave band corresponds to localization of the electronic excitation in the hydrazone grouping.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 656–661, May, 1977.
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Krasovitskii, B.M., Kutulya, L.A., Shevchenko, A.E. et al. Synthesis and spectral luminescence properties of stilbene derivatives containing 2-pyrazolinyl and 1,3-oxazolyl groupings. Chem Heterocycl Compd 13, 532–537 (1977). https://doi.org/10.1007/BF00473202
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DOI: https://doi.org/10.1007/BF00473202