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- W2046465719 abstract "The maximum absorption wavelengths (λa-max), absorption coefficient (ε), maximum emission wavelengths (λe-max), fluorescent quantum yields (φf), and second-order nonlinear polarizations (βxxx) of seventeen 4,4′-bis-(2-(substituted-styryl))biphenyl and three 1,4-bis-(2-(substituted-styryl))benzene were measured. The results showed that some of this series of compounds possess high fluorescent quantum yields in DMF, such as, 2 (0.801), 3 (0.680), 5 (0.565), 15 (0.538) 16 (0.848), 18 (2.175), 19 (1.314) and 20 (1.060), as compared with quinine-sulfuric acid. They could be used as fluorescent whiteners and fluorescent colorants. Some of these compounds were of a high βxxx values, such as in DMSO, 2 (29.00/10−30 m5 c−1), 3 (25.29/10−30 m5 c−1), 8 (21.79/10−30 m5 c−1) and 9 (24.08/10−30 m5 c−1). Electron-withdrawing substituent NO2, which is attached to the two terminal phenyl rings could cause λa-max obviously to be shorter, but it made λe-max change longer. Electron-donating substituent at two end benzene rings, such as OCH3, N((CH3)2), even Cl, could make λa-max and λe-max longer, and the larger the electron-donating ability of the substituent, the longer the λa-max and λe-max. This influence of 4-position substituent on λa-max or λe-max is obviously larger than that of 2-position substituent, and the action of substituent on 2-position is larger than that of substituent on 3-position. The values of λa-max and λe-max of biphenyl compounds 2 or 3 were respectively close to these values of corresponding benzene compounds 18 or 19." @default.
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- W2046465719 date "2003-07-01" @default.
- W2046465719 modified "2023-10-17" @default.
- W2046465719 title "Study on the optical properties of 4,4′-bis-(2-(substituted-styryl))biphenyl and 1,4-bis-(2-(substituted-styryl))benzene" @default.
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- W2046465719 doi "https://doi.org/10.1016/s1386-1425(03)00003-9" @default.
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