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The desired luminophor TPA-CO was prepared conveniently by an Ullmann reaction with yields over 74%. As depicted in Fig. S1,† as the solvent polarity increased from nonpolar toluene to highly polar acetonitrile, the emission peaks strongly depend on the solvent polarity, revealing an evident bathochromic effect. The fluorescence intensity was also obviously reduced in highly polar media. Additionally, Fig. S2† shows that electron clouds of the highest occupied molecular orbital (HOMO) levels were mainly concentrated on the electrondonating arylamine units; however, those of lowest unoccupied molecular orbital (LUMO) levels were mostly spread to the electron-accepting benzophenone. These results showed that luminophor TPA-CO was a D¨Cp¨CA dipole molecule with obvious intramolecular charge transfer (ICT) properties. |
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