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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–p–A dipole molecule with obvious intramolecular charge transfer (ICT) properties. |
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2樓2014-10-12 22:27:27
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★
團子小姐: 金幣+8, 翻譯EPI+1, ★★★★★最佳答案, 謝謝 2014-10-13 12:01:20
團子小姐: 金幣+8, 翻譯EPI+1, ★★★★★最佳答案, 謝謝 2014-10-13 12:01:20
| 所需的發(fā)光體TPA-CO由Ullmann反應(yīng)方便制得，產(chǎn)率超過74％。如圖S1†，所示，隨著溶劑極性升高，由非極性的甲苯上升到高極性乙腈，發(fā)射峰強烈依賴于溶劑的極性，顯示一種明顯的紅移作用。在高極性介質(zhì)中熒光強度也明顯減小。此外，圖S2†顯示，最高被占分子軌道（HOMO）水平的電子云主要集中在供電子單元的芳基胺; 然而，那些最低未占據(jù)分子軌道（LUMO）水平大多分布于電子接受性的二苯甲酮。這些結(jié)果表明，發(fā)光體TPA-CO是一種D-P-A偶極分子，具有明顯的分子內(nèi)電荷轉(zhuǎn)移（ICT）特性。 |
3樓2014-10-13 06:42:52
4樓2014-10-14 15:45:21
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