Surface-assisted transient displacement charge technique. I. Photoinduced charge transfer in self-assembled monolayers.
Surface-assisted transient displacement charge technique. I. Photoinduced charge transfer in self-assembled monolayers.
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表面辅助瞬态位移充电技术。
DOI：
10.1021/jp060757y
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Smirnov,SergeiN
中科院分区：
文献类型：
--
作者：
Krasnoslobodtsev,AlexeyV;Smirnov,SergeiN
为了研究表面结合分子中的光诱导电荷转移，发展了表面辅助光诱导瞬态位移电荷（SPTDC）技术，并将其应用于7-二乙基氨基香豆素和2，4-二硝基苯胺的自组装单分子膜的研究。由SPTDC测得的偶极矩变化与标准PTDC技术和半经验计算在溶液中测得的偶极矩变化相当好。在荧光和偶极子测量中观察到由于受激发射的表面固定的香豆素的激发态寿命的缩短。偶极信号在低极性溶剂中的下降表明偶极-偶极相互作用的重要性，该相互作用导致分子在光激发时重新取向。
Surface-assisted photoinduced transient displacement charge (SPTDC) technique was developed in order to study light-induced charge transfer in surface-bound molecules and applied to investigation of self-assembled monolayers of 7-diethylaminocoumarin and 2,4-dinitrophenylamine. The dipole moment change measured by SPTDC correlates reasonably well with that measured in solution by standard PTDC technique and with semiempirical calculations. Shortening of the excited-state lifetime of surface-immobilized coumarin due to stimulated emission was observed in both fluorescence and dipole measurements. The dipole signal decline in low-polarity solvents indicates the importance of dipole−dipole interaction that causes reorientation of molecules upon photoexcitation.