Photoinduced electron-transfer in perylenediimide triphenylamine-based dendrimers:: single photon timing and femtosecond transient absorption spectroscopy

被引：35

作者：

Fron, Eduard ^{[1
,2
]}

Pilot, Roberto ^{[1
,2
]}

Schweitzer, Gerd ^{[1
,2
]}

Qu, Jianqiang ^{[3
]}

Herrmann, Andreas ^{[3
]}

Muellen, Klaus ^{[3
]}

Hofkens, Johan ^{[1
,2
]}

van der Auweraer, Mark ^{[1
,2
]}

De Schryver, Frans C. ^{[1
,2
]}

机构：

[1] Katholieke Univ Leuven, Dept Chem, B-3001 Heverlee, Belgium

[2] Katholieke Univ Leuven, Inst Nanoscale Phys & Chem, B-3001 Heverlee, Belgium

[3] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES | 2008年 / 7卷 / 05期

关键词：

D O I：

10.1039/b718479d

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The excited state dynamics of two generations perylenediimide chromophores substituted in the bay area with dendritic branches bearing triphenylamine units as well as those of the respective reference compounds are investigated. Using single photon timing and multi-pulse femtosecond transient absorption experiments a direct proof of a reversible charge transfer occurring from the peripheral triphenylamine to the electron acceptor perylenediimide core is revealed. Femtosecond pump-dump-probe experiments provide evidence for the ground state dynamics by populating excited vibronic levels. It is found by the means of both techniques that the rotational isomerization of the dendritic branches occurs on a time scale that ranges up to 1 ns. This time scale of the isomerization depends on the size of the dendritic arms and is similar both in the ground and excited state.

引用

页码：597 / 604

页数：8

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