Structure and Excitonic Coupling in Self-Assembled Monolayers of Azobenzene-Functionalized Alkanethiols

被引：104
作者：
Gahl, Cornelius [1 ]
Schmidt, Roland [1 ,2 ]
Brete, Daniel [1 ,2 ]
McNellis, Erik R. [3 ]
Freyer, Wolfgang [1 ]
Carley, Robert [1 ]
Reuter, Karsten [3 ]
Weinelt, Martin [1 ,2 ]
机构：
[1] Max Born Inst, D-12489 Berlin, Germany
[2] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany
[3] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 06期
关键词：
ABSORPTION; LIGHT; FILMS; GOLD; PHOTOISOMERIZATION; APPROXIMATION; TRANSMISSION; REFLECTION; MOLECULES; DYNAMICS;
D O I：
10.1021/ja903636q
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Optical properties and the geometric structure of self-assembled monolayers of azobenzene-functionalized alkanethiols have been investigated by UV/visible and near edge X-ray absorption fine structure spectroscopy in combination with density-functional theory. By attaching a trifluoro-methyl end group to the chromophore both the molecular tilt and twist angle of the azobenzene moiety are accessible. Based on this detailed structural analysis the energetic shifts observed in optical reflection spectroscopy can be qualitatively described within an extended dipole model This substantiates sizable excitonic coupling among the azobenzene chromophores as an important mechanism that hinders trans to cis isomerization in densely packed self-assembled monolayers.
引用
收藏
页码：1831 / 1838
页数：8
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