The influence of the electronic structure of adsorbate-substrate complexes on photoisomerization ability
The influence of the electronic structure of adsorbate-substrate complexes on photoisomerization ability
复制标题
DOI：
10.1088/1367-2630/14/4/043023
复制
发表时间：
2012-04-19
影响因子：
3.3
通讯作者：
Tegeder, Petra
中科院分区：
文献类型：
--
作者：
Bronner, Christopher;Schulze, Michael;Tegeder, Petra
我们利用时间分辨双光子光发射技术研究了Au（111）表面的两个分子光开关，即偶氮苯及其衍生物四叔丁基偶氮苯（TBA）。发现位于底物-吸附界面的电子态是TBA光异构化的敏感探针。与TBA相反，偶氮苯在Au（111）表面失去了开关能力。除了两种分子的不同吸附几何外，我们还将偶氮苯的猝灭部分归因于相对于金d带的最高已占据分子轨道（HOMO）的移位，这使得参与TBA光异构化机制的空穴转移效率低下。
We use time-resolved two-photon photoemission to study two molecular photoswitches at the Au(111) surface, namely azobenzene and its derivative tetra-tert-butyl-azobenzene (TBA). Electronic states located at the substrate-adsorbate interface are found to be a sensitive probe for the photoisomerization of TBA. In contrast to TBA, azobenzene loses its switching ability at the Au(111) surface. Besides the different adsorption geometries of both molecules, we partly attribute the quenching in the case of azobenzene to a shift of the highest occupied molecular orbital (HOMO) with respect to the gold d-bands, which renders the hole transfer involved in the photoisomerization mechanism of TBA inefficient.