Scanning tunneling microscopy and spectroscopy of donor-acceptor-donor triads at the liquid/solid interface.
Scanning tunneling microscopy and spectroscopy of donor-acceptor-donor triads at the liquid/solid interface.
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DOI：
10.1002/cphc.200500241
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
H. Uji‐i;Atsushi Miura;Atsushi Miura;A. Schenning;E. Meijer;Zhijian Chen;F. Würthner;F. Schryver;M. Auweraer;S. D. Feyter
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文献类型：
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作者：
H. Uji‐i;Atsushi Miura;Atsushi Miura;A. Schenning;E. Meijer;Zhijian Chen;F. Würthner;F. Schryver;M. Auweraer;S. D. Feyter
利用扫描隧道显微镜（STM）研究了两种有机给体-受体-给体三元组（给体为低聚对苯乙炔（OPV），受体为苝酰亚胺（PDI））及其混合物在液/固界面上的自组装.这两个三元组的取代基的性质不同，因此，在中央的二萘嵌苯二酰亚胺单元（H或Cl）的氧化还原性能。由于亚分子分辨率，单元的不同的电子性质，在一个三元组和两个三元组之间，反映在偏置依赖的成像实验中的相对STM对比度。此外，扫描隧道光谱揭示了一个逆整流行为的OPV和H-取代的PDI单元，这是讨论的准共振隧穿的框架。一个显着的差异是观察Cl-取代的三元组。
By means of scanning tunneling microscopy (STM), the self-assembly of two organic donor-acceptor-donor triads (donor=oligo(p-phenylene vinylene) (OPV); acceptor=perylene diimide (PDI)) and their mixtures has been investigated at the liquid/solid interface. Both triads differ in the nature of the substituents and, therefore, in the redox properties of the central perylene diimide unit (H or Cl). Thanks to the submolecular resolution, the distinct electronic properties of the units, within a triad and between the two triads, are reflected by the relative STM contrast in the bias-dependent imaging experiments. Moreover, scanning tunneling spectroscopy reveals an inverse rectifying behavior of the OPV and H-substituted PDI units, which is discussed in the framework of quasi-resonant tunneling. A striking difference is observed for the Cl-substituted triad.