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graphite (HOPG) under ambient conditions. Figure 8a
shows the large uniform and well-ordered assembly. It
is noticed that herringbone-shaped patterns are full of
the whole viewed area. The details of the adlayer can be
seen in a high-resolution STM image in Figure 8b. The
adjacent molecules in the same rows are parallel to each
other with a uniform bent direction. It is clear that the
bright rods consist of three parts: the central part is at-
tributed to the location of the PBI core part and the out-
ermost parts correspond to the OPE moieties. A pro-
posed model for the molecular arrangement could be
shown in Figure 7c according to the STM image. The
unit cell of the two dimensional (2D) assembly is su-
perimposed on the molecular model with parameters a
=2.0±0.1 nm, b=5.1±0.2 nm, α=70°±2°.
Conclusions
In conclusion, we have synthesized a new OPE-PBI-
OPE triad using the Sonogashira cross-coupling reaction.
The aggregation behavior has been investigated by
UV-vis absorption and fluorescent spectroscopy in
hexane and dichloromethane. The stronger aggregation
takes place in low-polarity hexane, when concentration
reaches 3×10−6 mol/L. Excitation of the OPE unit in
the triad results in photoinduced energy and electron
transfers. Excitation of the PBI unit in the triad can only
result in photoinduced electron transfer. Highly ordered
two-dimensional assemblies can be obtained at solid/
liquid interfaces.
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(Zhao, X.)
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