AI Article Synopsis
- - The study focuses on a polyaromatic molecule called Trima, designed to adsorb onto surfaces and allow for manipulation using a scanning tunneling microscope (STM).
- - Trima features a unique structure that binds to surfaces at both ends while enabling rotation of its central part when electrons are injected via the STM tip.
- - Experimental results confirmed Trima's adsorption on silicon surfaces, with individualized manipulations revealing dependencies on voltage and electronic transitions within the molecule.
Article Abstract
We have studied the adsorption of the polyaromatic molecule 1,4"-paratriphenyldimethylacetone, which we have nicknamed Trima. The originality of this linear molecule is that it was designed and synthesized to have two functionalities. First, chemisorb itself to the surface by its two ends rather like a bridge. Second, the central part of the molecule could then be rotated by injecting electrons with the tip of the scanning tunneling microscope (STM). The length of the molecule corresponds exactly to the spacing between five dimers in a row on the Si(100)-2 x 1 surface. We found that the molecule adsorbs as expected on the clean silicon surface by using complementary STM and synchrotron radiation studies. Manipulation of individual molecules with the STM tip showed selective internal modifications that were highly voltage dependent. These manipulations were found to be compatible with an electronic excitation of the pi-pi* transition of the molecule.
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| http://dx.doi.org/10.1063/1.1874972 | DOI Listing |
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