Abstract
The on-surface synthesis of boroxine-containing molecules can be a convenient method of introducing specific functionalities. Here, we show the validity of a previously described synthesis protocol on the Au (111) surface by applying it to a different molecular precursor. We study in detail the assembly of the precursor, highlighting possible intermediate stages of the condensation process. We combine scanning tunneling microscopy and X-ray spectroscopies to fully characterize both the morphology and the electronic properties of the system. DFT calculations are presented to assign the main electronic transitions originating the B K-edge absorption spectrum. The study paves the way to a facile strategy for functionalizing a surface with molecules of tailored sizes and compositions.
Highlights
On-surface synthesis of 2D organic structures is a convenient bottom-up approach for tailoring both the chemistry and the morphology of surfaces and for the synthesis of complex hybrid interfaces of potential interest in the development of organic based devices [1,2,3,4,5]
We recently explored the latter possibility with the synthesis of triphenyl boroxine molecule on the Au(111) surface, which was obtained by sublimation of the phenyl boronic acid precursor under ultra-high vacuum conditions [16]
We have shown that the interaction between boroxine and Au(111) surfaces is characterized by the presence of interface electronic states, which represent preferential channels for ultrafast charge delocalization
Summary
On-surface synthesis of 2D organic structures is a convenient bottom-up approach for tailoring both the chemistry and the morphology of surfaces and for the synthesis of complex hybrid interfaces of potential interest in the development of organic based devices [1,2,3,4,5]. Whereas the condensation of molecules with two boronic groups allows for obtaining extended 2D structures, the use of single-terminated precursors leads to the formation of boroxine-containing molecular moieties.
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