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The preparation of functionalized nonplanar aromatics and study of their physical properties at nanoscale
Mildner, Daniel ; Starý, Ivo (advisor) ; Pfleger, Jiří (referee)
The Thesis studies single-molecule conductance of helicenes by means of scanning tunneling microscopy-based break-junction (STM-BJ) device. Particularly, it focuses on a question how the conductance of helicenes changes with the increased number of aromatic rings. Firstly, Introduction about helicenes is given, namely their syntheses, properties, and applications. Further, methods of single molecule analysis, namely scanning tunneling microscope and break-junction techniques, are discussed with emphasis on organic molecules and their conductance. In the next part, Results and discussion, the synthesis of helicenes is presented and their single-molecule conductance is studied. Through STM-BJ measurements, decreasing trend in molecular conductance with increasing length of a molecular wire is proved. Above that, the correlation of experimental data with theoretical calculations and X-ray diffraction experiments confirms that a single-molecule conductance is measured. Finally, the Experimental section provides detailed description of experimental procedures both for organic and physical experiments.
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