Abstract
Temperature-tuned ordered monolayer growth of $\mathrm{N},{\mathrm{N}}^{\ensuremath{'}}$-di(n-butyl)quinacridone (DBQA) by organic molecular beam deposition on the $\mathrm{Ag}(110)$ surface has been investigated by means of low-energy electron diffraction and scanning tunneling microscopy (STM). Two kinds of the ordered monolayer structures, the substrate-induced commensurate and the intermolecular-interaction-induced incommensurate, were formed at the higher $(320\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ and lower $(260\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ growth temperatures, respectively. Our analysis clearly shows that the weak and strong hydrogen bonds (H bonds) are responsible for the intermolecular interactions in the two structures. The change in the strength of the H bond is induced by the temperature-dependent molecule-substrate interaction. The different molecular conformations in the two structures were also revealed by STM.
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