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The coverage dependent formation of ordered structures in vapor deposited 2,4′-bis(terpyridine)derivatives (2,4′-BTP) on (111) oriented Ag films was investigated by STM. Following a two-dimensional (2D) disordered gas phase at lowest coverages, a sequence of at least three ordered structures is observed with increasing coverage. These include a ‘parallel chain structure’ (PCS), a ‘quasi-quadratic network’ (QQN) structure, and a ‘packed windmill structure’ (PWS), with ideal coverages of 0.37, 0.4, and 0.44 molecules nm−2. At intermediate coverages between 0.37 and 0.44 molecules nm−2, these structures coexist in larger islands. The energetics of the different phases, whose structures are mainly determined by attractive C–HN bridges, are discussed in a picture including C–HN and C–HH–C interactions and lateral variations in the substrate–adsorbate interactions.
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Physical Chemistry Chemical Physics
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