Add time:07/20/2019         Source:sciencedirect.com

2,5-DISTYRYLPYRAZINE (cas 14990-02-4) (DSP) was evaporated onto a cleavage face of KCl crystal in vacuo. The DSP film vacuum-evaporated on the KCl substrate without heat treatment was composed of randomly-oriented laminate and needle-like crystallites of α-form. When the substrate was heated at 150°C before vacuum evaporation and kept at 30°C during deposition, the DSP film was composed of slender needle-like crystallites of γ-form and flaky crystallites of α-form. The longitudinal direction of the γ-form crystals was aligned along the [100] and [010] directions of the KCl substrate. The faces of the α-form crystals made an angle of 10° with respect to the [100] and [010] directions of the KCl substrate. At the substrate temperature of 70°C, the DSP film grew epitaxially on the substrate to form thin plate-shaped crystals of γ-form. The DSP molecule took three kinds of orientations on the KCl substrate depending on the evaporation conditions: (100)α-form∥(001)KCl, (010)α-form∥ (001)KCl and [100]γ-form⊥(001)KC l. These orientations are discussed in terms of the dehydroxylation of the KCl surface caused by the thermal treatment and of the adsorption energy of the DSP molecules.

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