Epitaxial growth of polycyclic aromatic dyes on oriented polyethylene films

Tanabe, Katsutoshi; Shiojiri, Makoto

doi:10.1016/s0143-7208(96)00070-8

Cited by 1 publication

(3 citation statements)

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“…Note that epitaxial growth of Tyrian purple on polyethylene single crystals results in a different orientation with the (010) plane of Tyrian purple parallel to (110) of polyethylene. 35 …”

Section: Resultsmentioning

confidence: 99%

“…Note that epitaxial growth of Tyrian purple on polyethylene single crystals results in a different orientation with the (010) plane of Tyrian purple parallel to (110) of polyethylene. 35 The first peak in the other series of peaks corresponds to an interplanar distance of 15.2 Å, where higher-order reflections are also observed (labeled as surface induced phase (SIP) in Figure 2; arrows indicate the peak positions) and cannot be explained by any known polymorph. This peak series is also indexed by 00L, since the observed interplanar distance of the Bragg peaks is comparable to the bulk structure.…”

Section: ■ Resultsmentioning

confidence: 99%

“…The preferred orientation reveals that the molecules are standing at the substrate surface, however, with a tilt angle of ∼40° with respect to the surface normal (the van der Waals length of the molecule is 17.8 Å). Note that epitaxial growth of Tyrian purple on polyethylene single crystals results in a different orientation with the (010) plane of Tyrian purple parallel to (110) of polyethylene …”

Section: Resultsmentioning

confidence: 99%

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Surface-Induced Phase of Tyrian Purple (6,6′-Dibromoindigo): Thin Film Formation and Stability

Truger

Roscioni

Röthel

et al. 2016

Crystal Growth & Design

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The appearance of surface-induced phases of molecular crystals is a frequently observed phenomenon in organic electronics. However, despite their fundamental importance, the origin of such phases is not yet fully resolved. The organic molecule 6,6′-dibromoindigo (Tyrian purple) forms two polymorphs within thin films. At growth temperatures of 150 °C, the well-known bulk structure forms, while at a substrate temperature of 50 °C, a surface-induced phase is observed instead. In the present work, the crystal structure of the surface-induced polymorph is solved by a combined experimental and theoretical approach using grazing incidence X-ray diffraction and molecular dynamics simulations. A comparison of both phases reveals that π–π stacking and hydrogen bonds are common motifs for the intermolecular packing. In-situ temperature studies reveal a phase transition from the surface-induced phase to the bulk phase at a temperature of 210 °C; the irreversibility of the transition indicates that the surface-induced phase is metastable. The crystallization behavior is investigated ex-situ starting from the sub-monolayer regime up to a nominal thickness of 9 nm using two different silicon oxide surfaces; island formation is observed together with a slight variation of the crystal structure. This work shows that surface-induced phases not only appear for compounds with weak, isotropic van der Waals bonds, but also for molecules exhibiting strong and highly directional hydrogen bonds.

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“…Note that epitaxial growth of Tyrian purple on polyethylene single crystals results in a different orientation with the (010) plane of Tyrian purple parallel to (110) of polyethylene. 35 …”

Section: Resultsmentioning

confidence: 99%

Section: ■ Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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