Surface-Induced Phase of Tyrian Purple (6,6 '-Dibromoindigo): Thin Film Formation and Stability
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10325219" target="_blank" >RIV/00216208:11320/16:10325219 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1021/acs.cgd.6b00104" target="_blank" >http://dx.doi.org/10.1021/acs.cgd.6b00104</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.cgd.6b00104" target="_blank" >10.1021/acs.cgd.6b00104</a>
Alternative languages
Result language
angličtina
Original language name
Surface-Induced Phase of Tyrian Purple (6,6 '-Dibromoindigo): Thin Film Formation and Stability
Original language description
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 oC, the well-known bulk structure forms, while at a substrate temperature of 50 oC, 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 oC; 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.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Crystal Growth and Design
ISSN
1528-7483
e-ISSN
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Volume of the periodical
16
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
3647-3655
UT code for WoS article
000379456700015
EID of the result in the Scopus database
2-s2.0-84978945219