Abstract
The presence of a substrate-induced polymorph of 2,7-dioctyloxy[1]benzothieno[3,2-b]benzothiophene is probed in microscopic crystals and in thin films. Two experimental techniques are used: lattice phonon Raman and IR spectroscopy. The bulk crystal and substrate-induced phase have an entirely different molecular packing, and therefore, their Raman spectra are characteristic fingerprints of the respective polymorphs. These spectra can be unambiguously assigned to the individual polymorphs. Drop-cast and spin-coated thin films on solid substrates are investigated in the as-prepared state and after solvent-vapor annealing. Because Raman spectroscopy is less sensitive with decreasing film thickness, IR spectroscopy is shown to be a more feasible tool for phase detection. The surface-induced phase is mainly present in the as-prepared thin films, whereas the bulk phase is present after solvent-vapor annealing. This result suggests that the surface-induced phase is a metastable polymorph.
| Originalsprache | englisch |
|---|---|
| Seiten (von - bis) | 993 - 1000 |
| Fachzeitschrift | ChemPhysChem |
| Jahrgang | 19 |
| DOIs | |
| Publikationsstatus | Veröffentlicht - 2018 |
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ASJC Scopus subject areas
- !!Atomic and Molecular Physics, and Optics
- !!Physical and Theoretical Chemistry
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Substrate-Induced Phase of a Benzothiophene Derivative Detected by Mid-Infrared and Lattice Phonon Raman Spectroscopy. / Schrode, Benedikt; Jones, Andrew O.F.; Resel, Roland; Bedoya, Natalia; Schennach, Robert; Geerts, Yves Henri; Ruzié, Christian; Sferrazza, Michele; Brillante, Aldo; Salzillo, Tommaso; Venuti, Elisabetta.
in: ChemPhysChem, Jahrgang 19, 2018, S. 993 - 1000.Publikation: Beitrag in einer Fachzeitschrift › Artikel › Forschung › Begutachtung
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TY - JOUR
T1 - Substrate-Induced Phase of a Benzothiophene Derivative Detected by Mid-Infrared and Lattice Phonon Raman Spectroscopy
AU - Schrode, Benedikt
AU - Jones, Andrew O.F.
AU - Resel, Roland
AU - Bedoya, Natalia
AU - Schennach, Robert
AU - Geerts, Yves Henri
AU - Ruzié, Christian
AU - Sferrazza, Michele
AU - Brillante, Aldo
AU - Salzillo, Tommaso
AU - Venuti, Elisabetta
PY - 2018
Y1 - 2018
N2 - The presence of a substrate-induced polymorph of 2,7-dioctyloxy[1]benzothieno[3,2-b]benzothiophene is probed in microscopic crystals and in thin films. Two experimental techniques are used: lattice phonon Raman and IR spectroscopy. The bulk crystal and substrate-induced phase have an entirely different molecular packing, and therefore, their Raman spectra are characteristic fingerprints of the respective polymorphs. These spectra can be unambiguously assigned to the individual polymorphs. Drop-cast and spin-coated thin films on solid substrates are investigated in the as-prepared state and after solvent-vapor annealing. Because Raman spectroscopy is less sensitive with decreasing film thickness, IR spectroscopy is shown to be a more feasible tool for phase detection. The surface-induced phase is mainly present in the as-prepared thin films, whereas the bulk phase is present after solvent-vapor annealing. This result suggests that the surface-induced phase is a metastable polymorph.
AB - The presence of a substrate-induced polymorph of 2,7-dioctyloxy[1]benzothieno[3,2-b]benzothiophene is probed in microscopic crystals and in thin films. Two experimental techniques are used: lattice phonon Raman and IR spectroscopy. The bulk crystal and substrate-induced phase have an entirely different molecular packing, and therefore, their Raman spectra are characteristic fingerprints of the respective polymorphs. These spectra can be unambiguously assigned to the individual polymorphs. Drop-cast and spin-coated thin films on solid substrates are investigated in the as-prepared state and after solvent-vapor annealing. Because Raman spectroscopy is less sensitive with decreasing film thickness, IR spectroscopy is shown to be a more feasible tool for phase detection. The surface-induced phase is mainly present in the as-prepared thin films, whereas the bulk phase is present after solvent-vapor annealing. This result suggests that the surface-induced phase is a metastable polymorph.
KW - Crystal growth
KW - Polymorphism
KW - Raman spectroscopy
KW - Surface analysis
KW - Thin films
UR - http://www.scopus.com/inward/record.url?scp=85042591949&partnerID=8YFLogxK
U2 - 10.1002/cphc.201701378
DO - 10.1002/cphc.201701378
M3 - Article
VL - 19
SP - 993
EP - 1000
JO - ChemPhysChem
JF - ChemPhysChem
SN - 1439-4235
ER -