Substrate-Induced Phase of a Benzothiophene Derivative Detected by Mid-Infrared and Lattice Phonon Raman Spectroscopy

Benedikt Schrode, Andrew O.F. Jones, Roland Resel, Natalia Bedoya, Robert Schennach, Yves Henri Geerts, Christian Ruzié, Michele Sferrazza, Aldo Brillante, Tommaso Salzillo, Elisabetta Venuti

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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.

Originalspracheenglisch
Seiten (von - bis)993 - 1000
FachzeitschriftChemPhysChem
Jahrgang19
DOIs
PublikationsstatusVeröffentlicht - 2018

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Polymorphism
Raman spectroscopy
Infrared radiation
Derivatives
Substrates
thin films
Thin films
vapors
Infrared spectroscopy
annealing
Vapors
Annealing
spectroscopy
Crystals
crystals
casts
film thickness
Raman spectra
Film thickness
Raman scattering

Schlagwörter

    ASJC Scopus subject areas

    • !!Atomic and Molecular Physics, and Optics
    • !!Physical and Theoretical Chemistry

    Dies zitieren

    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 FachzeitschriftArtikelForschungBegutachtung

    Schrode, B, Jones, AOF, Resel, R, Bedoya, N, Schennach, R, Geerts, YH, Ruzié, C, Sferrazza, M, Brillante, A, Salzillo, T & Venuti, E 2018, 'Substrate-Induced Phase of a Benzothiophene Derivative Detected by Mid-Infrared and Lattice Phonon Raman Spectroscopy' ChemPhysChem, Jg. 19, S. 993 - 1000. https://doi.org/10.1002/cphc.201701378
    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. / Substrate-Induced Phase of a Benzothiophene Derivative Detected by Mid-Infrared and Lattice Phonon Raman Spectroscopy. in: ChemPhysChem. 2018 ; Jahrgang 19. S. 993 - 1000.
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    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.",
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    author = "Benedikt Schrode and Jones, {Andrew O.F.} and Roland Resel and Natalia Bedoya and Robert Schennach and Geerts, {Yves Henri} and Christian Ruzi{\'e} and Michele Sferrazza and Aldo Brillante and Tommaso Salzillo and Elisabetta Venuti",
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    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

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    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

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