In plane and out of plane anisotropy in Langmuir-Blodgett films of discogenic molecules

Autor:	J. Pérez, M. Vandevyver, M. Verber, H. Strzelecka, A. Barraud, C. Jallabert
Rok vydání:	1993
Předmět:	Materials science Tetrafluoroborate business.industry Mesogen General Chemistry Condensed Matter Physics Langmuir–Blodgett film chemistry.chemical_compound Crystallography Optics chemistry Liquid crystal Monolayer Perpendicular Molecule General Materials Science business Anisotropy
Zdroj:	Liquid Crystals. 14:1627-1634
ISSN:	1366-5855 0267-8292
DOI:	10.1080/02678299308027702
Popis:	Langmuir-Blodgett films of a discotic mesogenic pyrylium tetrafluoroborate salt (1) have been investigated from the point of view of their in-plane anisotropy, i.e. considering the average molecular orientation with respect to the dipping direction. The molecules are found to stand on edge with their flat polycyclic core more or less perpendicular to the dipping direction. Mixing 1 with N(C4H9)4 + TCNQ− in the spreading solvent leads to a different behaviour of the monolayer at the air-water interface, involving the formation of the Pyrylium-TCNQ salt. In contrast to the films of pure 1, these films do not exhibit any in-plane anisotropy after deposition on a solid substrate. The temperature dependance of the molecular anisotropy of both films has also been investigated. The results are presented and discussed in the framework of their mesomorphic properties together with the influence of the anion associated with Pyrylium.
Databáze:	OpenAIRE
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