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Effects of interactions with the surface on the orientation of the mesogenic monoazacrown-substituted phthalocyanine films |
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| Authors: | Tamara Basova Florian Latteyer Ayse Gül Gürek Vefa Ahsen Heiko Peisert |
| Affiliation: | a Nikolaev Institute of Inorganic Chemistry, Novosibirsk, Russia b Institute of Physical and Theoretical Chemistry, University of Tübingen, Germany c Gebze Institute of Technology, Department of Chemistry, P.O. Box: 141, 41400, Gebze, Kocaeli, Turkey d Faculty of Arts, Computing, Engineering and Sciences, Sheffield Hallam University, Furnival Building, 153 Arundel Street, Sheffield S1 2NU, United Kingdom e TUBITAK-Marmara Research Center, Materials Institute, P.O. Box: 21, 41470, Gebze, Kocaeli, Turkey |
| Abstract: | In this paper, the effect of interaction with the substrate surface on the orientation of films' molecules of substituted liquid crystalline phthalocyanines M(II)Pc (M = Cu, Ni, Zn) having monoazacrown ether moieties on the periphery containing long alkyloxyphenyl N-pivotal groups is studied. The phthalocyanine derivatives demonstrate thermotropic mesophase behaviour and show Colh mesophases over a wide temperature range. The preferential orientation of the phthalocyanine films deposited on glass, silicon and NaCl substrates as well as between two of those substrates is studied by polarized Raman spectroscopy at different temperatures. These phthalocyanines form homeotropically aligned films on the surface of NaCl substrate, whereas planar alignment with a random distribution of the column directors occurs on the glass slides. |
| Keywords: | Phthalocyanine Liquid crystal Thin film Azacrown ether Raman spectroscopy |
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