Synthesis and characterization of liquid crystalline unsymmetrically substituted phthalocyanines |
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Authors: | Fatma Yuksel Devrim Atilla Vefa Ahsen |
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Affiliation: | 1. Gebze Institute of Technology, Department of Chemistry, P.O. Box 141, Gebze 41400, Turkey;2. TUBITAK-Marmara Research Center, Materials Institute, P.O. Box 21, Gebze 41470, Turkey |
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Abstract: | The synthesis of unsymmetrically substituted phthalocyanines bearing two p-tolyl-sulfonyl (tosyl)amido and six alkylthio moieties was achieved by cyclotetramerisation of two different phthalonitrile derivatives, namely 1,2-di(alkylthio)-4,5-dicyanobenzene and 4,5-dicyano-N,N′-ditosyl-o-phenylenediamine in the presence of an anhydrous metal salt and strong base. The new compounds were characterized by elemental analyses, UV/Vis, IR, NMR and mass spectra. The mesogenic properties of these new materials were studied by differential scanning calorimetry (DSC) and polarizing optical microscopy. The mesogenic properties of these compounds were compared to that of their symmetric analogous, octaalkythia substituted phthalocyanine derivatives. |
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Keywords: | Phthalocyanine Asymmetric phthalocyanine Liquid crystal Metallomesogen |
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