Columnar liquid crystalline tris-(ether)triazines with pendant 1,3,4-thiadiazole groups: synthesis,mesomorphic, luminescence,solvatofluorochromic and electrochemical properties |
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Authors: | Felipe A. Olate José A. Ulloa Susana A. Sánchez Joaquín Barberá |
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Affiliation: | 1. Departamento de Química Orgánica, Universidad de Concepción, Concepción, Chile;2. Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile;3. Departamento de Química Orgánica, Facultad de Ciencias-Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-C.S.I.C., Zaragoza, Spain |
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Abstract: | Novel columnar liquid crystals whose molecular structures consist of a C3 star-shaped 1,3,5-triazine unit as a central core, and three pendant 2-phenyl-5-(di-, and/or tri-n-alkoxyphenyl)-1,3,4-thiadiazole arms, containing ether connecting groups, variable number and positions of linear alkoxy chains were synthesised and their mesomorphic properties were studied by differential scanning calorimetry, polarised optical microscopy and X-ray diffraction. The mesomorphic properties were found to be dependent on the length, position and number of the peripheral alkoxy chains. Most compounds form enantiotropic hexagonal columnar phases. These compounds also show photoluminescent properties in the visible region with good quantum yields. Photophysical studies were realised in solution and in solid state. Also, solvatofluorochromism and cyclic voltammetry studies were performed. |
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Keywords: | Star-shaped columnar liquid crystals triazine 1 3 4-thiadiazole fluorescence |
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