Liquid-crystalline properties of 4-alkyl-, 4-alkyloxy and 4-halogene-4'-hydroxyazobenzene alkyloates

• Autorzy: Trzaska J. , Galewski Z.
• Języki publikacji: EN

Abstrakty

EN

Twenty one esters, 4-alkyl-, 4-alkyloxy-, 4-nitro- and 4-halogene-4'-hydroxyazobenzne alkyloates have been synthesised. Basing on the DSC calorimetry and polarizing microscopy liquid- crystalline polymorphism was investigated. Five types of mesophases were identified: nematic, smectics A, C, F and unknown X (probably G).

Słowa kluczowe

EN

liquid crystals; smectics; azo; DSC calorimetry; polarizing microscopy

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2009
• Tom: Vol. 17, No. 2
• Strony: 129--139
• Opis fizyczny: Bibliogr. 21 poz., wykr., il.

Twórcy

autor

Trzaska J.

autor

Galewski Z.

• Faculty of Chemistry, University of Wrocław, 14 Joliot-Curie Str., 50-383 Wrocław, Poland

Bibliografia

• [1] A. Bogojawlensky and N. Winogradow, Z. Phys. Chem. 64, 229, 1908.
• [2] R. Steinsträsser and L. Pohl: Niedrigschmelzende p-Alkyl-p'-alkoxy und p-Alkyl-p'-acyloxy-azobenzole. Zeit. Naturforsch 26b, 577-580, 1971. (in German)
• [3] W. H. de Jeu and J. Van der Veen: On the relation between molecular structure and liquid crystalline behaviour. Philips Res. Rep. 27, 172-185, 1972.
• [4] K. Ichimura: Photoalignment of liquid-crystal systems. Chem. Rev. 100, 1847, 2000.
• [5] V. Shibaev, A. Bobrovsky, and N. Boiko: Photoactive liquid crystalline polymer systems with light-controllable structure and optical properties. Prog. Polym. Sci. 28, 729-836, 2003.
• [6] R. Dąbrowski and K. Kenig: Liquid-crystalline and spectral properties of position isomers of 4-cyano-4'-alkyloazoxy-benzenes. Biul. Pol. Acad. Sci. 34, 183, 1986.
• [7] R. Dąbrowski, G. Adamska, Z. Stolarzowa, A. Konarzewski, and W. Wacławek: Mesomorphic properties of the homologous series of 4-n-Propyl-4'-n-alkylazobenzenes and 4-n-Propyl-4'-n-alkyloazoxybenzenes. Pol. J. Chem. 54, 1233, 1980.
• [8] R. Dąbrowski, K. Kenig, Z. Raszewski, J. Kędzierski, and J. Sadowska: Synthesis and some physical properties of unsymmetrical 4,4'-dialkylazoxybenzenes. Mol. Cryst. Liq. Cryst. 61, 61-78, 1980.
• [9] J. Zienkiewicz and Z. Galewski: Smectic polimorphism of 4-butyl-4'-alkyloxyazobenzenes and 4-pentyl-4'-alkyloxyazobenzenes. Liq. Cryst. 23, 9-16, 1997.
• [10] J. Zienkiewicz and Z. Galewski: Smectic polymorphism of 4-hexyl-4'-alkyloxyazobenzenes and 4-heptyl-4'-alkyloxyazobenzenes. Proc. SPIE 3319, 45-54, 1998.
• [11] J. Zienkiewicz and Z. Galewski: Liquid crystalline properties of 4-methyl-, 4-ethyl- and 4-propyl-4'-alkyloxyazobenzenes. Pol. J. Chem. 76, 359-366, 2002.
• [12] Z. Galewski, A. Hofmańska, and K. Zielińska: Liquid crystalline properties of azobenzenes: I: 4-methyloxy-4'-alkyloxyazobenzenes, 4-ethyloxy-4'-alkyloxyazobenzenes, propyloxy-4'-alkyloxyazobenzenes and 4-butyloxy-4'-alkyloxyazobenzenes. Pol. J. Chem. 73, 1357-1371, 1999.
• [13] Z. Galewski: Liquid crystalline properties of azobenzenes: II. 4-pentyloxy-4'-alkyloxyazobenzenes, 4-hexyloxy-4'-alkyloxyazobenzenes and 4-heptyloxy-4'-alkyloxyazobenzenes. Pol. J. Chem. 73, 1503-1511, 1999.
• [14] Z. Galewski: Ciekłokrystaliczny polimorfizm 4-oktyloksy, 4-nonyloksy-, 4-decyloksy, 4'-undecyloksy i 4-dodecyloksy -4'-alkiloksyazobenzenów. Biuletyn Instytutu Chemii Fizycznej i Teoretycznej Politechniki Wrocławskiej 7, 53-62, 1999. (in Polish)
• [15] Z. Galewski: Liquid crystalline properties of 4-chloro-4'-alkyloxyazobenzenes. Mol. Cryst. Liq. Cryst. 265, 77-87, 1995.
• [16] Z. Galewski: Liquid crystalline properties of 4-bromo-4'-alkyloxyazobenzenes. Proc. SPIE 2372, 227-234, 1995.
• [17] M. S. Ho, B. M. Fung, and J. P. Bayle: Nitrophenyl liquid crystals with intramolecular hydrogen-bonding in the mesogenic core. Mol. Cryst. Liq. Cryst. 225, 383-389, 1993.
• [18] J. W. Goodby: A compound exhibiting a crystal b to hexatic b phase change. Mol. Cryst. Liq. Cryst. 72, 95, 1981.
• [19] C. L. Hillemann, G. R. Van Hecke, S. R. Peak, J. B. Winther, M. A. Rudat, D. A. Kalman, and M. L. White: Physical studies of homologous trans-4-Ethoxy-4'-n-alkanoyloxyazobenzenes. Calorimetry. J. Phys. Chem. 79, 15, 1975.
• [20] G. W. Gray and J. W. Goodby: Smectic Liquid Crystals. Textures and Structures, Leonard Hill, Glasgow and London, 1984.
• [21] Demus and L. Richter, Textures of Liquid Crystals, VEB Verlag fur Grundstoffindustrie, Leipzig, 1980.