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А. V. Golovanov¹, A. S. Maslennikova², N. A. Churochkina¹, A. S. Sonin¹

Author affiliations
¹Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences
Vavilov’s st. 28, Moscow, 119991 Russia
E-mail: gav@ineos.ac.ru
²Lomonosov Moscow State Academy of Fine Chemical Technology
Vernadsky's avenue, 86, Moscow, 119571 Russia

Abstract
With the purpose of studying viscous and elastic properties of new lyotropic nematic mesophase, the formation of the nematic mesophase in benzopurpurin-4В (BP-4В) – water and BP-4В – electrolytes systems is investigated by the polarization optical method. It is shown, that 0,8 – 2,0 % in water and 0,5 – 2,0 % solutions BP-4В in electrolits NaCl and KCl (concentration 0,003 and 0,03 М) form solutions BP-4В of nematic mesophase to which the formation of the tactoid precedes. Eventually, the nematic turns to anisotropic gel phase. At concentration of BP-4В 2,5 mas. % in water and 2,0 mas. % in electrolytes anisotropic gel phase is formed.

Keywords: benzopurpurin, nematic, nematic mesophase, lyotropic mesophase, chromonic mesophase, anisotropic gel phase, polarization optical method.