Wide temperature range and high photochemical stability smectic liquid crystal compositions with a monolayer smectic a phase (sma1), method of obtaining thereof and devices utilizing thereof

An ionic compound expressed by the general formulae 22-26,

• wherein
• substituents R10, R11, R13 and R15 in cationic part of the molecule are meaning independently a hydrogen atom or an alkyl group or an alkyl cyclohexyl group or a phenyl group or an alkyl phenyl group and they are the same or different and contain 1 to 25 carbon atoms;
• the substituents R12 and R14 are an alkyl group containing independently from 1 to 25 carbon atoms, preferably from 12 to 18 carbon atoms;
• in the formula 23 symbols A and B denote a part of the ring containing from two to five methylene group leading to specially preferable compounds with the system of rings expressed by formulae 24 (A=5, B=3) or 25 (A=4, B=2), wherein R14 is preferably an alkyl group containing from 2 to 18 carbon atoms;
• the anion Y− denotes an organic or an inorganic anions preferably:
• Clθ— (a), Brθ— (b), ClO4θ— (c), CF3SO3θ— (d), R5-SO3θ— (e), SCNθ (f)
• wherein substituents R5, R6, R7 and R8 denote a hydrogen or an normal alkyl group or an iso-alkyl group or a sec-alkyl group each containing independently from 1 to 20 carbon atoms, R9 is a branched alkyl group preferably the tert-butyl group used as an ionic dopant to increase conductivity in smectic A compositions.

An ionic compound expressed by the general formulae 27 and 28,

• wherein
• symbol A is a cyclohexane ring or a benzene ring,
• substituents R16 are independently a hydrogen atom or an alkyl group the same or different containing each from 1 to 16 carbon atoms;
• anion Y− is an organic anion or an inorganic anion preferably:
• Clθ— (a), Brθ— (b), ClO4θ— (c), CF3SO3θ— (d), R5-SO3θ— (e), SCNθ (f)
• used as an ionic dopant to increase conductivity in smectic A compositions.