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New pyridinium type thermotropic ionic liquid crystal materials bearing a 1,3-oxathiane ring in their central core: N-substituted 4-(5-alkyl-1,3-oxathian-2-yl)pyridinium bromides (8) and corresponding 1,3-dioxane analogs (10) were synthesized. And the mesomorphic behaviors of these two systems are compared. The principal feature of these compounds is to exhibit a smectic A phase over a very wide temperature range including room temperature [for example 8-4: G -7 SmA 166 I; 10-4: G -24 SmA 152 I (°C)].

New pyridinium type thermotropic ionic liquid crystal materials having a 1,3-oxathiane ring in the central core,N-ethyl-4-(5-alkyl-1,3-oxathian-2-yl)pyridinium bromides 8, were synthesized. These compounds exhibited a smectic A phase over a very wide range including room temperature (for example 8c: G –30 SA 21 I).

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