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Abstract
The liquid crystal polymorphism of n-pentyl 4-[4'-n-dodecyloxybenzylideneamino] cinnamate, AABC (12.5), has been reconsidered. The revised variant of smectic polymorphism GICA has been found. All earlier investigations on miscibility with AABC (12.5) were critically examined. Incorporating the latest results, a summary of the spread of the occurrence of the phase type I is given. Smectic I phases are always the high temperature modifications in systems having ordered and tilted layer structures in a general temperature sequence HGFI.