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Four low temperature solid states of long chain alkyl-and alkoxycyanobiphenyls(n= 5-8) have been obtained by special crystallization technique. The peculiarities of local molecular ordering and molecular dynamics in these phases are discussed on the basis of DTA-and kinetic data. Thermal behavior and molecular dynamic properties of liquid crystalline systems at low temperatures are of great interest. Lowering the temperature led to stabilization. solid state polymorphism is a particular feature of mesogenic compounds'. The variety of molecular organization in liquid crystalline mesophases of long chain alkyl-and alkoxycyanobiphenyls is closely connected with their solid phase structures.It has been shown by DTA-method that mesogenic alkylcyanobiphenyls:CSHIi-C6H4-C6H4-CN (5CB)

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