Studies of polymorphism of right handed (S)-4-(2-methylbutyl)-4 '-cyanobiphenyl

Basing on the results of polarizing microscopy, differential scanning calor imetry (DSC) and infrared spectroscopy (in the range 70 -700 cm(-1)) in the temperature range from 100 K to 320 K the phase diagram of right handed (S ) 4-(2-methylbutyl)-4'-cyanobiphenyl was established. On cooling an isotrop ic phase transforms at 246 Ii into a cholesteric phase which can be easily supercooled to a glass at ca, 210 Ii, On heating this sequence of transitio ns reverses. Further heating of the sample leads to crystallization of supe rcooled isotropic phase at about 250 ii. The crystal phase melts at 276 Ii. It was clarified that process of nucleation starts on cooling below 240 Ii , The shape of the far infrared bands (lattice vibration range) suggests th at the crystal phase is highly disordered.