E. Voss et al., PRESSURE-DEPENDENCE OF OPTICAL-ACTIVITY I N THE ISOTROPIC-PHASE OF A CHIRAL LIQUID-CRYSTAL, Berichte der Bunsengesellschaft fur Physikalische Chemie, 97(10), 1993, pp. 1205-1208
Citations number
13
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
Optical activity measurements in the isotropic liquid phase of cholest
eryl oleyl carbonate just above the liquid-crystal transition pressure
were performed for various temperatures up to 200 MPa. The observed o
ptical activity exceeds the molecular activity and can be explained as
a pretransitional phenomenon. The maximum value, which the optical ac
tivity reaches as the transition to the liquid-crystal phase is approa
ched, first decreases then increases when clearing temperature and pre
ssure are raised. A theoretical relationship between the pretransition
al optical activity and two structural modes is used to interpret this
unusual behaviour.