MOLECULAR-DYNAMICS STUDIES IN ISOTROPIC-PHASE OF N-TPEBS BY DIELECTRIC-RELAXATION METHOD

The result of dielectric relaxation measurements (1 kHz divided by 1 G Hz) for series of mesogenic molecules CnH2n+1-phi-phi-CH2CH2-phi-NCS, n-TPEB, (n = 7 divided by 10) in the isotropic phase, have been presen ted. Two Debye-type bands have been interpreted as a dielectric absorp tion due to the rotation around the long and short molecular axis. An optimization of the geometry of non-rigid TPEB molecules have been mad e using a quantum mechanics semi-empirical method PM3.