Order and Molecular Dynamics of Phenyl Benzoate Dissolved into the Ferroelectric Liquid Crystal FLC032 in Sa and Sc* phases.

Abstract

For the probe molecule Phenyl Benzoate[PB] having a 13C-enriched carbonyl, 1H dipole-split 13C spectra are observed in Sa and Sc* phases, together with 13C observations, including T1, both for PB and FLC032 under 1H decoupling. Split 7 lines observed in Sa indicate rapid 180 flip motions of the two phenyl rings and different contributions to the line spacings from 1H's in the two rings. Temperature dependences of their chemical shifts show the alignment of PB with the core of FLC032 in Sa. In Sc*, two sets of split lines with 7 and 9 components are observed. With decreasing temperature, the former 7 are down-field shifted and the latter 9 up-shifted. The former ones come from PB subjected to the tilting in Sc*, while the latter are due to PB excluded into the chain region of FLC032.