J. Schacht et P. Zugenmaier, Shape and orientation of the chiral dipole in ferroelectric liquid crystals studied by solid-state C-13 NMR, FERROELECTR, 245(1-4), 2000, pp. 679-688
We report the results of one and two-dimensional solid-state nuclear magnet
ic resonance measurements in the ferroelectric liquid crystalline phases of
a single compound being carbon-13 labeled at the chiral dipole. The shape
and orientation of this dipole has been determined from homonuclear dipolar
couplings and the chemical shift anisotropy. These investigations open a w
ay for a direct calculation of the lateral dipole moment contributing to th
e spontaneous polarization. A fast non-biased intramolecular reorientation
is established within the ferroelectric liquid crystalline phase. The chira
l aliphatic chain is significantly tilted with respect to the director.