Related Experiment Video
Updated: May 9, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
Enantiotopic discrimination and director organization in the twist-bend nematic phase
Cristina Greco1, Geoffrey R Luckhurst, Alberta Ferrarini
1Dipartimento di Scienze Chimiche, Università di Padova, Padova, Italy.
Abstract:
Extending a molecular field model for the orientational order in the nematic phase, we calculate the (2)H-NMR splittings for the achiral solute 8CB-d2 in the twist-bend nematic phase formed by the achiral liquid crystal dimer CB7CB. We give an explanation for the enantiotopic discrimination observed in the spectra and comparison with experimental data allows us to provide quantitative estimates of the order parameters (pitch and conical angle) that characterize the director modulation of the twist-bend nematic phase.
Related Concept Videos
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
Properties of Enantiomers and Optical Activity
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
Prochirality
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

