¹³C NMR Study of Molecular Dynamics in Twisted Nematic Phases

Abstract

¹³C NMR spectral patterns over the full temperature range of the twisted nematic phase of the binary mixture of MBBA (methoxybenzylidene butylaniline) and chiral MBMBA (methoxybenzylidene 2–methyl butylaniline) are evaluated in terms of the molecular motions averaging the chemical shift tensors of the ³C nuclei. The measurements allowed for a determination of the molecular self–diffusion constant along the pitch axis of the helicoidal structure.