Deuterium spin lattice relaxation studies of chloroform‐d₁ dissolved in mixtures of two thermotropic liquid crystals of opposite diamagnetic anisotropies

The spectral density functions J₁(ω₀) and J₂(2ω₀) have been determined for CDCl₃ dissolved in mixtures of N‐(4‐ethoxybenzylidene)‐4′‐n‐butylaniline (EBBA) and Merck’s licristal ZLI 1167 of various compositions. The measurements have been performed by use of the Jeener–Broekaert pulse sequence at 9.2 and 46.0 MHz. The nematic director is parallel to the direction of the magnetic field at high content of EBBA in the mixture and perpendicular at low content. The molecular dynamic has been studied at the transition point between these two directions. It has been shown that contributions exclusively from molecular rotational diffusion motions and small angle director fluctuations cannot sufficiently account for all the experimental observations.