Magnetic relaxation and quadrupole splitting for liquid crystalline solutions of poly-γ-benzyl-L-glutamate in CDCl3 and CD2Cl2

Abstract

The spin‐lattice relaxation time (T₁) of protons and deuterons and the deuterium quadrupole splitting in liquid crystalline solutions of poly‐γ‐benzyl‐L‐glutamate (PBLG) in CDCl₃ and CD₂Cl₂ are reported. The proton T₁ of PBLG has a strong frequency dependence; as a function of temperature, it shows a minimum at high frequencies. The data cannot be conveniently handled by a rigid ellipsoid model, but calculations based upon a log‐Gaussian distribution in the correlation time show reasonable agreement with experimental data. The deuterium quadrupole splittings of CDCl₃ and CD₂Cl₂ are linear functions of the reciprocal temperature, with slopes independent of concentration. T₁ for deuterium in the solvents does not show any anomaly in the concentration range in which the phase transition occurs.