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