Nuclear spin—lattice relaxation and molecular motions in the thermotropic mesophases of p-alkoxybenzylidene—p-n-alkylanilines

Experimental results of an investigation of the proton spin—lattice relaxation in a well-known homologous series exhibiting smectic polymorphism, are presented. Explanations for striking features of T₁ and T_1D dependences on temperature, frequency and molecular orientation in terms of molecular motions are proposed.