DIELECTRIC-RELAXATION OF N-CYANO SUBSTITUTED MORPHOLINE, PIPERIDINE AND PYRROLIDINE

The dynamic dielectric properties of the title substances are measured at 20-degrees-C at frequencies up to 72 GHz in the pure liquid state and in mixtures (x = 0.4 - 1) with benzene and tetrachloromethane. Rotational tumbling motion of single (non-associated) molecules is likely to be the main relaxation process. Peculiarities are found with two out of the six systems, namely mixtures of cyanopiperidine and cyanopyrrolidine with tetrachloromethane. These are discussed as possibly due to a concentration dependent conformational equilibrium.