Abstract
Both pulse and C.W. proton n.m.r. have been used for further study of the mobility of the hydrocarbon chains and headgroups in some smectic liquid crystalline phases. It is shown that dipolar broadening is responsible for the observed proton linewidths in these systems, in the frequency range 10–40 MHz. In lecithins in the liquid crystalline phase, the −N +NMe 3 group is relatively mobile.
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