Benzene-lecithin interaction interaction in lecithin-benzene solutions. Part L Magnetic deuterium relaxation studies.

ABSTRACT

2D relaxation times of deuterobenzene in lecithin-benzene solutions were measured at 4.4 and 11 MHz with respect to concentration and temperature. At the temperature of the transition from the micellar solution to the gel state the relaxation behaviour was drastically changed. Analysis of the experimental results performed on the basis of familiar relaxation theory shows that there are sites at which benzene interacts with lecithin in the micellar solution as well as in the gel state. The interaction enthalpies and entropies determined for the two benzene species existing in the gel state are--1.3 kcal/mol,--20 eu and--3.1 kcal/mol, --24 eu.