Abstract
For a binary liquid mixture in which the proton NMR spectrum consists of two chemically shifted lines, both longitudinal and transverse relaxation can be described by two self-relaxation rates and one cross-relaxation rate. The existence of cross-relaxation gives rise to a homonuclear (intermolecular) nuclear Overhauser enhancement and also to an observable dependence of transverse relaxation rates upon pulse spacing in Carr-Purcell spin-echo experiments. Analysis of these phenomena, together with isotopic dilution experiments, permits determination of the relative efficiencies of dipole-dipole relaxation via different intermolecular pathways. Experimental results for a mixture of benzene with 2,5-dibromothiophene indicate preferential self-association of benzene molecules in the liquid mixture.
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