SHARPENING OF THE ETOH-ETOH PAIR CORRELATION-FUNCTION IN THE ETHANOL CCL4 MIXTURE AS DETECTED BY INTRAMOLECULAR DEUTERON MAGNETIC-RELAXATION

The interrelation between the intramolecular deuteron magnetic relaxation rate and the pair correlation function is shown when association between the molecules is effective. It is demonstrated that the quantity (1/T-1 - (1/T-1)(m))/c(1) = A' has essentially the same property as the quantity A = (1/T-1)(inter) . D/c(1), which refers to the intermolecular relaxation rate (of protons), namely it increases as c(1) decreases if association exists. (1/T-1)(m) is the deuteron relaxation rate of the monomeric molecule. Experimental H-2-relaxation rates of DOC2H5 and C2D5OH in the mixture with CCl4 are reported, and dilution is extended to x(1) approximate to 0.002 whereby the theoretical prediction is verified. The results are compared with the corresponding Kirkwood-Buff integral and with the analog of the A-parameter as derived from chemical shift measurements.