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 relaxat ion rate and the pair correlation function is shown when association b etween the molecules is effective. It is demonstrated that the quantit y (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 intermol ecular relaxation rate (of protons), namely it increases as c(1) decre ases if association exists. (1/T-1)(m) is the deuteron relaxation rate of the monomeric molecule. Experimental H-2-relaxation rates of DOC2H 5 and C2D5OH in the mixture with CCl4 are reported, and dilution is ex tended 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.