Results of dynamic light scattering experiments with aqueous solutions of benzene[9]3-arborol (molar mass, M = 1.486 . 10(3) g mol-1; spherical dimension (radius) estimated on the basis of molecular models, a almost-equal-to 1 nm) at 25-degrees-C are reported. They indicate that benzene[9]3-arborol molecules in aqueous solution form aggregates which have dynamic properties similar to that of single polymer chains in good solvents in the cross over region (q r(h)) almost-equal-to 1 (q, absolute value of the scattering vector, (r(h), hydrodynamic radius of the scattering particles). A double logarithmic plot of maximum value of the distribution of relaxation rates of the autocorrelation function of the scattered light intensity GAMMA(max) versus the q (0.68 less-than-or-equal-to (q/q+) less-than-or-equal-to 2.40; q+ = 10(5) cm-1) gives a straight line with a slope D* = (2.46 +/- 0.05) independent of concentration (GAMMA(max) approximately (q/q+)D*). The size of the scattering particles appear not to change with concentration in the concentration range studied (3.5 . 10(-3)c+ less-than-or-equal-to c less-than-or-equal-to 13.37 . 10(-3)c+; c+ = 1 mol dm-3). Values of D* (2 less-than-or-equal-to D* less-than-or-equal-to 3) indicate that the experiments are carried out in the non-universal crossover regime (q r(h)) almost-equal-to 1. From the ratio (GAMMA(max)/q2)o refering to the limit q double-line arrow pointing right 0 a hydrodynamic radius of r(h) of the order r(h) = O(100 nm) is calculated. This is in agreement with the conclusion drawn from the q-dependence of GAMMA(max) (i.e. (q r(h)) almost-equal-to 1). - The partial molar volume of benzene[9]3-arborol in aqueous solution increases with concentration only in very dilute solutions. It is practically constant in the concentration range in which the dynamic light scattering experiments are carried out. The surface tension of these solutions at the air/solution interface decreases only slightly with concentration reflecting the hydrophilic character of the surface of the aggregates.
