Abstract
The electromagnetic scattering method is the best suited to evaluate the mass, size and shape of the solute molecules in solution without applying the external stimuli, provided that the scattered intensity is measured in an absolute scale. Here the degree of aggregation was evaluated for 4 acid dyestuffs (Orange II, Rocceline, Azorubin and New Coccine) by measuring the absolute intensity of small-angle X-ray scattered from their aqueous solutions. The degree of aggregation was found to increase with increasing the salt (KCI) concentration. The radius of gyration determined from small-angle X-ray scattering profile was compared with that calculated from the molecular model of dimeric dyestuffs in order to estimate the intermolecular distance between two adjacent dyestuffs in the aggregates.
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