Tracer caffeine diffusion in aqueous solutions at 298 K. The effect of caffeine self-association

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Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, ISSN: 0300-9599, Vol: 85, Issue: 2, Page: 415-419

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William E. Price
Royal Society of Chemistry (RSC); The Royal Society of Chemistry
Chemistry; k; caffeine; effect; self; tracer; diffusion; association; aqueous; solutions; 298; CMMB; Life Sciences; Physical Sciences and Mathematics; Social and Behavioral Sciences
article description
Tracer diffusion coefficients for caffeine in aqueous solutions are reported for the complete caffeine solubility range (0-0.1 mol dm) at 298 K. The results show a strong concentration dependence and are interpreted in terms of caffeine self-association. On the basis of a simple equilibrium model, estimates for the diffusion coefficients of the caffeine dimer and trimer are obtained.