Abstract
A spectrofluorimetric method to study the interactions of naproxen with 1-vinyl-2-pyrrolidone and β-cyclodextrin in aqueous solution has been proposed. As complexation causes appreciable spectral changes, this method enables the determination of the stability constants. Complexation with β-cyclodextrin results in an enhancement of the fluorescence of naproxen whereas 1-vinyl-2-pyrrolidone involves a quenching of fluorescence. It has been supposed 1:1 complex formation. Specifically, formation constants, enthalpy and entropy values have been obtained for the aforementioned complexes at different temperatures and pH values; their associated errors are given.
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