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Abstract
AbstractThe effect of polyanions on the formation of mixed dimers of methylene blue (1) and trypaflavine (2), methylene blue (1) and phenosafranine (3), and methylene blue (1) and pyronine G (4) was investigated spectrophotometrically. The following polyanions were used: poly(potassium styrenesulfonate) (PSS), poly(potassium vinyl sulfate) (PVS), and poly(sodium acrylate) (PAA). On addition of polyanions, the formation of mixed dimers was enhanced largely. Thermodynamic parameters inferred that the enhancement of the formation of mixed dimers in the presence of polyanions resulted from an entropic factor.
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