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The effect of alkali metal chlorides and 1‐substituted 3‐carbamoylpyridinium bromides (2a–d) on the metachromatic behavior of methylene blue (1) induced by poly(potassium styrenesulfonate) (PSS) and poly(potassium vinyl sulfate) (PVS) was investigated spectrophotometrically. The size of hydrated ion and the hydrophobicity of substituent were significant factors for inorganic and organic salts, respectively. Effect of these salts on the metachromasy was characteristic of each polyanion used. A peculiar phenomenon that the metachromasy of the PSS‐1 system was enhanced on addition of small amounts of 1‐dodecyl‐3‐carbamoylpyridinium bromide (2d) was observed.
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Shirai et al. (1977) studied this question.
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