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The protonation constants of 5,10,15,20-tetrakis(4-trimethyl-ammonio-phenyl)-porphine tetratosylate (TTMAPP) were determined in water–methanol mixed solvents, using a combination of spectrophotometric and potentiometric methods at 25 °C in 0.1 mol·dm−3 sodium perchlorate. Two protonation constants, K1 and K2, were characterized and analyzed in various media in terms of the normalized polarity parameter...
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