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Ruthenium(III)-edta reacts with the 2-mercaptonicotinic ligand in aqueous solution yielding a red product (λ max = 530 nm) coordinated at the S atom. This species undergoes deprotonation with an apparent pK a = 3.80, generating a blue complex in which the ligand is (S,N)-bidentate. In the presence of two times excess of ruthenium(III)-edta a binuclear species is formed,...
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