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The copper complexes of serine and threonine have been studied under a wide pH range. Results obtained by conductivity measurements, potentiometry, visible and EPR spectroscopy all indicate that hydroxyamino acids are coordinated in a tridentate fashion. Evidence is presented which shows that metal-alkoxy bonds are formed in basic solutions and that the deprotonated ligands then form anionic copper complexes.
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Sharrock et al. (1981) studied this question.
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