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The family of chelators under study is pharmaceutically relevant in the treatment of iron\u2010overloaded patients and it is foreseen to be of use in occupational health situations associated with accumulation of nickel and cobalt such as nasal\/pulmonary and skin hazards and allergies. Ligand dissociation constants and stability constants for the cobalt(II) and nickel(II) complexes have been determined by potentiometric methods allowing the establishment of the corresponding speciation plots as a function of pH. The values of the stability constants are consistent with the Irving\u2013Williams series and indicate the formation of stable ML<jats:sub>2<\/jats:sub> complexes which were isolated and characterized. Following the trend observed for 3\u2010hydroxy\u20104\u2010pyridinone ligands the solids were obtained as hydrates whose composition was characterized as [ML<jats:sub>2<\/jats:sub>(H<jats:sub>2<\/jats:sub>O)<jats:sub>2<\/jats:sub>]<jats:bold>\u00b7<\/jats:bold>xH<jats:sub>2<\/jats:sub>O complexes. DFT calculations allowed geometry optimization and provided information about bond lengths and angles.<\/jats:p>","DOI":"10.1002\/ejic.201000849","type":"journal-article","created":{"date-parts":[[2010,11,25]],"date-time":"2010-11-25T04:56:23Z","timestamp":1290660983000},"page":"131-140","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Nickel(II) and Cobalt(II) 3\u2010Hydroxy\u20104\u2010pyridinone Complexes: Synthesis, Characterization and Speciation Studies in Aqueous Solution"],"prefix":"10.1002","volume":"2011","author":[{"given":"Carla","family":"Queiros","sequence":"first","affiliation":[]},{"given":"M. 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