0 Burgess, John Parsons, Simon A. Singh, Kuldip Waltham, Emma Lopez, Pilar Sanchez, Francisco Rangel, Maria Schlindwein, Walkiria 2008 Ruthenium complexes of 3-hydroxy-4-pyranones and of 3-hydroxy-4-pyridinones TRANSITION METAL CHEMISTRY 33 553-561 AUG Reactions of hydrated ruthenium chloride with 2-methyl-3-hydroxy-4-pyranone, ethylmaltol (etmaltH) and with 1,2-dimethyl-3-hydroxy-4-pyridinone (dmppH) are described. The former results in the formation of Ru(etmalt)(3), but the course of the latter depends on conditions, producing the earlier-characterised Ru(dmmp)(3)Cl in ethanol-water solution, Ru(dmmp)(3) in aqueous solution under mild conditions, and Ru(dmpp)(2)(H2O)(2) after extended refluxing. EXAFS studies established ruthenium-oxygen distances in Ru(etmalt)(3) and in Ru(dmmp)(3) center dot 6H(2)O. Solubilities of Ru(dmmp)(3) in methanol-water mixtures reveal greater solubility in methanol than in water, and indications of a modest solubility maximum, and thus synergic solvation, in methanol-rich mixtures.