Source:
TRANSITION METAL CHEMISTRY, Volume 33, Number 5, p.553-561 (2008)
Abstract:
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.
