Ruthenium complexes of 3-hydroxy-4-pyranones and of 3-hydroxy-4-pyridinones |
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| Authors: | John Burgess Simon A. Parsons Kuldip Singh Emma Waltham Pilar López Francisco Sánchez Maria Rangel Walkiria Schlindwein |
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| Affiliation: | (1) Department of Chemistry, University of Leicester, Leicester, LE1 7RH, UK;(2) Present address: Department of Water Sciences, Cranfield University, Cranfield, MK43 0AL, UK;(3) Departamento de Quimica Fisica, Universidad de Sevilla, C/Prof. Garcia Gonzalez s/n, Sevilla, 41012, Spain;(4) REQUIMTE, Instituto de Ciências Biomédicas de Abel Salazar, Universidade do Porto, Porto, 4099, Portugal;(5) School of Pharmacy, De Montfort University, Leicester, LE1 9BH, UK |
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| 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)3Cl 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 · 6H2O. 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. |
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