Acid-base equilibria of various oxidation states of aqua-ruthenium complexes with 1,10-phenanthroline-5,6-dione in aqueous media

Dalton Transactions : an International Journal of Inorganic Chemistry
Tetsuaki FujiharaKoji Tanaka

Abstract

Syntheses and pH dependent electrochemical properties of aqua-ruthenium(II) complexes, [Ru(trpy)(PDA-N,N')(OH2)](ClO4)2 ([1](ClO4)2) and [Ru(trpy)(PD-N,N')(OH2)](ClO4)2 ([2](ClO4)2) (trpy = 2,2':6',2''-terpyridine, PDA = 6-acetonyl-6-hydroxy-1,10-phenanthroline-5-one, PD = 1,10-phenanthroline-5,6-dione) are presented. Treatment of [Ru(trpy)(PD-N,N')Cl](PF6) with AgClO4 in a mixed solvent of acetone and H2O selectively produced the acetonyl-PD complex [1](ClO4)2, and the similar treatment in a mixed solvent of 2-methoxyethanol and H2O gave the PD complex [2](ClO4)2. The molecular structures of both complexes were determined by X-ray structural analysis. The proton dissociation constants of various oxidations state of [1]2+ and [2]2+ were evaluated by simulation of E(1/2) values of those redox potentials depending on pH. The simulation revealed that the acetonyl-PD complex [1]2+ underwent successive Ru(II)/Ru(III) and Ru(III)/Ru(IV) redox couples though the two redox reactions were not separated in the cyclic voltammograms. The redox behavior of [2]2+ in H2O is reasonably explained by not only the similar successive metal-centered redox reactions but also simultaneous two-electron quinone/catechol redox couple of the PD ligand in...Continue Reading

References

Feb 28, 2001·Inorganic Chemistry·C M HartshornT J Meyer
Jul 3, 1996·Inorganic Chemistry·Angelos DovletoglouThomas J. Meyer
Oct 24, 2001·Inorganic Chemistry·Vincent J. CatalanoMichael G. Hill
Oct 24, 2001·Inorganic Chemistry·Estelle L. LebeauThomas J. Meyer
Oct 24, 2001·Inorganic Chemistry·Estelle L. Lebeau, Thomas J. Meyer
May 29, 2003·Journal of the American Chemical Society·Katsuaki KobayashiKoji Tanaka
Feb 1, 1986·Journal of the American Chemical Society·M E Marmion, K J Takeuchi

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Citations

Jan 1, 2007·Acta Crystallographica. Section E, Structure Reports Online·Alireza AbbasiSara Tarighi
Apr 1, 2016·ACS Applied Materials & Interfaces·Toan V PhoJohn R Reynolds
Jul 13, 2006·Dalton Transactions : an International Journal of Inorganic Chemistry·Maria D Stephenson, Michaele J Hardie
Sep 12, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Robert D SchmidtMalcolm D E Forbes
Jan 12, 2010·Inorganic Chemistry·Javier J ConcepcionThomas J Meyer

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