Autooxidation of leuco-Methylene Blue – the Role of the Methylene Blue Radicals and Reactive Oxygen Species

• Autorzy: Katafias A. , Koter S.
• Języki publikacji: EN

Abstrakty

EN

Autooxidation of leuco-Methylene Blue to the dye, Methylene Blue, was studied in the 1.9–7.8 pH range under a large molar excess of dioxygen dissolved in the reaction solution using electronic spectroscopy. The synproportionation of the substrate and the reaction product, yielding Methylene Blue radical, plays a key role in the over all redox process. Numerical simulation of the complicated kinetic curves shows that presence of this radical opens an effective reaction path for the autooxidation process and results in coupling of the reaction steps. Reactive oxygen species (HO2 ź /O2 ź - / and H2O2) formed in the examined system are not effective oxidants and do not affect the autooxidation kinetics under applied conditions.

Słowa kluczowe

EN

autooxidation; kinetics; radicals; reaction mechanism; leuco-Methylene Blue

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2009
• Tom: Vol. 83, nr 6
• Strony: 1139--1146
• Opis fizyczny: Bibliogr. 15 poz., rys.

Twórcy

autor

Katafias A.

autor

Koter S.

• Department of Chemistry, N. Copernicus University, 87-100 Toruń, Gagarina 7, Poland *Fax: [phone]; Tel:[phone],

Bibliografia

• 1.            Kryatov S.V., Rybak-Akimova E.V. and Schindler S., Chem. Rev., 105,2175 (2005); Abu-Omar M.M., Loaiza A. and Hontzeas N., Chem. Rev., 105,2227 (2005); Punniyamurthy T, Velusamy S. and Iqbal J., Chem. Rev., 105, 2329 (2005).
• 2.            Liu X. and Theil E.C.,Acc. Chem. Res., 38,167 (2005); Bakac A., Coord. Chem. Rev., 250,2046 (2006); Murray L.J., Garcia-Serres R., Naik S., Huynh B.H. and Lippard S.J., J. Am. Chem. Soc., 128, 7458 (2006); Maiti D., Fry H.Ch., Woertink J. S., Vance M.A., Solomon E.I. and Karlin K.J., J. Am. Chem. Soc, 129,264 (2007); Carvalho N.M.R, AntunesO.A.C.andHornA. Jr., Trans., 1023 (2007).
• 3.            Fabian I. and Csordas V, in Advances in Inorganic Chemistry, ed. van Eldik R. and Hubbard C.D., Academic Press: Amsterdam, 2003, vol. 54, p. 395.
• 4.            Lee S.K. and Mills A., Chem. Comm., 18, 2366 (2003).
• 5.            Mills A. and Wang J., /. Photochem. Photobiol. A: Chem., 127, 123 (1999).
• 6.            Tardivo J.P., Giglio A.D., de Oliveir C.S., Gabrielli D.S., Junqueira H.C., Tada D.B., Severino D.,de Fatima Turchiello R. and Baptista PhD M.S., Photodiagn. Photodyn. Ther., 2, 175 (2005); LeClaire A.C., Mullett T.W., Jahania M.S. and Flynn J.D., Ann. Pharmacother., 39, 373 (2005).
• 7.            Quintao A.D., Coutinho K. and Canuto S.Jnt. J. Quantum Chem., 90,634 (2002) and references therein; Tang W, Xu H., Kopelman R. and Philbert M.A., Photochem. Photobiol, 81, 242 (2005).
• 8.            Floyd R.A, Schneider Jr. J.E. and Dittmer D.P., Antivir. Res., 61, 141 (2004); Wainwright M., Int. J. Antimicrob. Agents, 21, 510 (2003).
• 9.            Impert O., Katafias A., Kita P., Mills A., Pietkiewicz-Graczyk A. and Wrzeszcz G., Dalton Trans., 348 (2003).
• 10.          Kita P. and Jordan B., Inorg. Chem., 24, 2701 (1985).
• 11.          Bakac A. and Espenson J.H., Acc. Chem. Res., 26, 519 (1993).
• 12.          Hay D.W, Martin S.A., Ray A. and Lichtin N.N., J. Phys. Chem., 85, 1474 (1981).
• 13.          Spencer W. and Sutter J.R., J. Phys. Chem., 83, 1573 (1979).
• 14.          Bradic Z. and Wilkins R.G., J. Am. Chem. Soc, 106, 2236 (1984).
• 15.          Goldstein S. andCzapski G, in Free Radicals. A PracticalApproach, eds. PunchardN.A. and Kelly F.J., Oxford University Press: Oxford, 1996, ch. 17, p. 241.