Abstract
Copper(II)-, Fe(III)-, Zn(II)-, and Mn(II)-3,5-di-iso-propylsalicylate (3,5-DIPS) chelates and Cu(II)2(acetyl-3,5-DIPS)4, and 3,5-DIPS, salicylidene Schiff base chelates Mn(III), Co(II), Ni(II), were kinetically examined as antioxidants in the scavenging of tert-butyl peroxyl radical (\(tert - {\text{butylOO}}^{ \bullet }\)) in non-polar and polar aprotic solvents. Using kinetic EPR method absolute rate constants and corresponding Arrhenius parameters were determined for reactions of \(tert - {\text{butylOO}}^{ \bullet }\) with these chelates in the temperature range from − 63 to − 11 °C. It was established that the order of anti-\(tert - {\text{butylOO}}^{ \bullet }\) reactivity is: Mn(II)(3,5-DIPS)2 >> Cu(II)2(3,5-DIPS)4 > Fe(III)(3,5-DIPS)3 > Zn(II)(3,5-DIPS)2 >> Cu(II)2(acetyl-3,5-DIPS)4 and 3,5-DIPS acid. Mn(II)(3,5-DIPS)2 caused the most rapid removal rate for \(tert - {\text{butylOO}}^{ \bullet }\) as a result of the oxidation of Mn(II) to Mn(III) by \(tert - {\text{butylOO}}^{ \bullet }\). The reaction of \(tert - {\text{butylOO}}^{ \bullet }\) with Cu(II)2(3,5-DIPS)4, Zn(II)(3,5-DIPS)2 and Fe(III)(3,5-DIPS)3 is due only to hydrogen atom abstraction from the ligand phenolic OH group by \(tert - {\text{butylOO}}^{ \bullet }\), owing to their activation by the metalloelement through weakening the intramolecular hydrogen bond. High reactivity of \(tert - {\text{butylOO}}^{ \bullet }\) with Mn(III) and Co(II) salicylidene Schiff base chelates was established. These salicylidene Schiff base chelates react in a 1:1 stoichiometric ratio with \(tert - {\text{butylOO}}^{ \bullet }\) without free radical formation and with the single-electron oxidation of central metalloelements. It is concluded that removal of alkylperoxyl radical by Cu(II)-, Fe(III)-, Zn(II)-, and Mn(II)-3,5-di-iso-propylsalicylate chelates, Mn(III) and Co(II) salicylidene Schiff base chelates may partially account for their biological activities.
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Acknowledgements
This work is financed by State Committee of Science of Armenia (Basic Research program). The authors are grateful to colleagues from the United States, especially prof. J.R.J. Sorenson and prof. F.T. Greenaway, and colleagues of the Laboratory “Liquid phase free radical reactions and organic compounds oxidation” of the Institute of Chemical Physics of the National Academy of Sciences, Republic of Armenia, thanks to scientific collaboration with whom the results presented in this work were obtained.
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Tavadyan, L.A., Musaelyan, M.V., Stepanyan, A.B. et al. Kinetic EPR-Studies of the Anti-Peroxyl Radical Reactivities with Various Metallochelates of 3,5-Di-Iso-Propylsalicyalte and Salicylidene Schiff Base. Appl Magn Reson 51, 1049–1069 (2020). https://doi.org/10.1007/s00723-020-01234-w
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DOI: https://doi.org/10.1007/s00723-020-01234-w