Synergistic effect of Ni(II) and Co(II) ions on the sulfite induced autoxidation of Cu(II)/tetraglycine complex

Dalton Transactions : an International Journal of Inorganic Chemistry
Maria V AlipázagaNina Coichev

Abstract

The synergistic effect of Ni(II) and Co(II) on the sulfite induced autoxidation of Cu(II)/tetraglycine was investigated spectrophotometrically at 25.0 degrees C, pH = 9.0, 1 x 10(-5) mol dm(-3) < or = [S(IV)] < or = 8 x 10(-5) mol dm(-3), [Cu(II)]= 1 x 10(-3) mol dm(-3), 1 x 10(-6) mol dm(-3) < or = [Ni(II)] or [Co(II)] < or = 1 x 10(-4) mol dm(-3), [O2] approximately 2.5 x 10(-4) mol dm(-3), and 0.1 mol dm(-3) ionic strength. In the absence of added nickel(II) or cobalt(II), the kinetic traces of Cu(III)G4 formation show a large induction period (about 3 h). The addition of trace amounts of Ni(II) or Co(II) increases the reaction rate significantly and the induction period drastically decreases (less than 0.5 s). The effectiveness of Cu(III)G4 formation becomes much higher. The metal ion in the trivalent oxidation state rapidly oxidizes SO3(2-) to SO3*-, which reacts with oxygen to produce SO5*-. The strongly generated oxidants oxidize Cu(II)G4 to Cu(III).

References

Mar 30, 1977·Journal of the American Chemical Society·F P BossuD W Margerum
Sep 10, 2004·Dalton Transactions : an International Journal of Inorganic Chemistry·María V AlipázagaNina Coichev

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Citations

May 15, 2007·Journal of Pharmaceutical Sciences·Vikram Sadineni, Christian Schöneich
Jun 21, 2005·Luminescence : the Journal of Biological and Chemical Luminescence·Rodrigo Leandro Bonifácio, Nina Coichev
Mar 2, 2005·Dalton Transactions : an International Journal of Inorganic Chemistry·Ruben G M MorenoNina Coichev
May 3, 2014·Metallomics : Integrated Biometal Science·Carlos Angelé-MartínezJulia Brumaghim
Jan 5, 2011·Journal of Inorganic Biochemistry·Larissa C Carvalho do LagoGiselle Cerchiaro

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