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2 Polish Journal of Chemistry

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Kinetic Studies of Nitric Oxide Uptake in Co(II)-Dipeptide-NO-OH- Systems by the Stopped-Flow Method

Kufelnicki A., Jaciubek-Rosińska J.

Polish Journal of Chemistry

2006

Vol. 80, nr 5

783-790

The known up to now reactions of NO uptake by cobalt(II) chelates with selected dipeptides, observed previously by classic volumetric and pH-metric measurements, were now investigated kinetically by using the rapid kinetics stopped-flow method. The kinetic results could have been correlated with the reversibility of nitrosylation (estimated spectrophotometrically in the near IR after re-argonation).

Reversible Uptake of Nitric Oxide in Co(II)-Dipeptide-NO-OH- Systems

Kufelnicki A., Jaciubek J.

Polish Journal of Chemistry

2001

Vol. 75, nr 12

1905-1911

Uptake of nitric oxide by cobalt(II) chelates with selected dipeptides was iiwestigated by volumetric and spectrophotometric methods (UV, VIS). The temperaturę was reduced to ~0°C in order to inhibit the autooxidation of Co(II) to Co(III). The stoichiometry of NO addition and the reversibility of the reaction (by re-acidification and re-argonation) were investigated as well. The reaction was reversible in a varying degree depending on the kind of amino acid side groups used. The kinetic stability of the formed NO adducts was followed spectrophotometrically. Present and previous results, concerning fixation of dioxygen in similar systems, arę compared.