Studies on kinetics and mechanism of oxidation of pyridoxal by dichromates in aqueous HClO4 solutions

• Autorzy: Kita E. , Kita P. , Pietkiewicz A. , Wrzeszcz G. , Rozpłoch F.
• Języki publikacji: EN

Abstrakty

EN

Oxidation of pyridoxal (PL) by Cr2O7(2-) ion has been studied using an excess of the aldehyde under air or argon atmospheres. The reaction leads mainly to two Cr(III) complexes: [Cr(PA)(H2O)4](2+) and [Cr(H2O)6](3+) and to uncoordinated pyridoxic acid (PA). The rate of PL oxidation follows a mixed third order rate law: first order in concentrations of Cr(VI), Pl and H3O(+). The reduction of Cr(VI) toCr(III) proceeds through chromium(V) intermediate complex, which has been detected by the EPR method. Mechanism of the reaction has been discussed.

Słowa kluczowe

EN

kinetics; aldehyde oxidation; Cr(III)-pyridoxic acid complexes; EPR; chromium(V); activation parameters

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1998
• Tom: Vol. 72, nr 3
• Strony: 573--581
• Opis fizyczny: Bibliogr. 20 poz., wykr.

Twórcy

autor

Kita E.

autor

Kita P.

autor

Pietkiewicz A.

autor

Wrzeszcz G.

autor

Rozpłoch F.

• Faculty of Chemistry N. Copernicus Uiversity 87-100 Toruń Poland