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Studies on mechanism of 2-pyridinecarboxaldehyde oxidation by dichromates in strongly acidic aqueous solutions. The unusual reaction order on concentration of the aldehyde

Kita E., Kita P., Uścińska G.

Polish Journal of Chemistry

1998

Vol. 72, nr 8

1949-1957

2-Pyridinecarboxaldehyde (pyad) has been oxidized by Cr2O7(-2) ion at pH range 0-1 to 2-pyridinecarboxylic acid (pyac). The produced CR(III) exists in the form of three complex ions: [CR(pyac)(H2O)4](2+), [Cr(pyac)2(H2O)2](+) and [Cr(H2O)6](3+). The reaction follows unusual mixed fourth-order rate law: first-order on concentrations of H(+)-aq and CR(VI) and second-order on concentration of the aldehyde. Mechanism of the reaction has been discussed.