A Novel BriggsRauscher Oscillation with a Macrocyclic Nickel(II) Complex as Catalyst and Pentane-2,4-dione as the Substrate

A new BriggsRauscher oscillating reaction with a tetraazamacrocyclic nickel(II) complex [NiL](ClO4)2 as catalyst and pentane-2,4-dione (pe) as the substrate is reported. The ligand L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. The experimental results indicate that iodine ion may be an important intermediate, and free radicals can be involved in the reaction. A tentative mechanism based on NoyesFurrow model (NF model) is proposed. Moreover, other factors, such as the variation of concentration of the components and temperature on the oscillator, are discussed.