Kinetic study of the Ce(III)-, Mn(II)-, or ferroin-catalyzed Belousov-Zhabotinsky reaction with allylmalonic acid

In a stirred batch experiment and under aerobic conditions, ferroin (Fe(phe n)(3)(2+)) behaves differently from Ce(III) or Mn(II) ion as a catalyst for the Belousov-Zhabotinsky (BZ) reaction with allylmalonic acid (AMA). The e ffects of bromate ion, AMA, metal-ion catalyst, and sulfuric acid on the os cillating pattern were investigated. The kinetics of the reaction of AMA wi th Ce(IV), Mn(III), or Fe(phen)(3)(3+) ion was studied under aerobic or ana erobic conditions. The order of reactivity of metal ions toward reaction wi th AMA is Fe(phen)(3)(3+) > Mn(III)> Ce(IV) under aerobic conditions wherea s it is Mn(III)> Ce(IV) > Fe(phen)(3)(3+) under anaerobic conditions. Under aerobic or anaerobic conditions, the order of reactivity of RCH(CO2H)(2) ( R = H (MA), Me (MeMA), Et (EtMA), allyl (AMA), n-Bu (BuMA), Ph (PhMA), and Br (BrMA)) is PhMA > MA > BrMA > AMA > MeMA > EtMA > BuMA toward reaction w ith Ce(IV) ion and it is MA > PhMA > BrMA > MeMA > AMA > EtMA > BuMA toward reaction with Mn(III) ion. Under aerobic conditions, the order of reactivi ty of RCH(CO2H)(2) toward reaction with Fe(phen)(3)(3+) ion is PhMA > BrMA > (MeMA, AMA) > (BuMA, EtMA) > MA. The experiment results are rationalized.