The kinetics of the hydrolysis of p-nitrophenyl picolinate(PNPP) catalyzed by zinc complex of schiff base macrocyclic polyamine(Zn2+ complex of 1,4,7,10,13,16-hexaazacyclooctadeca-1,3,10,12-tetraene was abbreviated to...The kinetics of the hydrolysis of p-nitrophenyl picolinate(PNPP) catalyzed by zinc complex of schiff base macrocyclic polyamine(Zn2+ complex of 1,4,7,10,13,16-hexaazacyclooctadeca-1,3,10,12-tetraene was abbreviated to ZnL2+)were studied at 25℃and pH=7.00.The pseudo-first-order rate constant(kψ)of the catalytic PNPP hydrolysis was 8.85×10-3 s-1,which was 463 times larger than that of the spontaneous hydrolysis of PNPP at pH=7.00.The effect of surfactants(Brij35,CTAB,and SDS),pH,temperature,and the concentration of ZnL2+ on the PNPP hydrolysis catalyzed by ZnL2+ was also studied in present paper.The thermodynamic and kinetic parameters of the titled reaction were obtained with the mathematical model.The activated water molecule in the reactant-catalyst complex was a strongly nucleophilic species,which could promote the PNNP hydrolysis reaction effectively.展开更多
文摘The kinetics of the hydrolysis of p-nitrophenyl picolinate(PNPP) catalyzed by zinc complex of schiff base macrocyclic polyamine(Zn2+ complex of 1,4,7,10,13,16-hexaazacyclooctadeca-1,3,10,12-tetraene was abbreviated to ZnL2+)were studied at 25℃and pH=7.00.The pseudo-first-order rate constant(kψ)of the catalytic PNPP hydrolysis was 8.85×10-3 s-1,which was 463 times larger than that of the spontaneous hydrolysis of PNPP at pH=7.00.The effect of surfactants(Brij35,CTAB,and SDS),pH,temperature,and the concentration of ZnL2+ on the PNPP hydrolysis catalyzed by ZnL2+ was also studied in present paper.The thermodynamic and kinetic parameters of the titled reaction were obtained with the mathematical model.The activated water molecule in the reactant-catalyst complex was a strongly nucleophilic species,which could promote the PNNP hydrolysis reaction effectively.
