Catalytic Hydrolysis of Bis(p-Nitrophenyl) Phosphate by Lipophilic Diaquo(Tetraamine) Cobalt(III) in Micellar Solution

Abstract

The catalytic hydrolysis of bis(p-nitrophenyl) phosphate by lipophilic diaquo-(tetraamine)Co(III) complex in Brij35 micellar solution was investigated at 25°C and at pH ranging from 4.1 to 9.0. The results indicated that the Co(III) complex in micellar solution exhibited a great rate enhancement effect on the hydrolysis of bis(p-nitrophenyl) phosphate compared with the Co(III) complex in aqueous solution. This may be explained by the decrease in pK for the dissociation of water molecule of the Co(III) complexes in micellar solution. A kinetic scheme is suggested for elucidating the mechanism.

Keywords:

• Metallomicellar catalysis
• Hydrolysis of phosphate diester
• Kinetics

ACKNOWLEDGMENTS

This work is supported by the Science Foundation of Chongqin and the National Nature Science of China (grant 29873031).