ABSTRACT
The effects of dioxocyclam Zn3 ion complexes in micellar solution on ihe hydrolysis of PNPP have been investigated in this paper. Second order rate constants of Ihe hydrolysis of PNPP catalyzed by dio*ocyclam Zn2+ion complexes at various pH and the deprotonation constants of H2 cooriinated to the dioxocyclam Zn2+ion complexes pKwere determined kinetically, and the catalytic mechanism was discussed. The results unexpectedly showed that the activation was much larger for Itpophilic ligand under miccllar condition than for bydrophilic ligands under non-miccllar conditions, indicating the dioxocyclam Zn2+ ion complex to be an excellent model of carbonic anhydnue.