Dinuclear Zn2+ metal complexes based on 1,10-phenanthroline derivates as catalysts for the hydrolysis of 2-hydroxypropyl-p-nitrophenyl phosphate (HPNP) and p-nitrophenyl phosphate (NPP)

摘要

One multidentate ligand, 1,13-di-(1,10-phenanthroline-2-methylene)-1,4,7,10,13-pentaazatridecane(L), has been synthesized and characterized. The kinetics of hydrolysis of 2-hydroxypropyl-p-nitrophenyl phosphate (HPNP) and p-nitrophenyl phosphate (NPP) catalyzed by complexes of L with Zn2+ have been studied. Both Zn2L and Zn2LH?1 had the ability to catalysis a hydrolysis of HPNP and NPP, and the kinetics of hydrolysis of HPNP and NPP were examined in aqueous solution at 25.0 ± 0.1 °C, I = 0.1 mol dm?3 KNO3 at the pH range of 7.0–8.5, respectively. Kinetic studies showed that Zn2LH?1 was a more active species than Zn2L in the hydrolysis of HPNP and NPP. A new mechanism was proposed for the hydrolysis of HPNP and NPP catalyzed by Zn2L and Zn2LH?1.