Zn(II) coordination to tren-based tris-macrocycles. Activity of their trinuclear Zn(II) complexes in carboxy- and phosphate-ester hydrolysis

被引：15

作者：

Bazzicalupi, C ^{[1
]}

Bencini, A ^{[1
]}

Berni, E ^{[1
]}

Giorgi, C ^{[1
]}

Maoggi, S ^{[1
]}

Valtancoli, B ^{[1
]}

机构：

[1] Univ Florence, Dipartimento Chim, Polo Sci, I-50019 Florence, Italy

来源：

DALTON TRANSACTIONS | 2003年 / 18期

关键词：

D O I：

10.1039/b306577d

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Zn(II) binding by two tren-based tris-macrocycles has been analysed by means of potentiometric measurements in aqueous solutions. Both ligands form stable trinuclear Zn(II) complexes. Deprotonation of Zn(II)-coordinated water molecules gives mono-, di- and tri-hydroxo complexes. The ability of these trinuclear complexes as hydrolytic agents has been tested by using p-nitrophenyl acetate and bis(p-nitrophenyl) phosphate (BNPP) as substrates. BNPP cleavage takes place through a bridging interaction of the substrate with at least two metals and simultaneous nucleophilic attack of a Zn-OH function at phosphorus. A significant increase of the hydrolysis rate with respect to the mononuclear Zn(II) complex with [12]aneN(4), is observed.

引用

页码：3574 / 3580

页数：7

共 90 条

[1] Dinuclear nickel(II) complexes of reduced asymmetric compartmental ligands [J].