Cooperativity of binuclear Zn(II) complexes of bisimidazolyl ligands in the hydrolysis of bis(2,4-dinitrophenyl) phosphate in aqueous solution

被引：22

作者：

Kondo, S

Shinbo, K

Yamaguchi, T

Yoshida, K

Yano, Y ^{[1
]}

机构：

[1] Gunma Univ, Dept Chem, Gunma 3768515, Japan

[2] Saitama Med Sch, Dept Chem, Moroyama, Saitama 3500496, Japan

来源：

JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 | 2001年 / 01期

关键词：

D O I：

10.1039/b002395g

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

Hydrolysis of bis(2,4-dinitrophenyl) phosphate (BDNPP) by Zn(II) with ligands bearing plural bis(imidazol-2-yl) groups was kinetically studied in aqueous solution. The binuclear Zn(lr) complex of 1,3-bis(diimidazol-2-yl-hydroxymethyl)benzene (2a) was found to be most effective for hydrolysis of BDNPP (1.2 x 10(3)-fold). ESI-MS study revealed formation of 2a . Zn(II)(2) in MeOH-H2O, suggesting that the rate acceleration is due to so called double Lewis acid activation. The pH-rate profile showed that the pK(a) of the active species is around 7.5. The rate accelerations by the complexes of 2a with other metal ions were 4.3-fold for Ni(II), 7.1-fold for Co(II), and 1.9 x 10(2)-fold for La(III).

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页码：128 / 131

页数：4

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