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Titolo:
Cooperativity of binuclear Zn(II) complexes of bisimidazolyl ligands in the hydrolysis of bis(2,4-dinitrophenyl) phosphate in aqueous solution
Autore:
Kondo, S; Shinbo, K; Yamaguchi, T; Yoshida, K; Yano, Y;
Indirizzi:
Gunma Univ, Dept Chem, Gunma 3768515, Japan Gunma Univ Gunma Japan 3768515 nma Univ, Dept Chem, Gunma 3768515, Japan Saitama Med Sch, Dept Chem, Moroyama, Saitama 3500496, Japan Saitama Med Sch Moroyama Saitama Japan 3500496 ma, Saitama 3500496, Japan
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
fascicolo: 1, , anno: 2001,
pagine: 128 - 131
SICI:
1472-779X(200101):1<128:COBZCO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIESTER TRANSESTERIFICATION; ZINC(II) COMPLEX; DINUCLEAR; MODELS; CATALYSTS; EFFICIENT; RNA; CONSTANTS; CLEAVAGE; ENZYMES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Yano, Y Gunma Univ, Dept Chem, Gunma 3768515, Japan Gunma Univ Gunma Japan 3768515 , Dept Chem, Gunma 3768515, Japan
Citazione:
S. Kondo et al., "Cooperativity of binuclear Zn(II) complexes of bisimidazolyl ligands in the hydrolysis of bis(2,4-dinitrophenyl) phosphate in aqueous solution", J CHEM S P2, (1), 2001, pp. 128-131

Abstract

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) inMeOH-H2O, suggesting that the rate acceleration is due to so called doubleLewis 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 1.9x 10(2)-fold for La(III).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 19:44:47