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Details van artikel 113 van 189 gevonden artikelen
| Titel: |
Phosphate Monoester Cleavage with Dinuclear Zinc(II) and Copper(II) Macrocyclic Complexes in Micellar Solution |
| Auteur: |
Juan, Du Xiangguang, Meng Wei, Hu Xiancheng, Zeng |
| Verschenen in: |
Journal of dispersion science and technology |
| Paginering: | Jaargang 28 (2007) nr. 2 pagina's 199-206 |
| Jaar: |
2007-02-01 |
| Inhoud: |
Homodinuclear and heterodinuclear Zn(II) and Cu(II) complexes derived from macrocyclic ligand (1) have been kinetically examined as catalysts for the hydrolysis of phosphomonoester p-nitrophenyl phosphate (pNPP) in Brij35 micellar solutions. Kinetic data indicated that the aquo-hydroxy form of the dinuclear complex was the active species and the metal-coordinated hydroxide nucleophile attacked the substrate in the hydrolysis reaction in a fashion of intramolecule nucleophilic reaction. Two oxygens of pNPP associated with the two metal centers of the dinuclear complex, and in this case the metal ions exerted a double Lewis acid effect. Different structure requirements of metal ions and nucleophilicity of M-OH species determined the activity sequence of the three dinuclear complexes. The rigid and compact geometry of these complexes hindered their catalytic effects in the hydrolysis of phosphodiester bis(p-nitrophenyl) phosphate (BNPP). |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 113 van 189 gevonden artikelen
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