Int. J. Mol. Sci. 2003, 4(6), 362-370; doi:10.3390/i4060362
Article

Comparative Studies on Prussian Blue or Diaquatetraaminecobalt(III) Promoted Hydrolysis of 4-Nitrophenylphosphate in Microemulsions

Chemistry Department, University of South Africa, P.O. Box 392, UNISA, Pretoria 0003, Republic of South Africa
Received: 7 March 2003; Accepted: 10 April 2003 / Published: 31 May 2003
PDF Full-text Download PDF Full-Text [164 KB, uploaded 28 August 2008 16:06 CEST]
Abstract: Comparative reactivities of three diaqua(tetraamine)Co(III) complexes towards hydrolysis of 4-nitrophenyl phosphate was undertaken. The results were contrasted with prussian blue promoted hydrolysis of 4-nitrophenyl phosphate. The tetraamineCobalt(III) complexes accelerated the hydrolytic reaction to varying degrees with the following reactivity order. [(tn)2Co(OH2)2]3+ < [(trpn)Co(OH2)2]3+ < [(tme)2Co(OH2)2]3+ [ tn = trimethylenediamine; tme = 1,1,2,2-tetramethyl-1,2-diaminoethane; trpn = tris(3- aminopropyl)amine].These observations are attributed to the active aquo-hydroxo forms of the tetraamineCobalt(III) complexes. The hydrolysis rate for prussian blue promoted hydrolysis was comparable to that obtained for [(tme)2Co(OH2)2]3+. The mixed valence bimetallic centers of prussian blue aid in substrate binding and organizing the nitrophenyl phosphate for effective intramolecular nucleophilic attack by coordinated hydroxide or water.
Keywords: Nitrophenyl phosphate; Hydrolysis; Microemulsion; TetraamineCobalt(III); Mixed valence bimetallic center

Article Statistics

Load and display the download statistics.

Citations to this Article

Cite This Article

MDPI and ACS Style

Tafesse, F. Comparative Studies on Prussian Blue or Diaquatetraaminecobalt(III) Promoted Hydrolysis of 4-Nitrophenylphosphate in Microemulsions. Int. J. Mol. Sci. 2003, 4, 362-370.

AMA Style

Tafesse F. Comparative Studies on Prussian Blue or Diaquatetraaminecobalt(III) Promoted Hydrolysis of 4-Nitrophenylphosphate in Microemulsions. International Journal of Molecular Sciences. 2003; 4(6):362-370.

Chicago/Turabian Style

Tafesse, Fikru. 2003. "Comparative Studies on Prussian Blue or Diaquatetraaminecobalt(III) Promoted Hydrolysis of 4-Nitrophenylphosphate in Microemulsions." Int. J. Mol. Sci. 4, no. 6: 362-370.

Int. J. Mol. Sci. EISSN 1422-0067 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert