Comparative Studies on Prussian Blue or Diaquatetraamine- cobalt(III) Promoted Hydrolysis of 4-Nitrophenylphosphate in Microemulsions
نویسنده
چکیده
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] < [(trpn)Co(OH2)2] < [(tme)2Co(OH2)2] [ tn = trimethylenediamine; tme = 1,1,2,2-tetramethyl-1,2-diaminoethane; trpn = tris(3aminopropyl)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]. 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.
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