Mechanistic Studies Of The Hydrolysis Of Pyrophosphate Promoted By Tetraaminecobalt(iii) Ions

The hydrolysis of pyrophosphate was investigated at differentrnconcentrations (2X10~3 M, 4X10~3 M and 1(f2 M) of [N4CO(OH)(OH ))2+rn[N. = en2 and tn^ ten = ethylenddiamine, tn = trimathylenediamine)]rn2+ + ' - using Eu /H and OH quenching techniques. The reaction wasrninonitored by measurement of orthophosphate (pi) in quenched aliquotsrnof the reaction mixtures using Malachite Green phosphornolybdaterncomplex as the analytical reagent. The reactive species with regardrnIII to hydrolysis was found to be a 3:1 N^Co ppi complex. The resultsrnshow a relatively larger amounts of degradation products for therndirectly added systems than for those mixed by step wise addition.rnFactors affecting the formation and degradation of the reactivernspecies are discussed and plausible mechanisms are forwarded

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