Acid hydrolysis of iminodiacetatotetraam-mine cobalt(III), [Co(NH3)4idaH](CIO4)2 complex

Abstract

The acid catalysed dissociation of iminodiacetatotetra-ammine cobalt(III) complex has been studied in the [HNO₃] range of 0.05-0.40 mol.dm^-3 at <em>1</em>= 0.50 mol. dm^-3 (NaNO₃), in the temperature range 35-50ᵒC. The reaction exhibits a solvent deuterium-isotope effect <em>k<ub><img src='http://www.niscair.res.in/jinfo/equation89.gif' border=0></sub></em>/<em>k_{<img src='http://www.niscair.res.in/jinfo/equation88.gif' border=0>}</em> = 2.32 at 40°C.The solvent deuterium isotope effect is consistent with rapid pre-equilibrium protonation followed by rate deter in ring opening, and excludes a mechanism involving concerted attack by [H₃O] .The magnitude of the solvent isotope effect, suggests an A-1 type reaction to give a five-coordinate intermediate.