The Mechanism of the base catalysed carbonato ring opening of cis-[Co(cyclen)CO3]+

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Abstract

The kinetics of carbonato ring opening of cis-[Co(cyclen)CO3]+ (cyclen = 1,4,7,10-tetraazacyclododecane) in basic solution has been studied in detail over a temperature range. The reaction shows a complex dependence on the hydroxide ion concentration with both first and second order terms in [OH] occurring. The observed first order rate constant kobs is given by the equation

Values of k1K1 and k2K1K2 have been obtained and the apparent activation parameters determined. A mechanism is developed which can rationalise all the kinetic data.

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