Kinetics and mechanism of the decomposition of [(NH2)2CSNO]+
Abstract
The kinetics of decomposition of 2[(NH2)2CSNO]+ to [(NH2)2CSSC(NH2)2]2++ 2NO˙ have been studied spectrophotometrically in oxygen-free aqueous solutions. Reaction is inhibited by the product, nitrogen(II) monoxide, and the rate equation, based upon initial rates, takes the form shown below. The mechanism involves ν0=k1[CS(NH2)2][(NH2)2CSNO+]+k2[(NH2)2CSNO+]2 parallel pathways, one involving the reversible formation of a radical intermediate, [(NH2)2CSSC(NH2)2]+˙, while the other involves a bimolecular reaction between two molecules of [(NH2)2CSNO]+.