Formation of singlet molecular oxygen by the Radziszewski reaction between acetonitrile and hydrogen peroxide in the absence and presence of ketones
Abstract
Measurements of the infrared phosphorescence of singlet molecular oxygen (1O2) at 1270 nm have been used to demonstrate the formation of 1O2 by the Radziszewski reaction between O)NH2
+ 0.5 1O2. The rate constant of the heterolytic decomposition of PAIA was determined to be k8
= 1.2 × 10−3 dm3 mol−1 s−1 at T
= 30 °C. From the measurements at different pH values in the range 9.1 < pH < 12.0 the pKa(PAIA) value was estimated to be 11.1 at T
= 30 °C. The investigation of the reaction between