Thermal decomposition of iodobenzene using I-atom absorption

The I-atom atomic resonance absorption spectrometric (ARAS) technique has been used in Kr bath gas to study the thermal decomposition kinetics of iodobenzene, C6H5I, over T- and P-ranges of 1082–1416 K and 103–731 Torr, giving the first order expression, k(±60%) = 1.982 × 1011 exp(−23120 K/T)s−1. Two unimolecular theoretical approaches were used to rationalize the data implying E0 = δ H00 = (66.7 ± 0.7) kcal mol−1 and 〈δE〉down = (447 ± 92) cm−1.