Electron spin resonance studies of fundamental processes in radiation- and photo-chemistry. Part 6.—The radiolysis of acetic acid
作者:P. B. Ayscough、K. Mach、J. P. Oversby、A. K. Roy
DOI:10.1039/tf9716700360
日期:——
Matrix isolation studies on CH3COOH, CH3COOD and CD3COOD, using e.s.r. to identify trapped radicals, suggest a mechanism for the γ-radiolysis of acetic acid at low temperatures. It is suggested that the primary anion, CH3ÄOOHâ, which is the only species observed at â196°C, dissociates into CH3COâ2 and H, the latter reacting further to give CH3CO and H2O. The molecular cation CH3ÄOOH+ is not observed, but the CH3 radicals observed in acetic acid/water matrices are thought to be decomposition products, together with CO2. The mechanism proposed for radiolysis of the solid is also compatible with product yields obtained from radiolysis of the pure liquid.
对CH3COOH、CH3COOD和CD3COOD的矩阵孤立研究使用电子自旋共振(e.s.r.)识别被捕获的自由基,提出了在低温下醋酸的γ辐射解离机制。研究表明,主要阴离子CH3COOH–是在–196°C时观察到的唯一物种,分解为CH3CO–2和H,后者进一步反应生成CH3CO和H2O。分子阳离子CH3COOH+未被观察到,但在醋酸/水矩阵中观察到的CH3自由基被认为是分解产物,同时生成CO2。提出的固体辐射解离机制与从纯液体辐射解离获得的产物产率也相符。