Electron Spin Resonance Study of Radical Pairs Trapped in X‐Irradiated Single Crystals of Dimethylglyoxime‐O,O‐d2, Glyoxime, and Methylglyoxime at Liquid‐Nitrogen Temperature

摘要: The ESR spectra of x‐irradiated single crystals dimethylglyoxime‐O,O‐d2, glyoxime, and methylglyoxime have been measured at 77°K. An analysis the reveals presence radical pairs R1—CR2NȮ···R1—CR2NȮ , where R1=C(CH3)NOD R2=CH3 for dimethylglyoxime‐d2 (the average distance between unpaired electrons R=5.4 A), R1=CHNOH R2=H glyoxime (R≦4.8 (R≦5.2 A). Radical decay in dimethylglyoxime faster than dimethylglyoxime‐d2. fact shows that iminoxy radicals CR1NOH–CR2NȮ diffuse by hydrogen‐atom abstraction from nearby hydroxyl groups.