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本文研究了N,N,N′,N′-四甲基联苯二胺(NTMB)在不同溶剂中的光诱导电子自旋共振光谱(ESR),分别得到了两种自由基中间体。在极性溶剂中,NTMB与溶剂分子进行电子转移,结果得到NTMB~+的ESR信号为11组多重峰的谱线。在非极性溶剂中,则得到离子自由基对中间体,其ESR信号为单重峰。本文也测定了阳离子自由基NTMB~+在各种溶剂中的半衰期以及ESR信号强度衰减动力学,结果发现,衰减过程符合一级反应的动力学公式。
In this paper, the photo-induced electron spin resonance spectrum (ESR) of N, N, N ’, N’-tetramethylbiphenyldiamine (NTMB) in different solvents was studied and two free radical intermediates were obtained. In polar solvents, NTMB and solvent molecules were electron transfer, resulting in NTMB ~ + ESR signal for the 11 groups of multiple peaks. In nonpolar solvents, ionic free radical pairs are obtained with ESR signals as singlets. The half-life of cationic radical NTMB ~ + in various solvents and the decay kinetics of ESR signal intensity were also determined. It was found that the decay process was in accordance with the kinetic equation of first order reaction.