Electrical and Magnetic Properties of DPPH Iodine Charge Transfer Complex

概要

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A complex between α, α'-diphenyl-β-picrylhydrazyl(DPPH) and iodine is studied on the electrical conductivity, the magnetic susceptibility and the electron spin resonance. The optical absorption of the thin film of the complex shows that the absorption peak of iodine is observed at 400mμ and the absorption peak at 530mμ which is due to the unpaired electron of DPPH decreases with increasing iodine concentration. The ESR singel of the unpaired electron of DPPH also decreases with iodine concentration. Therefore, the unpaired electron of DPPH which is considered to contribute to electrical conduction plays an important role in forming the complex. By introducting iodine into DPPH single crystal as impurity the conductivity of DPPH increases up to as much as 10^3 of that of pure DPPH, and the activation energy becomes smaller than of DPPH and is almost independent of iodine concentration. These phenomena are due to partially ionized DPPH which results from charge transfer structure. The paramagnetic susceptibility of DPPH decreases linearly with increasing iodine concentration and this linearity breaks when the mole ratio of iodine to DPPH is two. From the results of susceptibility measurement, it is suggested that the electron which is transterred to iodine molecule is in diamagnetic state.
社団法人日本物理学会の論文
1968-09-15