本文用ESR方法研究了六种新的双吡啶盐(PQ)与CdS的水及非水悬浮体系间的非均相光诱导单电子转移过程。结果表明,在λ<520nm的光照射下,CdS价带中的电子被激发至导带,再转移至PQ~(++)使之还原为PQ~+自由基,呈现明显的ESR信号。当体系中有电子给体EDTA存在时,有电子从EDTA转移至CdS价带的正空穴,价带中的电子吸收光子跃迁至导带再转移至PQ~(++),以生成更多的PQ~+,从而使ESR信号大大增强。 In this paper, the heterogeneous photoinduced single electron transfer between six novel bispyridinium salts (PQ) and CdS in aqueous and non-aqueous suspensions has been studied by ESR method. The results show that under the light irradiation of λ <520nm, the electrons in CdS valence band are excited to the conduction band and then transferred to PQ ~ (++) to reduce to PQ ~ + free radicals, showing obvious ESR signal. When EDTA is present in the system, electrons move from EDTA to the positive holes in the CdS valence band. The electron absorption photons in the valence band migrate to the conduction band and then transfer to PQ ++ to generate more Of PQ ~ +, so that the ESR signal is greatly enhanced.