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Kosower的极性标度Z值在化学中已广泛采用,并已对其电荷转移吸收带的溶剂依赖性作了详细讨论.吡啶鎓盐碘化物之所以能用于极性探针是基于形成电荷转移配合物,然后经电子转移转变成紧密的自由基对.
Kosower’s Polarity Scale Z values are widely used in chemistry and have been discussed in detail for the solvent dependence of their charge-transfer absorption bands. The reason why pyridinium salt iodides are used for polar probes is based on the formation of charges The complex is transferred and then converted to a close free radical pair by electron transfer.