The effect of substituents in the aromatic ring on the half-wave potentials of the polarographic reduction of (t-butyl phenyl ketone)- and (methyl benzoate)-tricarbonylchromiums in dimethylformamide have been studied. The Hammett relationship is satisfactorily obeyed for both series of compounds, and the ϱ values are practically equal to those measured for the analogous uncomplexed substrates. The
研究了芳环中取代基对二甲基甲酰胺中(
叔丁基苯基酮)-和(
苯甲酸甲酯)-三羰基
铬的极谱还原半波电势的影响。对于这两个系列的化合物,均令人满意地遵守了哈米特关系,并且ϱ值实际上等于对类似的非复杂底物测得的值。结果是根据自由基阴离子从自由
配体到配位
配体转变后电子结构的变化来解释的。