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合成了3个系列芳香类含碳一氧键的化合物,用循环伏安法测定了相关的氧化还原电势,通过热力学循环首次估测了负离子基的碳—氧键的断裂能量(ΔH(cleav)[C-O](·-)).结果表明:得到1个电子形成负离子基可以活化碳—氧键.这与具有相同结构的正离子基的情况是一致的,但其活化程度略小.相关分析表明:ΔH(cleav)[C-O](·-)vs(ΔE(red)[C-O]+ΔpKa[HA])和ΔH(clesv)[C-O](·+)vs.(ΔBDE-ΔE(ox)[C-O])均呈线性.讨论了负离子基和正离子基及其母体化合物中键的特征,并与文献中有关的键能数据进行了比较。
Three series of aromatics compounds with carbon monoxide bond were synthesized. The redox potential was determined by cyclic voltammetry. The energy (ΔH (cleav) [C-O] (- -)). The results show that one electron can form anions to activate carbon-oxygen bond. This is consistent with the case of the positive ion group of the same structure, but with a lesser degree of activation. Correlation analysis showed that: ΔH (cleav) [C-O] (· -) vs (ΔE (red) [C-O] + ΔpKa [HA]) and ΔH (clesv) [C-O] (· +) vs. (ΔBDE-ΔE (ox) [C-O]) are linear. The characteristics of the bonds in anions and cations and their parent compounds are discussed and compared with those in the literature.