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D■hne等曾指出,一些2,5—二取代对苯醌Ⅰ可视为两个取代三甲川共轭链Ⅱ的偶合物,如Ⅲ所示.在这一假设基础上,Ⅰ的一些物理、化学性质能得到满意解释.近年来晶体结构测定结果表明,在分子Ⅰ(X=NRR’,O~-)中,C_1-C_2(或C_4-C_5)键长为1.51-1.55(?),反常地长于标准的C_(sp~2)-C_(sp~2)键长值,而C_2-C_3和C_3-C_4键长却明显地均匀化.D(?)hne等最近认为这是偶合假设的又一证明:所讨论的键长均匀化正是
D ■ hne et al have pointed out that some 2,5-disubstituted p-benzoquinone I can be considered as two substituted trimethylammonium conjugate chain Ⅱ, as shown in III. On this assumption, Ⅰ some of the physical , The chemical properties can be satisfactorily explained. The crystal structure determination results in recent years show that the bond length of C 1 -C 2 (or C 4-C 5) is 1.51-1.55 (?) In the molecule Ⅰ (X = NRR ’, O ~ Which is abnormally longer than the standard long-chain C_ (sp ~ 2) -C_ (sp ~ 2) bond while the C_2-C_3 and C_3-C_4 bond lengths are obviously homogenized. Another proof: the key length uniformity discussed is exactly