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为了判别芳杂环基苯基酮电子光谱中双重峰的结构基础,文中对(Ⅰ)(Ⅱ)(Ⅲ)三组六个三岔同系列的同系递变进行了研究,结果表明,所有这些系列的同系直线都分别在双重峰处通过。根据同系直线的相对位置及其通过双峰的长波点或短波点,即可判断各峰所属的基干体系,这就为确定双峰的结构基础提供了一种可靠的定量方法。并用同系直线间的相似三角形法,计算了各组三岔化合物中与羰基直接相连的各种芳杂环的当量△N_s,表明这些基团都只起代基作用。质谱实验结果,芳杂环羰基碎片的丰度都大于苯羰基碎片,而杂环基的碎片则较苯基的小,这表明杂环与羰基的共轭效应较苯基强,这与杂环羰基体系较苯环羰基体系有较长的电子吸收峰是一致的。
In order to determine the structural basis of the double peak in the aromatic spectrum of aromatic heterocyclyl phenyl ketone, the homologous evolution of three groups of three hexagonal series (Ⅰ) (Ⅱ) and (Ⅲ) was studied. The results show that all these Series of homologous lines are passed at the double peak. Based on the relative position of the homologous line and its long-wave point or short-wave point passing through the double peak, the base system to which each peak belongs can be judged, which provides a reliable quantitative method for determining the structural basis of the double peak. The equivalent △ N_s of various aromatic heterocycles directly connected to the carbonyl groups in each group of trifurcation compounds were calculated by the similar triangle method of homologous straight lines, indicating that these groups only played the role of substituents. The results of mass spectrometry showed that the abundances of aromatic heterocyclic carbonyl fragments were greater than those of phenyl carbonyl fragments, while the fragments of heterocyclic groups were smaller than those of phenyl groups, indicating that the conjugation of heterocyclic and carbonyl was stronger than that of phenyl, The carbonyl system is longer than the benzene ring carbonyl system has a long electron absorption peak is consistent.