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一、引言人們早就注意到,具有共軛体系的分子常常表現出一系列不同于其他化合物的特性。对于这些分子的結构及其性质的研究,在理論上和实用上都具有非常重要的意义。大家知道,分子的性质依赖于它的化学結构;从电子观点来說,分子的化学結构是与它的电子密度分布情况相适应的。在共軛体系中,由于存在着特殊的原子间的相互影响,使分子中电子密度的分布发生了一定程度的变化。变化的情况由共軛体系的化学結构所决定。在共軛体系中所发生的电子密度分布的改变,与一般的誘导效应有着本貭上的区別,通常称为共軛效应。
I. INTRODUCTION It has long been observed that molecules with conjugated systems often exhibit a series of properties that are different from other compounds. The study of the structure and properties of these molecules is of great theoretical and practical significance. We all know that the nature of a molecule depends on its chemical structure; from an electronic point of view, the chemical structure of a molecule is adapted to its electron density distribution. In the conjugated system, due to the existence of a special interaction between atoms, the electron density distribution in the molecule has undergone some changes. The change is determined by the chemical structure of the conjugated system. The changes in the electron density distribution that occur in the conjugated system have a fundamental difference from the general inductive effect and are often referred to as conjugation effects.