三氧化硫分子中有一个四中心六电子的离域π键,请详细解释一下什么叫做四中心六电子?

2025-03-16 00:40:23
推荐回答(3个)
回答1:

你好,


S和O都是sp2杂化,O也是如此,其中O未成键的杂化轨道中各含有2个电子(即饱和)S与O形成三个σ键,这是其基本骨架。实验光谱测得SO3分子中的S—O键是等长的,所以体系中存在一种使键长平均化的键,也就是大π键(与苯环类似),至于其电子的算法,SO3分子中一共有6×4=24个价电子,其中三个σ键用去6个,三个O原子各有2个未成键的杂化轨道,含有3×2×2=12个电子,所以大π键中含有6个电子。

这六个电子,并不是围绕哪一个原子运动,而是在整个SO3分子中运动。

至于中心,即参与大π键的原子,他们都为大π键提供一个相互平行的p轨道,六电子表示在这些原子所组成的“共轭”p轨道中填充了6个电子。

希望对你有所帮助!

不懂请追问!

望采纳!

回答2:

三个氧一个硫共4个中心,共用6个电子形成离域键

回答3:

四个原子共用6个电子。

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