键离解能(Bond dissociation energy)缩写为 D0 或 BDE,是绝对零度共价键均裂生成原子自由基反应的变化。[1]乙烷(CH3CH3)为例,C-H键的第一离解能为:

键离解能是键强度的一种量度。键的离解能较小,键更容易裂解。

多原子分子的键离解能与键能是两个不同的概念。

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