键离解能(Bond dissociation energy)缩写为 D0 或 BDE,是绝对零度时共价键均裂生成原子或自由基的反应中焓的变化。[1]以乙烷(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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