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词汇 Dissociation Energy
分类 英语词汇 英语翻译词典
释义

Dissociation Energy

中文百科

键离解能 Bond-dissociation energy

(重定向自Dissociation Energy)

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。以乙烷(CH3CH3)为例,C-H键的第一离解能为:

\rm \ CH_3CH_2\!-\!H  \ \rightarrow \ CH_3CH_2\cdot \ + \ \cdot H
\rm \ D_0=\Delta H = 101.1 kcal/mol \ \ (423.0 kJ/mol)

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。

英语百科

Bond-dissociation energy 键离解能

(重定向自Dissociation Energy)

In chemistry, bond-dissociation energy (BDE) or D0, is one measure of the strength in a chemical bond. It can be defined as the standard enthalpy change when a bond is cleaved by homolysis, with reactants and products of the homolysis reaction at 0 K (absolute zero). For instance, the bond-dissociation energy for one of the C–H bonds in ethane (C2H6) is defined by the process:

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