After extending the cleaving-redeformation model for estimating the bond energies, a method for estimating the enthalpy changes of forming carbene has been put forward. 本文推广了计算化学键能的劈裂更变模型,提出了一种估算生成卡宾的焓变的方法。
Though this way is different from those in which the bond enthalpy and equilibrium dissociation energy De can be obtained, the results of calculation are well in accord with experiment values of De. 该方法虽有别于求键焓和平衡离解能De,但计算结果和De的实验值甚相符合。
Compared with experimental data of bond enthalpy, the calculated results by DFT coincide well. 比较键焓计算的数据与相应的实验数据,发现DFT计算结果与实验结果吻合得较好;
Theoretical calculation of bond dissociation energy and enthalpy of formation for trinitromethane 三硝基甲烷键离解能和生成焓的理论计算
( SiHmXn, g) is related to bond enthalpy and bond numbers ( m, n) of Si H and Si X bond. (SiHmXn,g)与SiH键和SiX键的键焓及键数(m,n)有关。
With the increase of hydrophile and the number of peptide bond, the concentration range of hydration decreases. The contributions of the hydrophobic side chains of the amino acids to the transfer enthalpy are positive. 随表面活性剂头基亲水性的增强和肽分子中肽键的增多,去水化作用范围减小;随氨基酸疏水侧链体积的增大,对迁移焓的正贡献增强。
The hydrophilic side chains and peptide bond enhance the negative values of the transfer enthalpy. In contrast, the hydrophobic side chain has positive contributions to the transfer enthalpy. 氨基酸的亲水侧链和肽的肽键对迁移焓有负贡献,氨基酸疏水侧链对迁移焓有正贡献。