对聚氧化键解离的组合效应 聚氧化数据集群中的自由能量
Andreas Towarnicky1, John N El Berch1, Giannis Mpourmpakis1,2
1Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.
The journal of physical chemistry. A
|February 9, 2026
概括
组合效应显著影响聚氧化酸纳米团的氧化键能量. 一个新的统计模型准确地预测了这些能量,改善了化学中的结构-属性关系.
科学领域:
- 化学 化学 化学
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
背景情况:
- 结构属性关系对于现代化学至关重要,包括质子合电子转移 (PCET).
- 实验测量的特性反映了分子组合,忽视这些效应可能会导致理论和实验之间的差异.
- 了解合并效应对于精确的理论预测复杂化学系统至关重要.
研究的目的:
- 调查配置和局部化学环境对多氧化化合物纳米集群中氧化键解离自由能量 (BDFE(O-H)) 的影响.
- 为了比较理论发现与实验数据的具体的多氧化数据系统.
- 为预测BDFE (O-H) 开发准确的模型,以考虑组合效应.
主要方法:
- 密度函数理论 (DFT) 的计算.
- 统计热力学分析.
- 双线建模和开发一种新的,简化的方法.
主要成果:
- 即使在室温下,集成效应也会显著影响BDFE (O-H) 趋势,并且不会被静态DFT完全捕获.
- 开发了一种统计方法,通过列举可访问的H结合点来复制组合效应.
- 一个双线模型以高准确度 (RMSE 0.4 kcal/mol) 协调了实验和理论偏差.
- 一种新的方法将DFT计算减少了98%,同时保持精度在1kcal/mol内.
结论:
- 配置和化学环境效应在聚氧甲酸盐氧化物键能量中起着关键作用.
- 开发的模型提供了快速和高度准确的属性计算,桥梁理论和实验.
- 这项工作为各种原子精确的金属氧化物系统提供了潜在的适用性,并促进了对PCET的理解.
相关概念视频
02:13Bond Dissociation Energy and Activation Energy
11.3K
Bond energy is the energy required to break a bond homolytically. These values are usually expressed in units of kcal/mol or kJ/mol and are referred to as bond dissociation energies when given for specific bonds or average bond energies when indicated for a given type of bond over many compounds. Firstly, the bond dissociation energy for a single bond is weaker than that of a double bond, which in turn is weaker than that of a triple bond. Secondly, hydrogen forms relatively strong bonds with...
11.3K
02:49Bond Energies and Bond Lengths
31.6K
Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Separating any pair of bonded atoms requires energy — the stronger a bond, the greater the energy required to break it.
31.6K
02:11Effects of Temperature on Free Energy
28.4K
The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
28.4K
02:32Bonding in Metals
52.6K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
52.6K
02:45Valence Bond Theory
50.3K
Overview of Valence Bond Theory
50.3K
02:46Covalent Bonding and Lewis Structures
62.0K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
62.0K