揭示了非传统的CH4-Xe化合物及其在极端条件下的热力学特性
Pan Zhang1,2, Yuelong Ding1, Wenwen Cui1
1Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China.
The Journal of chemical physics
|July 1, 2024
概括
高压使 (Xe) 等惰性气体能够与甲 (CH4) 形成新型化合物. 研究人员预测了四种新的稳定的CH4-Xe化合物,在极端条件下揭示了复杂的结构和相变.
科学领域:
- * 用于计算的材料科学.
- * 高压化学 高压化学
- * 星球科学 星球科学
背景情况:
- *惰性气体通常不反应,在极端条件下可以形成化学化合物.
- *以前的研究已经探索了高压化学,但CH4-Xe化合物仍然基本上没有特征.
- * 了解这些相互作用对于行星内部模型至关重要.
研究的目的:
- *以计算方式预测在高压下甲 (CH4) 和 (Xe) 之间形成的新型稳定化合物.
- * 调查这些预测化合物的结构,热力学和动态特性.
- * 在不同温度和压力下探索CH4-Xe系统的相变和化学行为.
主要方法:
- *第一原则计算以确定电子结构和能量.
- * 晶体结构预测算法,以识别稳定的固态度.
- * Ab initio分子动力学模拟以研究温度驱动的相变.
主要成果:
- *四个新的稳定的CH4-Xe化合物 (CH4Xe3, (CH4) 2Xe, (CH4) 3Xe和 (CH4) 3Xe2) 在2100GPa时被预测出来.
- * 结构包括孤立的 Xe 原子和 CH4 分子,其中 (CH4) 3Xe2 形成聚合的 C3H8 和 H2.
- *高压诱导独特的固体-塑料-流体和超声波相变随着温度的增加.
- *在更高的压力下,更强的Xe-C相互作用会导致CH4Xe3和 (CH4) 3Xe2.2中的超离子状态.
结论:
- * 这项研究扩大了已知的甲-化合物家族.
- *这些发现为CH4-Xe混合物在极端压力下的复杂化学和相位行为提供了洞察力.
- *结果有助于了解行星内部的组成和演变,特别是冰体.
相关概念视频
Noble Gases
17.4K
The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
17.4K
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
44.2K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
44.2K
Conformations of Butane
14.1K
Unlike ethane and propane that have only two major conformations, butane has more than two conformers. The staggered form of butane in which the bulky methyl groups on the two carbons are placed on opposite sides, that is, at a dihedral angle of 180°, is the lowest energy, most stable form — called the anti conformer. This conformation is stabilized due to the absence of steric repulsion between the largely spaced out methyl groups. The other two staggered conformations are...
14.1K
Conformations of Ethane and Propane
13.9K
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
13.9K
Radical Anti-Markovnikov Addition to Alkenes: Thermodynamics
1.9K
The anti-Markovnikov addition of hydrogen halides to an alkene is thermodynamically feasible only with HBr. The radical addition reaction with other hydrogen halides like HCl and HI is thermodynamically unfavorable.
1.9K
Radical Halogenation: Thermodynamics
3.8K
The thermodynamic favorability of a reaction is determined by the change in Gibbs free energy (ΔG). ΔG has two components- enthalpy (ΔH) and entropy (ΔS). The entropy component is negligible for alkane halogenation because the number of reactants and product molecules are equal. In this case, the ΔG is governed only by the enthalpy component. The most crucial factor that determines ΔH is the strength of the bonds. ΔH can be determined by comparing the energy...
3.8K


