吸诱导的凝性伊米达酸结构转变框架-8:一个混合分子模拟研究研究
Liling Zhang1, Zhongqiao Hu, Jianwen Jiang
1Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials, Soochow University, Suzhou, Jiangsu, 215123, China. llzhang@suda.edu.cn
Journal of the American Chemical Society
|February 22, 2013
概括
一种新的模拟方法揭示了 (N2) 吸附如何导致氧化伊米达酸框架-8 (ZIF-8) 的结构变化. 这种由N2相互作用驱动的过渡解释了ZIF-8的作用.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 氧化伊米达酸框架-8 (ZIF-8) 是一种高度多孔的材料,在气体储存和分离方面具有潜在的应用.
- 在客分子吸附下了解ZIF-8的结构行为对于优化其性能至关重要.
研究的目的:
- 使用先进的模拟技术研究由 (N2) 吸附诱导的ZIF-8的结构转变.
- 阐明这种结构转变背后的微观机制.
主要方法:
- 为ZIF-8和N2相互作用量身定制的新力场的开发.
- 应用混合蒙特卡洛/分子动力学模拟方法.
- 对结构参数,潜在能量贡献和辐射分布函数的分析.
主要成果:
- 在高N2负载下观察到ZIF-8从低负载 (LL) 到高负载 (HL) 阶段的明显结构过渡.
- 模拟预测了三个区域的分级吸附等热体,与实验观测一致.
- 在过渡过程中发现了意达酸盐环方向,框架原子运动和潜在能量组件的显著变化.
结论:
- 在N2吸附后ZIF-8的结构转变主要是由伊米达酸盐环的重定位驱动的.
- 增强的N2和伊米达酸盐环之间的范德瓦尔斯相互作用,以及减少的框架扭力相互作用,有助于过渡到HL结构.
- 这项研究为ZIF-8的连续结构转变提供了第一个分子模拟洞察力,揭示了底层机制.
相关概念视频
Resonance and Hybrid Structures
25.5K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
25.5K
Molecular Structure and Acidity
20.4K
An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
20.4K
Lewis Structures of Molecular Compounds and Polyatomic Ions
44.8K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
44.8K
UV–Vis Spectroscopy: Molecular Electronic Transitions
2.8K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
2.8K
Acid Strength and Molecular Structure
32.9K
Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
32.9K
Phase Transitions
22.7K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
22.7K


