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相关概念视频

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

27.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
27.6K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

24.2K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
24.2K
Thermal Expansion01:22

Thermal Expansion

4.6K
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
4.6K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

44.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
44.4K
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

1.3K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
1.3K
Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

924
The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
924

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相关实验视频

Updated: Sep 11, 2025

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

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使用电荷相互作用指数预测框架化合物中的热膨胀.

Xin Chen1, Qilong Gao1, Kaiyue Zhao1

  • 1Key Laboratory of Materials Physics of Ministry of Education, School of Physics, Zhengzhou University Zhengzhou 450001 China qilonggao@zzu.edu.cn.

Chemical science
|August 18, 2025
PubMed
概括
此摘要是机器生成的。

我们引入电荷相互作用指数 (CII) 来控制材料中的热膨胀. 这种新方法准确地预测和工程师在开放框架化合物中积极和消极的热膨胀.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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相关实验视频

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 计算材料科学科学 计算材料科学

背景情况:

  • 精确控制热膨胀对于工业应用至关重要.
  • 现有的调整热膨胀的方法是有限的.
  • 开放框架材料提供可调节的特性,但需要新的设计策略.

研究的目的:

  • 开发一个新的参数,电荷相互作用指数 (CII),用于预测和控制热膨胀.
  • 为了建立化学组成和热膨胀行为之间的联系.
  • 证明CII在设计具有所需热膨胀特性的材料中的实用性.

主要方法:

  • 第一个原理计算来确定电荷密度,潜在井曲线和格鲁尼森参数.
  • 合成具有不同组成的新型A2M3O12化合物.
  • 同步射线X射线衍射 (XRD) 作为温度的函数,以实验性测量热膨胀.

主要成果:

  • 发现电荷相互作用指数 (CII) 与横向热振动和低频声波模式有很强的相关性.
  • 计算的CII值准确地预测了合成化合物的热膨胀行为.
  • 在2Mo2.5W0.5O12 (最小CII) 呈现负热膨胀,而 (Al0.2Sc0.2Fe0.2Ga0.2Cr0.2) 2W3O12 (最大CII) 呈现正热膨胀.

结论:

  • 电荷相互作用指数 (CII) 提供了一个简单而有效的策略,用于在开放框架材料中设计热膨胀.
  • CII提供了一个用于设计具有量身定制的热膨胀特性的材料的预测工具.
  • 这项工作为开发用于需要精确热管理的应用的先进材料开辟了新的途径.