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関連する概念動画

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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,...
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Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Intermolecular Forces and Physical Properties02:56

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Molecular and Ionic Solids02:54

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Crystal Field Theory - Octahedral Complexes02:58

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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...
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Updated: Sep 9, 2025

An Externally-Heated Diamond Anvil Cell for Synthesis and Single-Crystal Elasticity Determination of Ice-VII at High Pressure-Temperature Conditions
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核量子効果による原子間距離の変化による六角氷密度依存

Lucas T S de Miranda1, Márcio S Gomes-Filho2, Mariana Rossi3

  • 1Institute of Theoretical Physics, São Paulo State University (UNESP), Campus São Paulo, São Paulo, Brazil.

The Journal of chemical physics
|September 4, 2025
PubMed
まとめ
この要約は機械生成です。

理論的なモデルは 六角氷の密度を過大評価しています 量子核効果は,氷の水素結合を強化することで,この不一致をさらに増幅します.

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Last Updated: Sep 9, 2025

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科学分野:

  • 凝縮物質物理学
  • コンピュータ化学
  • 材料科学

背景:

  • 六角氷 (氷Ih) は,最も一般的な氷の形であり,複雑な性質を示しています.
  • 氷の密度と原子間相互作用の正確な理論モデルは,その振る舞いを理解するために不可欠です.
  • 機械学習の潜在力は 初期精度と古典的な分子動力のスケーラビリティを 橋渡しする有望なアプローチを提供します

研究 の 目的:

  • 機械学習の可能性を用いて氷の構造と振動の性質を調査する.
  • 異なる交換相関関数の影響を氷 Ih シミュレーションで評価する.
  • 氷の密度と水素結合における核量子効果の役割を理解する.

主な方法:

  • 様々な交換-相関関数から派生した機械学習の可能性の開発と適用.
  • 構造と振動の性質に焦点を当てた六角氷 (Ih) のシミュレーション
  • 核量子効果をシミュレーションに含める.

主要な成果:

  • ほとんどのテストされた機能は,実験データと比較して氷の密度を過大評価します.
  • 原子核の量子処理は密度の過大評価を悪化させ,実験値からさらに逸れる.
  • 核量子効果は,水のクラスターや大量の水とは異なり,氷IHの水素結合を強化することが判明しました.

結論:

  • 現在の機械学習の潜在能力は,特に量子核処理では,正確な氷のIH密度の予測のために精細化する必要があります.
  • 原子間相互作用と核量子効果の相互作用を理解することは,氷IHの理論的モデルを改善するための鍵です.
  • 氷 Ih の水素結合に対する核量子効果の明確な影響は,さらなる調査を正当化します.