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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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,...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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2次元調整フレームワークにおける固有の陽子伝導.

Daiki Umeyama1, Satoshi Horike, Munehiro Inukai

  • 1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, Japan.

Journal of the American Chemical Society
|July 13, 2012
PubMed
まとめ
この要約は機械生成です。

この研究は,新しい協調ネットワークにおける固有の陽子伝導性を実証しています. この素材は,フォスファート・リガンドの回転によって促進される,グロットフス型陽子ジャンプを示している.

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

関連する実験動画

Last Updated: May 20, 2026

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
05:51

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

Published on: July 19, 2019

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

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Published on: December 16, 2013

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

科学分野:

  • マテリアルサイエンス 材料科学
  • 無機化学 無機化学とは
  • 固体化学 固体化学

背景:

  • 陽子伝導は,燃料電池などのエネルギーアプリケーションに不可欠です.
  • 効率的な陽子伝導性を有する新しい材料を開発することは,継続的な課題です.
  • コーディネーションポリマーは,機能特性を考慮して調整可能な構造を提供します.

研究 の 目的:

  • 陽子伝導のための新しい協調ポリマーを合成し,特徴づけること.
  • 材料内の陽子輸送のメカニズムを調査する.
  • プロトン伝導体としての協調ネットワークの潜在能力を探求する.

主な方法:

  • Zn(2+),1,2,4-トリアゾール,オーソフォスファートを用いた協調ポリマーの合成.
  • 二次元の層状化合物の構造的特徴.
  • 陽子の伝導性を測定するために,粉末と単結晶のインペデンススペクトロスコーピー.
  • 導電機構を決定するためにアクティベーションエネルギーの分析.

主要な成果:

  • 2D層構造を持つ新しい協調ポリマーが成功裏に合成されました.
  • 層に並行して,内在の陽子伝導性が観察されました.
  • 伝導機構は,Grotthuss型陽子ジャンプとして特定されました.
  • 低活性化エネルギーは,リン酸リガンドの回転によって促進される効率的な陽子ジャンプを示した.

結論:

  • 協調ネットワークは,固有の陽子伝導性を示すことができる.
  • 合成された材料は,陽子伝導体としての潜在能力を示しています.
  • リガンドの回転のような構造的特徴の役割を理解することは,効率的な陽子伝導材料の設計の鍵です.