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関連する概念動画

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

46.7K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
46.7K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

35.8K
VSEPR Theory for Determination of Electron Pair Geometries
35.8K
Valence Bond Theory02:42

Valence Bond Theory

8.9K
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...
8.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.5K
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...
28.5K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.6K
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...
47.6K
Colors and Magnetism03:02

Colors and Magnetism

12.1K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.1K

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関連する実験動画

Updated: May 5, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Published on: March 19, 2017

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高Tc3D有機-無機ペロブスキートの精密な分子設計: [MeHdabco]RbI3 (MeHdabco = N-メチル-1,4-ディアゾニアビサイクロ[2.2.2]オクタン)

Wan-Ying Zhang1, Yuan-Yuan Tang1, Peng-Fei Li1

  • 1Ordered Matter Science Research Center and Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University , Nanjing 211189, People's Republic of China.

Journal of the American Chemical Society
|July 19, 2017
PubMed
まとめ
この要約は機械生成です。

研究者は,dabco (1,4-diazabicyclo[2.2.2]octane) をMeHdabcoに改変することによって,新しい3D有機-無機ペロブスキットを開発した. この新しい材料は 鉄電性と発光性を示し 多機能デバイスの道を開いています

さらに関連する動画

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

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関連する実験動画

Last Updated: May 5, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
08:30

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Published on: March 27, 2018

11.7K

科学分野:

  • 材料科学
  • 固体化学
  • クリスタルグラフィー

背景:

  • 三次元 (3D) 有機無機ペロブスキットは,構造の柔軟性により注目されています.
  • これらの材料に電鉄を誘導することは依然として大きな課題です.
  • 以前は[H2dabco]RbCl3でダブコ (1,4-ディアザビサイクロ[2.2.2]オクタン) を使ったが,フェロ電気的性質は得られなかった.

研究 の 目的:

  • 新しい3Dの有機-無機ペロブスキットを設計し,合成する.
  • 分子対称性の変化が鉄電性体に与える影響を調査する.
  • 多機能デバイスにおける潜在的な応用を探求する.

主な方法:

  • N-メチル-1,4-ディアゾニアビサイクロ[2.2.2]オクタン (MeHdabco) を使用した新しい3D有機-無機ペロブスキートの合成.
  • 結晶構造と相変化の特性
  • 鉄電性および発光特性の評価

主要な成果:

  • 合成されたMeHdabcoベースのペロブスキートは430Kで極性結晶構造と鉄電相転換を示している.
  • これは,3Dペロブスキートケージに改造されたDABCOコンポーネントを成功裏に組み込む最初の試みです.
  • ヨウ素を添加した結晶は,UV刺激下で高量子率 (17.17%) の強いサフラン黄色い発光を示します.

結論:

  • 有機カチオンの分子対称性を修正することは,3Dの有機-無機ペロブスキートにフェロ電気性を誘導するための効果的な戦略です.
  • MeHdabcoベースのペロブスキットは,電鉄発光および多機能装置での応用の可能性を示しています.
  • この研究は3D有機-無機ペロブスキートフェロエレクトリックの家族を拡大します.