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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

29.3K
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...
29.3K
Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

9.4K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
9.4K
Valence Bond Theory02:42

Valence Bond Theory

10.3K
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...
10.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.3K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.3K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

46.6K
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 the dxy,...
46.6K
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

4.5K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
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関連する実験動画

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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多面ペロブスキートナノ結晶のためのα-ハロケトン:進化,形状変換,リガンド化学,および自己組み立て

Suman Bera1, Rakesh Kumar Behera1, Narayan Pradhan1

  • 1School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata 700032 India.

Journal of the American Chemical Society
|November 25, 2020
PubMed
まとめ

研究者らは,新しいハライド前駆体を使用して,新しい12面ロムビック・ドデカエドール・ペロブスキートナノ結晶を開発しました. これらの新しい形状は,高い光発光量子収量 (PLQY) と安定性を維持し,新しい研究の道を開きます.

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学について

背景:

  • 鉛ハリドペロブスキートナノ結晶は通常6面ヘキサヘドロン (立方体/血小板) である.
  • 以前の改造は明るさと安定性を高めましたが,六面形の形は維持されました.
  • 多様なナノ結晶の形を持つことは 先進的な応用に不可欠です

研究 の 目的:

  • 従来の六面体を超えた 新しい形状のペロブスキートナノ結晶を合成する
  • ナノ結晶の形態学に対する新しいハライド前駆体 (α-halo ketone in amine) の影響を調査する.
  • 新しく形成されたナノ結晶の高光発光量 (PLQY) と安定性を維持するためです.

主な方法:

  • ホットインジェクション反応のためのハライド前駆体としてのアミンのα-ハロケトンの探索.
  • オーソロンビックCsPbBr3ナノ結晶の合成
  • ナノ結晶の側面,形状,安定性,光学特性の特徴
  • 形質的変異を誘発する annealing 研究.

主要な成果:

  • {200},{020},{112}の側面で安定した,12面のロムビック・ドデカエドール CsPbBr3のナノ結晶を成功して合成した.
  • これらの新しい面は,伝統的な立方形のナノ結晶の {110},{002}面と大きく異なる.
  • ナノ結晶はコロイドと相安定性を維持し,PLQYの単位に近い.
  • 12面の構造を 26面のロムビキュボクタエドロンに変えた
  • 12面のナノ結晶の広域の自己組み立てが観察されました.
  • 先駆体内の三次アンモニアイオンは 独特の側面を安定させました

結論:

  • アミンのα-ハロケトンを用いた新しい合成経路により,多様なペロブスキートナノ結晶の形状が形成されます.
  • 12面のロムビック・ドデカエドルの構造は,安定性を高め,高い排出効率を提供します.
  • これらの発見は,伝統的な形を超えたペロブスキートナノ結晶の研究のための新しいプラットフォームを提供します.