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Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

38.0K
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
38.0K
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

7.1K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
7.1K
VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

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Overview of VSEPR Theory
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.9K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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VSEPR Theory and the Effect of Lone Pairs04:01

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Effect of Lone Pairs of Electrons on Molecule Geometry
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Coordination Number and Geometry02:57

Coordination Number and Geometry

19.2K
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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関連する実験動画

Updated: Feb 20, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

11.2K

平面六角座標の硫黄とセレニウム.

Ya-Xuan Cheng1, Li-Xia Bai1, Jin-Chang Guo1

  • 1Institute of Molecular Science, Shanxi University, Taiyuan 030006, China.

The Journal of chemical physics
|February 18, 2026
PubMed
まとめ
この要約は機械生成です。

研究者は,最初の平面六合座標硫黄とセレニウム (phS/Se) クラスター,X©Li6H62-.を予測しました. これらの安定した構造は,カルコゲンのための従来の調整限界に挑戦します.

さらに関連する動画

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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関連する実験動画

Last Updated: Feb 20, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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科学分野:

  • コンピューティング・ケミストリー
  • 無機化学 無機化学とは
  • マテリアルサイエンス 材料科学

背景:

  • 平面六坐標原子の達成は化学における大きな課題である.
  • 硫黄やセレニウムのようなカルコゲン元素は,通常,より低い調整数を示します.

研究 の 目的:

  • 新しい平面六合座標硫黄とセレニウム (phS/Se) クラスタを予測し,特徴づけること.
  • このユニークな種の構造的安定性と結合性の性質を調査する.

主な方法:

  • 高レベルの定量的な電子構造計算.
  • 安定性評価のためのボーン・オッペンハイマー分子動力学シミュレーション.
  • 結合分析のためのエネルギー分解分析 - 化学的バレンスの自然軌道 (EDA-NOCV).

主要な成果:

  • 最初の平面六合座標硫黄とセレニウムクラスター,X©Li6H62- (X = S, Se) が計算的に予測されました.
  • これらのクラスターは,安定したシングレットD6h対称構造を採用し,中央のS/Se原子がLi6六角に結合し,それ自体が水素原子で覆われています.
  • 結合分析により,単一のペア,非局所化されたシグマ結合,および安定に寄与する多中心のイオン結合を含むユニークな電子構造が明らかになった.

結論:

  • 予測されたphS/Seクラスターは,カルコゲン元素の協調化学を拡張し,突破口を表しています.
  • これらの平面六坐標構造の高い安定性は,ダイナミックシミュレーションによって確認されました.
  • これらの発見は,理論的および実験的研究の両方において,新しい平面六座標複合体の探索のための新しい道を開く.