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関連する概念動画

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.1K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
3.1K
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

38.8K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
38.8K
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

1.2K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.2K
Organic Compounds03:02

Organic Compounds

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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
54.4K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.2K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.2K

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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カルコーゲン結合の有機構造体

Brian J Eckstein1, Loren C Brown2, Bruce C Noll3

  • 1Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States.

Journal of the American Chemical Society
|November 24, 2021
PubMed
まとめ

σ穴結合の一種であるカルコゲン結合は,新しい多孔有機フレームワーク (ChOF) の作成のための実行可能な接続モードとして実証されています. この発見は,既存のクラスを超えてフレームワークの材料の多様性を拡大します.

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科学分野:

  • 材料科学
  • 超分子化学
  • クリスタルグラフィー

背景:

  • 物質の性質は原子/分子結合によって決定される.
  • 多孔なフレームワークは,接続性に基づいた多様な特性を表します.
  • 既存のフレームワーククラスには限界があり,新しい結合モードが必要である.

研究 の 目的:

  • 毛細なフレームワークにおける新しい接続モードとしてカルコゲン結合を探求する.
  • カルコゲン結合を用いた格子構造のテンプレートを実証する.
  • 分子的にプログラムされた多孔なカルコゲン結合有機フレームワーク (ChOF) を作成するための溶媒条件を合理化する.

主な方法:

  • トリプチーセントリス ((1,2,5-セレナディアゾール) を用いた結晶化研究.
  • σホールの結合相互作用の調査.
  • フレーム形成に対する溶媒の効果の合理化

主要な成果:

  • カルコゲン結合は,低密度の多孔フレームワークの実行可能な接続モードとして確認されています.
  • カルコゲン結合は高エネルギー格子構造を テンプレートにすることができます
  • 分子的にプログラムされた多孔なカルコゲン結合有機フレームワーク (ChOF) を得るために溶媒条件を制御することができます.

結論:

  • σホールの結合,特にカルコゲン結合は,多孔なフレームワーク材料の多様性を拡大します.
  • この研究は,フレームワークの構築に σ 穴結合を使用するための最初の証拠を提供します.
  • 毛細なカルコゲン結合有機フレームワーク (ChOF) は,新しい材料のクラスを表しています.