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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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Isomerism02:43

Isomerism

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Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
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Isomerism in Alkenes02:01

Isomerism in Alkenes

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Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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ポリマーバレンスのイソメリズム:ポリ (Dewar-o-xylylene)

Rong Zhu1, Timothy M Swager1

  • 1Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States.

Journal of the American Chemical Society
|April 10, 2018
PubMed
まとめ
この要約は機械生成です。

研究者らは,独特の中間ポリマーであるポリ・オキシリレン (PDOX) を用いて,ポリ・オキシリレン (POX) を合成する新しい方法を開発しました. この新しいアプローチは 高分子量POXと再構成可能な材料への道を開きます

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科学分野:

  • ポリマー化学
  • 有機合成
  • 材料科学

背景:

  • ポリオキシリレン (POX) の合成は,その構造のために困難です.
  • POX生産の伝統的な方法はしばしば非効率です.
  • POXには 潜在的に価値のある物理的性質があります

研究 の 目的:

  • 高分子量ポリオキシリレンのための新しい合成戦略を開発する.
  • 中間ポリマーの形成と性質を調査する.
  • ポリ・オキシリレンからポリ・オキシリレンへのイソメリゼーションを調査する.

主な方法:

  • デワロキシリレン (DOX) のストレートモノマーによるバレンスの同位体戦略を用いる.
  • フリーラジカルポリメリゼーションを用いて,ポリ・デワロ・オキシリレン (PDOX) を合成する.
  • PDOXからPOXへの熱と光誘導による異体化の研究.

主要な成果:

  • 高分子量ポリオキシリレン) がPDOXで成功して合成されました.
  • PDOXはデワールベンゼン単位の高密度で形成された.
  • PDOXからPOXへの熱および光誘導による効率的な変換が示されました.

結論:

  • 新しく開発されたバレンスの同位体戦略により,難解なポリ・オキシリレン・ポリマーの合成が可能になる.
  • 効率的なPOX生成を容易にする.
  • この方法は,調整可能な性質を持つ再構成可能な材料にアクセスできます.