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Formation of Complex Ions03:45

Formation of Complex Ions

24.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Properties of Organometallic Compounds01:23

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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.
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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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電気触媒型イソクサゾリンナノ炭素金属複合体

Shao-Xiong Lennon Luo1, Richard Y Liu1, Sungsik Lee2

  • 1Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|July 2, 2021
PubMed
まとめ

イソクサゾリン群で機能化された新しい炭素ナノマテリアルは,移行金属を効果的にケラートします. これらの新しい金属-炭素ケラートは,酸素進化反応における異質な触媒の効率的な電子結合を示しています.

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • カタリシス

背景:

  • 効率的な異質な触媒の開発は,エネルギー変換技術にとって極めて重要です.
  • 炭素ナノマテリアルは,触媒のサポートのためにユニークな電子的および構造的特性を提供します.
  • 金属の触媒と支柱の間の強力な電子結合が達成されれば,活動が強化されます.

研究 の 目的:

  • 炭素ナノマテリアルベースの金属ケラートを合成する.
  • 酸素進化反応における異質な触媒としての効果を調査する.
  • これらの材料の構造-活性関係を理解する.

主な方法:

  • マルチウォールカーボンナノチューブ (MWCNT) と数層グラフェン (FLG) の共性機能化は,マイクロ波補助サイクロアディションを使用する.
  • ラマン光譜法,X線光電子光譜法 (XPS),飛行時間二次イオン質量スペクトロメトリ (ToF-SIMS) を使用した特徴付け.
  • 金属のケレーションは,Ir (III),Pt (II),Ru (III),Ni (II) で行われ,X線吸収スペクトロスコーピー (XAS) とSTEM-EDS元素マッピングによる特徴づけが行われる.

主要な成果:

  • 高密度イソクサゾリンの機能群はMWCNTとFLGにうまく結合した.
  • ケラート金属含有量は,分子分散型触媒で3.0%まで達した.
  • 金属と炭素のサポートの間の有効な電子結合が実証されています.
  • 酸素進化反応で低過剰電位と調節可能な活性を達成した.

結論:

  • 構造的に正確な異質分子触媒はグラフェン表面で形成された.
  • イソクサゾリンのリガンドは,強力な電子結合を促進し,触媒性能を向上させます.
  • これらの金属ケラートされた炭素ナノマテリアルは,電気触媒の応用,特に酸素の進化に大きな希望を示しています.