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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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.
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Bridging the Bio-Electronic Interface with Biofabrication
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Bridging the Bio-Electronic Interface with Biofabrication

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動的にアドレッシブルなアミナルメタロゲルによる相変化変換

Peter J Boul1, Peter D Jarowski2, Carl J Thaemlitz1

  • 1Aramco Research Center , Houston, Texas 77061, United States.

Journal of the American Chemical Society
|October 10, 2017
PubMed
まとめ
この要約は機械生成です。

ダイナミックなポリマーは三価金属が結合すると液体になり,加熱するとゲルに再構成されます. この可逆的な変容は 先進的な材料に 自己修復とトリガーリリースの機能を提供します

さらに関連する動画

Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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科学分野:

  • ポリマー化学
  • 材料科学
  • 超分子化学

背景:

  • ダイナミックな共性化学は 適応性のある材料の作成を可能にします
  • ヘミアミナルとアミナル結合は,ダイナミックなポリマーにとって重要な可逆性結合を形成します.

研究 の 目的:

  • ヘミアミナルとアミナル機能を持つダイナミックなポリマーに対する三価金属の効果を調査する.
  • ポリマーゲルにおける均衡状態と非均衡状態の変換を調査する.
  • これらのダイナミックなシステムの自己治癒とトリガー放出特性を特徴づける.

主な方法:

  • ヘミアミナルとアミナル結合を用いたダイナミックポリマーの合成.
  • ゲル-ソル変換と材料の性質を研究するレオロギー分析
  • 核磁共振 (NMR) スペクトロスコーピーは,反応中間物質を検出する.
  • 密度関数理論 (DFT) の計算により,エネルギー景観を理解する.

主要な成果:

  • 三価金属はダイナミックなポリマーの可逆的な断片化を誘導し,ゲルから液体へと移行します.
  • 液相を加熱すると,閉環ヘキサヒドロトリアジン製品に触媒変換され,新しいゲルが形成されます.
  • システム熱力学と運動学により制御された凝縮時間は達成されました.
  • このシステムは 調節可能な特性,自己修復能力,トリガード・リリースの可能性を示した.

結論:

  • ヘミアミナル/アミナル機能に基づくダイナミックポリマーは,金属反応性,熱的に切り替え可能な振る舞いを示す.
  • 均衡状態と非均衡状態の相互作用により,制御された物質の変換が可能になります.
  • このシステムは,自己治癒とトリガードリリースの機能を持つ先進的な材料を開発するためのプラットフォームを提供します.