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関連する概念動画

Formation of Complex Ions03:45

Formation of Complex Ions

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...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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...
Structural Isomerism02:34

Structural Isomerism

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 be...
Amino acids03:42

Amino acids

Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...
Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...

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関連する実験動画

Updated: Jun 25, 2026

Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique
06:47

Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique

Published on: September 20, 2011

ニトロフェノラートは,ランタナイド鎖,層,群の構成要素として用いられる.

Markus R Bürgstein1, Michael T Gamer, Peter W Roesky

  • 1Forschungszentrum Karlsruhe GmbH, Institut für Technische Chemie, Chemisch-Physikalische Verfahren (ITC-CPV), Postfach 3640, 76021 Karlsruhe, Germany.

Journal of the American Chemical Society
|April 22, 2004
PubMed
まとめ

この研究では,無限鎖,テトラデカヌクレアクラスター,無限層を含む新しいランタニド複合体を,ランタニドトリクロライドとO-ニトロフェノラートカリウムを反応させ,合成した. 構造的多様性はランタニドの大きさと反応条件に依存し,ユニークな包装とチャネル形成を明らかにした.

科学分野:

  • 協調化化学について
  • 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:

  • ランタニド複合体は,多様な構造と性質を示します.
  • オニトロフェノ酸カリウムは,金属の協調のための多用途のリガンドです.

研究 の 目的:

  • カリウムO-ニトロフェノラートを使用して,新しいランタニド複合体を合成し,特徴づけます.
  • ランタニドイオン半径と反応条件が,その結果生じる構造に及ぼす影響を調査する.
  • 無限のチェーン,クラスター,層を含む構造的多様性を探求する.

主な方法:

  • オニトロフェノ酸カリウムと様々なランタニド三塩化物との反応.
  • 制御された大気下での結晶化 (空気または空気中の除外).
  • 構造的決定のための単結晶X線 difraktion.

主要な成果:

  • [(THF) 4[[K(o-O2N-C6H4-O) 4Ln]4]nの無限鎖は,無酸素条件下でより小さなランタニド (Y, Er, Lu) と形成されました.
  • テトラデカヌクレアクラスターH18[Ln14(micro-eta2-o-O2N-C6H4-O) 8 ((eta2-o-O2N-C6H4-O) 16 ((micro4-O) 2 ((micro3-O) 16) はエアロビック条件で得られたものです.

さらに関連する動画

A Facile and Eco-friendly Route to Fabricate Poly(Lactic Acid) Scaffolds with Graded Pore Size
13:46

A Facile and Eco-friendly Route to Fabricate Poly(Lactic Acid) Scaffolds with Graded Pore Size

Published on: October 17, 2016

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
10:34

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer

Published on: April 23, 2017

関連する実験動画

Last Updated: Jun 25, 2026

Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique
06:47

Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique

Published on: September 20, 2011

A Facile and Eco-friendly Route to Fabricate Poly(Lactic Acid) Scaffolds with Graded Pore Size
13:46

A Facile and Eco-friendly Route to Fabricate Poly(Lactic Acid) Scaffolds with Graded Pore Size

Published on: October 17, 2016

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
10:34

Ligand Nano-cluster Arrays in a Supported Lipid Bilayer

Published on: April 23, 2017

  • 無限層の[[K2(o-O2N-C6H4-O) 5Tb]nと[[K2(o-O2N-C6H4-O) 5Ln) ]nは,無酸素状態でより大きなランタニド (Sm, Eu, Tb) と合成されました.
  • 層の詰め込みとチャネル形成の構造的差異は,ランタニドのサイズと調整に基づいて観察されました.

    • 結論:

    • カリウムオニトロフェノラートとランタニドトリクロライドの反応により,多様な超分子構造が生じる.
    • ランタニドイオン半径と反応大気は,鎖,クラスター,または層の形成を制御する重要な要因です.
    • この研究は,新しい材料の設計のためのランタナイド調整化学の調整性を強調しています.