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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

877
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...
877
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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Complementary DNA

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Overview
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Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Updated: Nov 20, 2025

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
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分子的によく定義された多価DNAによる電子同価性

Ho Fung Cheng1, Shunzhi Wang1, Chad A Mirkin1

  • 1Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.

Journal of the American Chemical Society
|January 22, 2021
PubMed
まとめ
この要約は機械生成です。

研究者らは,分子的に正確な電子同等体 (EEs) とナノ粒子ビルディングブロックを使用して,新しいコロイド結晶を作成しました. この画期的な発見により 結晶構造と熱的安定性を制御し プログラム可能な物質の分野を発展させました

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Electroeluting DNA Fragments
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Electroeluting DNA Fragments
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Electroeluting DNA Fragments

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科学分野:

  • コロイドとインタフェース科学
  • 材料科学
  • ナノテクノロジー

背景:

  • オリゴヌクレオチド機能化されたナノ粒子 (NP) は,プログラム可能な原子等価物 (PAE) と呼ばれ,コロイド結晶の構成要素である.
  • PAEは電子同等体 (EEs) として作用し,補完的な亜網を安定させることができますが,NPの多分散性はEE制御を制限します.
  • EE-PAEの相互作用とコロイド金属性の理解は,NPのDNA移植の変動のために困難です.

研究 の 目的:

  • 分子的に精密なEEsでコロイド結晶を合成するための戦略を開発する.
  • 分子EEsとNPベースのPAEによって形成された結晶の組み立てと性質を調査する.
  • 段階形成と結晶特性のEEの影響を調査する.

主な方法:

  • 精確な数のDNA鎖を持つ小さな分子によってテンプレートされた合成EEs.
  • 組み合わせた分子EEとNPベースのPAE.
  • X線散射と電子顕微鏡を用いて,その結晶を特徴づけた.

主要な成果:

  • 分子EEsとNPPAEsの組み立て時に3つの異なる"金属"フェーズを形成する.
  • 熱安定性は,EEあたりの粘着端の数に依存することを証明した.
  • 格子対称性は,PAEのEE粘着端の数と方向によって制御されていることが示されました.

結論:

  • NPベースのEEsの限界を克服する方法として分子的に正確なEEsを導入した.
  • 分子EEsは,従来の電子とは異なり,定義された有価性を有することを確立した.
  • コロイド結晶の特定の相形成を誘導し,影響するためにEEバレンスを使用できることを示した.