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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

10.0K
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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Nuclear Transmutation03:20

Nuclear Transmutation

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.6K
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...
2.6K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

41.1K
sp3d and sp3d 2 Hybridization
41.1K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

1.6K
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...
1.6K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

45.9K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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関連する実験動画

Updated: Nov 10, 2025

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

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ディプニクトゲン f-元素化学: 二酸化ウラン複合体

Jingzhen Du1, David Hunger2, John A Seed1

  • 1Department of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, U.K.

Journal of the American Chemical Society
|April 1, 2021
PubMed
まとめ

研究者は最初のウラン二酸化物複合体を合成し,f元素化学の突破口となった. この発見は,重元素のリン結合と反応性を理解するための新しい道を開きます.

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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

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関連する実験動画

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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

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科学分野:

  • 有機金属化学
  • 無機化学
  • F元素 化学

背景:

  • f元素の二酸化窒素複合体は知られているが,f元素の二酸化窒素複合体は未発見のままである.
  • 二酸化炭素 (P2) は二酸化窒素 (N2) のより重い同種であり,結合に特異的な課題がある.

研究 の 目的:

  • 合成し,最初のf元素二酸化炭素複合体を特徴づける.
  • ウラン二酸化物の相互作用の結合と電子構造を調査する.
  • 新しい二酸化炭素複合体の反応性を調べるためだ

主な方法:

  • フォスファディベンゾーノルボナーディエンの媒介によるP原子移転によるウラン (IV) 二酸化塩素複合体の合成.
  • 顕微鏡および結晶学的技術を用いた実験的特徴付け.
  • 電子構造と結合を明らかにする計算モデルです.

主要な成果:

  • ウランのサイド・オン・バインド・ディフォスファース複合体の成功合成 (IV).
  • 特徴づけにより,ディフォスファルリガンドはダイアニオン (P2) 2種として存在することが明らかになった.
  • 平面内のウラン-リン型π結合が優勢で,補足的な弱いδ対称性相互作用がある.

結論:

  • この研究は,最初のf元素二酸化炭素複合体を報告し,重いグループ15元素の既知の化学を拡張しました.
  • 活性化された (P2) 2 - リガンドと支配的なπ結合は,f-要素-リガンドの相互作用に関する新しい洞察を提供します.
  • 予備的な反応性研究は,反応性フォスフィド種を生成する可能性を示すウランサイクロ-P3複合体への変換を示しています.