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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
Valence Bond Theory02:42

Valence Bond Theory

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...
Resonance02:52

Resonance

The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.

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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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バナジウムの構造的に特徴づけられた酸化窒素複合体.

Nicholas A Piro1, Michael F Lichterman, W Hill Harman

  • 1Department of Chemistry, University of California, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|February 4, 2011
PubMed
まとめ
この要約は機械生成です。

研究者は,新しいバナジウム-ピロリド複合体を用いて,強力な温室効果ガスである酸化窒素 (N2O) を活性化しました. この画期的な発見により,室温でN2Oが逆向き結合し,緑色酸化剤として利用できるようになった.

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科学分野:

  • 無機化学 無機化学とは
  • 有機金属化学 有機金属化学
  • グリーン・ケミストリー (Green Chemistry)

背景:

  • 酸化窒素 (N2O) は強力な温室効果ガスであり,環境に優しい酸化物質としての大きな可能性を持っています.
  • N2Oの高い運動安定性と劣ったリガンド特性により,金属センターによる活性化と利用が歴史的に制限されてきた.
  • よく特徴づけられた金属-N2O複合体は稀であり,N2Oベースの触媒プロセスの発展を妨げています.

研究 の 目的:

  • 酸化窒素 (N2O) を活性化し,反転的に結合できる新しい金属複合体を開発する.
  • 結果となる金属-N2O複合体の構造と結合を特徴付けるために.
  • N2Oを緑色酸化剤として利用するためのこのシステムの可能性を調査する.

主な方法:

  • バナジウム-ピロリド複合体の合成.
  • 室温での酸化窒素 (N2O) の可逆結合に関する研究.
  • 構造的決定のための単結晶X線 difraktion.
  • 振動スペクトロスコーピー (例えば,IR,Raman) を用いて特徴を決定する.
  • 構造的割り当てと結合分析をサポートするための密度関数理論 (DFT) 計算.

主要な成果:

  • 室温でN2Oを反転的に結合できるヴァナジウム-ピロリド系が成功して合成されました.
  • このタイプの金属-N2O複合体の最初の単結晶X線構造が得られた.
  • 振動スペクトロスコーピーとDFT計算を含む特徴化データは,線形,N結合金属-N2O複合体の割り当てを強く支持しています.

結論:

  • 開発されたバナジウム-ピロリド複合体は,酸化窒素の活性化における重要な進歩を表しています.
  • このシステムは,N2Oリガンド特性に関する以前の制限を克服し,室温で可逆結合を可能にします.
  • この発見は,熱力学的に強力で環境的にグリーンな酸化剤としてのN2Oの未充分利用の可能性について新しい道を開く.