Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Acids, Bases and Neutralization Reactions03:26

Acids, Bases and Neutralization Reactions

An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
Ions as Acids and Bases02:54

Ions as Acids and Bases

Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
Qualitative Analysis03:46

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
Acids, Bases and Neutralization Reactions01:27

Acids, Bases and Neutralization Reactions

Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
Phosphate Buffer01:22

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Mechanism-Guided, Data-Driven Discovery of a Dinuclear Gold Catalyst for Promoting Oxidative Addition.

Angewandte Chemie (International ed. in English)·2026
Same author

SITH: A quantum-chemical framework for predicting bond destabilization in stretched molecules.

The Journal of chemical physics·2026
Same author

An efficient and exact reformulation of fourth-order algebraic diagrammatic construction schemes.

The Journal of chemical physics·2026
Same author

Molecular Mechanism of the Oxidative Cleavage of Alkenes by Photoexcited Nitroarenes.

Journal of the American Chemical Society·2026
Same author

RE-ADC: The algebraic diagrammatic construction scheme for the polarization propagator using the retaining-the-excitation-degree partitioning.

The Journal of chemical physics·2026
Same author

Mixed-order schemes for molecular properties employing ADC/ISR.

The Journal of chemical physics·2026

関連する実験動画

Updated: Jul 12, 2026

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
09:49

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability

Published on: April 2, 2015

ディアニオン系テトラボラートは,安定した実体として存在する.

Andreas Dreuw1, Norbert Zint, Lorenz S Cederbaum

  • 1Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, CA 94720-1470, USA. andreas@bastille.cchem.berkeley.edu

Journal of the American Chemical Society
|September 5, 2002
PubMed
まとめ
この要約は機械生成です。

安定したダイアニオン系テトラボラート,例えばB(4)(CN)(4)(2-) とB(4)(BO)(4)(2-) は,ガス相で特定されています. これらの新しいクローソボラート構造は電子的に安定しており,実験的に観測可能であると予測されています.

さらに関連する動画

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
09:04

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Published on: September 14, 2016

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
12:06

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

関連する実験動画

Last Updated: Jul 12, 2026

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
09:49

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability

Published on: April 2, 2015

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
09:04

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Published on: September 14, 2016

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
12:06

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

科学分野:

  • 無機化学 無機化学とは
  • コンピューティング・ケミストリー
  • 量子化学とは,量子化学である.

背景:

  • クロソボレートは,独特のケージ構造を持つ無機化合物のクラスです.
  • B ((6) H ((6) ((2-) は,凝縮相における最も小さな既知の安定したクローソボラートである.
  • 安定したダイアニオン系テトラボラートは以前には観察されなかった.

研究 の 目的:

  • ダイアニオン系テトラボラートB(4)X(4)(2-) (X = H,CN,NC,またはBO) のガス相安定性を調査する.
  • 安定したイソマーを特定し,それらの電子特性を理解するために.

主な方法:

  • アブイニシオ 電子構造計算.
  • ダイアニオン構造の幾何学的な最適化.
  • 電子安定性と断片化チャネルの分析.

主要な成果:

  • Bの四面体イソマーは幾何学的に安定しているが,電子的に不安定である.
  • 閉じた殻のシングレット基底状態を持つ新しいD(2)(d) -対称性イソマーが特定されました.
  • 安定したガス相ダイアニオンであることが判明した.
  • 安定性は,電子対電子の排斥と芳香性に起因する.

結論:

  • 新型で安定したダイアニオン系テトラボラートB ((4) (((CN) ((4) ((2-)) とB ((4) ((BO) ((4) ((2-)) がガス相に存在しています.
  • これらの発見は,ダイアニオン酸ボラートの安定性に関する以前の仮定に異議を唱える.
  • 特定されたD(2)(d) -対称性イソマーは,実験的観測のための有望な候補である.