関連する実験動画
Updated: Jul 13, 2026
11:00
Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
C3v対称性受容体は,高選択性および高リン酸相性を示す
Suzanne L Tobey1, Benjamin D Jones, Eric V Anslyn
1Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712, USA.
Journal of the American Chemical Society
|April 3, 2003
まとめ
三脚の金属受容体1と2は,水溶液中のリン酸の認識に高い選択性と親和性を示しています. これらのC3v対称性受容体は,Cu(II) 原子の周りに事前に組織され,中性pHでリン酸を効果的に結合します.
科学分野:
- 超分子化学 超分子化学
- 協調化化学について
- アナリティカル・ケミストリー (Analytical Chemistry) とは
背景:
- 三脚リガンドは,金属結合のための先行組織を提供する.
- 金属受容体は,特定のアニオン認識のために設計することができます.
- C3v対称性は,四面体互補性の設計原理である.
研究 の 目的:
- 新型三足の金属受容体1および2のリン酸結合能力を報告する.
- これらの受容体の選択性とアフィニティを,水中媒体におけるリン酸塩に対する選択性とアフィニティを調べる.
- 配列結合の相互作用をスペクトロスコピーおよび計算方法を用いて特徴づけること.
主な方法:
- C3v対称三足の金属受容体の合成.
- アニオン結合をモニタリングするためのUV / visタイトレーション.
- アソシエーションコンスタンツを定量化するために結合アルゴリズムの適用.
主要な成果:
- 受容体1と2は,リン酸塩に対する高い選択性と親和性を示しています.
- 酸塩結合は,中性pHの水中媒体で観察されました.
- リン酸塩結合の結合定数 (Ka) は,受容体1の2.5 x 10^4 M^-1と受容体2の1.5 x 10^4 M^-1と決定された.
結論:
- 設計された三足の金属受容体は,リン酸を効果的に認識し,結合します.
- Cu (II) センターの周りの事前組織化戦略は,受容体の性能を高めます.
- これらの発見は,選択性アニオンセンサーと受容体の開発に寄与する.
関連する概念動画
02:54Ions 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:
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:
03:38Polyprotic Acids
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
02:40Ligand Binding Sites
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
02:16Brønsted-Lowry Acids and Bases
In 1923, the Brønsted–Lowry definition of acids and bases was proposed by Johannes Brønsted and Thomas Lowry. According to this theory, a Brønsted acid is defined as a species that donates a proton in a chemical reaction and gets converted to its conjugate base. A Brønsted base is defined as a species that accepts a proton in a chemical reaction and gets converted into its conjugate acid. These transfers of protons are caused by the displacement of electrons in these reactions, which is...
01:13Relative Reactivity of Carboxylic Acid Derivatives
Carboxylic acid derivatives such as acid halides, anhydrides, esters, and amides undergo nucleophilic acyl substitution reactions with varying degrees of reactivity.
A key factor in assessing the reactivity of the acid derivatives is the basicity of the substituent or the leaving group. The lower the basicity of the leaving group, the higher the reactivity of the derivative. The basicity of the leaving group follows this order:
Halide ions < Acyloxy ions < Alkoxy ions < Amine ions
A key factor in assessing the reactivity of the acid derivatives is the basicity of the substituent or the leaving group. The lower the basicity of the leaving group, the higher the reactivity of the derivative. The basicity of the leaving group follows this order:
Halide ions < Acyloxy ions < Alkoxy ions < Amine ions
01:17Ion Exchange
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...