関連する実験動画
Updated: Jul 20, 2026

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Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
Published on: April 27, 2017
アミノ基とエーテル基を持つ高酸化フッ素溶媒の協調性特性
Paul G Boswell1, Elizabeth C Lugert, József Rábai
1Department of Chemistry, University of Minnesota, Minneapolis, 55455, USA.
Journal of the American Chemical Society
|December 1, 2005
まとめ
perfluorinated アミンは最小限のイオン相互作用を示しますが, perfluorinated エーターは,ナトリウムとリチウムイオンに弱い結合を示します. これらの研究のために,新しいフッ素性電解質塩が開発されました.
科学分野:
- 協調化化学について
- フッ素化合物とは
- 電気化学 電気化学について
背景:
- アミノ基とエーテル基を持つ高化溶媒は広く使用されていますが,その協調性特性は十分に理解されていません.
- 電子を取り除く高化群は,一般に機能群を惰性化すると考えられているが,定量的なデータは欠けている.
研究 の 目的:
- 定量的に無機モノケーションと特定のフルオリン酸アミンおよびエーテル化合物の相互作用を評価する.
- perfluorinated 溶媒における機能群のルイス基質特性を調査する.
主な方法:
- 特定のボラート塩でドーピングされた液体膜カチオン選択電極を使用した.
- 密度関数理論の計算を用いて,高化アミンの構造を決定した.
- 低極性フッ素溶媒での実験のための新しいフッ素性電解質塩を開発し,特徴づけました.
主要な成果:
- perfluorinated amine (perfluorotripentylamine) は,テストされたイオンと測定可能な関連性を示せず,形式的なpK(a) <-0.5.5であった.
- perfluorinated tetraether (2H-perfluoro-5,8,11-trimethyl-3,6,9,12-tetraoxapentadecane) は,Na(+) (K(a) = 2.3 M−1) とLi(+) (K(a) = 1.5 M−1) との弱い相互作用を示した.
- 新しいフッ素性電解質塩が合成され,濃縮溶液でイオン性液体特性 (Tg = -18.5 °C) と高モール伝導性を示した.
結論:
- この研究では,アミンの低ルイス基本性と,高化化合物のエーターの弱いルイス基本性を定量化しています.
- 発見は,そのようなシステムにおけるルイス基質文字の完全な欠如に関する以前の仮定に異議を唱える.
- 開発された性電解質塩は,性媒体における電気化学的応用に有効です.
関連する概念動画
Halogens
Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group.
Leveling Effect and Non-Aqueous Acid-Base Solutions
This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
Acidity and Basicity of Alcohols and Phenols
Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.
Basicity of Heterocyclic Aromatic Amines
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
EDTA: Auxiliary Complexing Reagents
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
Leveling Effect
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...

