関連する実験動画

Updated: Dec 15, 2025

Negative Additive Manufacturing of Complex Shaped Boron Carbides

Negative Additive Manufacturing of Complex Shaped Boron Carbides

Published on: September 18, 2018

超酸化カチオンのイコサヘドラルボロンクラスター

Julia M Stauber¹, Josef Schwan², Xinglong Zhang²

¹Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095, United States.

Journal of the American Chemical Society

|July 11, 2020

まとめ

ボロンケージの機能化により,新しい酸化還元化学が可能になる. 研究者らは,B₁₂(OR) ₁₂クラスタで第4の電子状態を発見し,デロカライズされたペアレス電子を持つ最初のオープンシェルのカチオンボロンクラスタを作成しました.

科学分野:

無機化学
電気化学
ボロンクラスター化学

背景:

親のイコサヘドラルクロソ-[B₁₂H₁₂]^2-クラスタには可逆的な電気化学的行動がない.
アルコキシまたはベンジロキシ (OR) グループによるパーファンクショナライゼーションは,可逆性還元化学を導入し,ダイアニオン,モノアニオン,中性状態を可能にします.

研究の目的:

電子が豊富なB₁₂(O-3-メチルブチル) ₁₂ (1) クラスタの電気化学的振る舞いを調査する.
既知のダイアニオン,モノアニオン,中性形を超えた新しい電子状態へのアクセスを探求する.

主な方法:

B₁₂(O-3-メチルブチル) ₁₂の電気化学的評価
化学的酸化により[N2,4-Br₂C₆H₃) ₃^•+を用いてカチオン種を生成する.
EPR,UV-vis,多核 NMR (¹H,¹¹B),およびXPSを用いた酸化クラスタの特徴化.

主要な成果:

ニュートラルクラスタの1電子酸化によって4番目の電子状態に至る新しい可逆性還元現象が発見されました.
一電子酸化クラスター [1]^•+は分離され,特徴づけられた.
これは,ボロン核を横断するペアリングされていない電子の異地化が提案されているオープンシェルカイオンボロンクラスタの最初の例です.
酸化プロセスは化学的に可逆であることが示された.

結論:

充実したボロンクラスターは豊かで調節可能な電気化学的性質を示します
オープンシェルのカチオンのB₁₂ (O-3-メチルブチル) ₁₂クラスタの発見は,ボロンケージで利用可能な既知の電子状態を拡張する.
この発見は,様々な分野におけるボロンクラスターの化学と応用の探索のための新しい道を開きます.

さらに関連する動画

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

Published on: January 6, 2016

関連する概念動画

Hydroboration-Oxidation of Alkenes

Hydroboration-Oxidation of Alkenes

In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.

Exceptions to the Octet Rule

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:

Radicals: Electronic Structure and Geometry

Radicals: Electronic Structure and Geometry

This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...

Hybridization of Atomic Orbitals I

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...

Lattice Centering and Coordination Number

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...

Valence Bond Theory

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...