関連する実験動画
Updated: Jul 5, 2026
10:44
Preparation of Carbon Nanosheets at Room Temperature
Published on: March 8, 2016
ヘクサコーディネート炭素化合物の合成と構造
Torahiko Yamaguchi1, Yohsuke Yamamoto, Daisuke Kinoshita
1Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan.
Journal of the American Chemical Society
|May 8, 2008
まとめ
研究者らは,炭素化合物の6つの協調性と高価性を調査した. ステリック制約により,4つのエーテル酸素原子がアルネン炭素に近づき,二甲基化された二酸化物における六合座標炭素を確認した.
科学分野:
- 有機金属化学 有機金属化学
- コンピューティング・ケミストリー
- 構造化学についてです.
背景:
- 炭素化合物は,典型的には4座標結合を示す.
- 炭素の高価性は,オクテットルールを超えた場合,珍しい現象です.
- ステリック障害は分子幾何学と調整数に影響を与える.
研究 の 目的:
- 6座標炭素の実現の可能性を調査する.
- 炭素化合物のハイパーヴァレンスの概念を探求する.
- 異常な協調性を備えた新しい炭素複合体を合成し,特徴づけること.
主な方法:
- ステリック制約を用いて,複数のドナー原子を中央の炭素の周りに配置した.
- 結合特性を決定するために,実験的な電荷密度分析を使用した.
- 実験結果を裏付けるために,密度関数理論 (DFT) の計算を行った.
主要な成果:
- 4つのエーテル酸素原子をアレン性炭素に近接させることに成功した.
- ディメチル化ダイケーション2でヘクサコーディネート炭素中心の形成が確認されました.
- 充電密度分析とDFT計算は,異常な調整の有力な証拠を提供した.
結論:
- この研究は,従来の結合モデルに異議を唱え,六合座標炭素の有力な証拠を提供している.
- 合成されたダイケーションは,おそらく高価性であり,炭素の結合能力の既知の範囲を拡大します.
- この研究は,化学におけるハイパーコーディネートおよびハイパーバレント種の研究に新たな道を開く.
関連する概念動画
01:12Carbon Skeletons
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
02:23Structure of Alkanes
The formation of carbon-carbon bonds leading to the creation of the carbon chain is the basis of organic chemistry. August Kekulé and Archibald Scott Couper independently developed this idea of carbon chain formation.
Hydrocarbons are the simplest organic compounds composed of carbons and hydrogens. Based on the bond order between carbons, the hydrocarbons are further classified into alkanes, alkenes, and alkynes.
Alkanes are the simplest hydrocarbons with sp3 hybrid carbon atoms. These sp3...
Hydrocarbons are the simplest organic compounds composed of carbons and hydrogens. Based on the bond order between carbons, the hydrocarbons are further classified into alkanes, alkenes, and alkynes.
Alkanes are the simplest hydrocarbons with sp3 hybrid carbon atoms. These sp3...
02:02Chair Conformation of Cyclohexane
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
02:11Conformations of Cyclohexane
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
02:28Cycloalkanes
Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
The IUPAC nomenclature of cycloalkanes follows similar rules that apply to...
The IUPAC nomenclature of cycloalkanes follows similar rules that apply to...
01:18Structure of Benzene: Molecular Orbital Model
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).