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関連する概念動画

Periodic Classification of the Elements04:00

Periodic Classification of the Elements

The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Structure of Benzene: Molecular Orbital Model01:18

Structure 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).
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...

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Updated: Jul 13, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

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

Published on: March 24, 2018

密集したC ((70) ((3-) 段階 - 合成,構造,電子特性

Mark S Denning1, Ian D Watts, Sandra M Moussa

  • 1Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, UK.

Journal of the American Chemical Society
|May 9, 2002
PubMed
まとめ

研究者らは,C(70) フラーレンから面中心の立方体 (fcc) 三価フラーリドアニオン塩を合成した. これらの金属的,しかし超伝導的でない相は,フルレンの超伝導性についての洞察を提供します.

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Preparation and Characterization of C60/Graphene Hybrid Nanostructures

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Last Updated: Jul 13, 2026

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06:44

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Published on: March 24, 2018

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科学分野:

  • 固体化学 固体化学
  • 材料科学 材料科学とは
  • 超伝導性に関する研究

背景:

  • C(60) ((3) ((-) アニオンの電子変異は,フルレリドの超伝導性過渡温度が高いことと関連している.
  • C(70) のような高級フルレレンから三価フルレリドアニオン塩を合成することは,実験的に困難でした.
  • C(70) の既存の安定段階には,A(1) C(70),A(4) C(70),およびA(6) C(70) が含まれています.

研究 の 目的:

  • フルレン対称性と超伝導性を結びつける仮説を実験的に評価する.
  • 顔中心の立方体 (fcc) 三価フラーリドアニオン塩 (A(3) C(70) をC(70) フラーレンから合成する.
  • これらの新しいフルライド相の構造的および電子的性質を調査する.

主な方法:

  • fcc A(3) C(70) フェーズを合成し,特に四面体サイトでナトリウムカチオンを使用して安定させます.
  • 構造的特徴付け,メタステーブルフェーズに影響を与える冷却プロトコルに注意を払う.
  • 電子パラマグネティック共振 (EPR) スペクトロスコーピーは,電子特性を探査します.

主要な成果:

  • fcc A(3) C(70) フェーズを合成し,ナトリウムカチオンサイズマッチングで安定させた.
  • 冷却プロトコルに対する構造的依存が観察され,相が乱れている.
  • EPRのデータは金属的振る舞いを示したが,5K以上の超伝導性は示されなかった.
  • フェルミレベルでの状態の低密度は,超伝導性の条件が不十分であることを示唆しています.

結論:

  • 合成されたfcc A(3) C(70) 段階は金属であるが,超伝導的ではない.
  • C70) システムにおける超伝導性は,おそらくより高い電子ドーピング (C70) アニオンあたり4電子) を要求する.
  • 安定したA(3) C(70) を達成するには,八面体と四面体の両方の位置で正確なサイズマッチングが必要です.