Ce@C82とそのアニオンの特性
Takatsugu Wakahara1, Jun-ichi Kobayashi, Michio Yamada
1Center for Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
Journal of the American Chemical Society
|April 15, 2004
まとめ
研究者らはHPLCを用いてセリウムフルレーン (Ce@C82) を分離し,そのアニオンを分析した.
科学分野:
- 超分子化学 超分子化学
- 有機金属化学 有機金属化学
- ナノテクノロジー ナノテクノロジー
背景:
- フラーレンは,ユニークな電子特性を有する炭素ケージ分子です.
- エンドオヘドラルフルレンは,炭素内の原子をカプセル化し,それらの特性を変更します.
- セリウムのエンドヘッダルフルレンは,セリウムのf電子の振る舞いにより興味を惹きます.
研究 の 目的:
- セリウムエンドヘドラルフルレン (Ce@C82) を分離し,特徴づけました.
- Ce@C82とそのアニオンの電子構造と安定性を調査する.
- これらのシステムを特徴づける際に,NMRとESRスペクトロスコピーの関係を探求する.
主な方法:
- 高性能液体クロマトグラフィー (HPLC) による隔離.
- (13) 構造的および電子的分析のための炭素核磁気共振 ((13) C NMR) スペクトロスコピー.
- 電子回転共振 (ESR) スペクトロスコピーは,磁気特性を探査する.
主要な成果:
- Ce@C82は成功裏に分離され,そのケージ対称性はC(2)(v) として決定されました.
- (13) [Ce@C82](-) アニオンのC NMRスペクトルは,セリウムf電子に起因する温度依存のシフトを示した.
- Ce@C82と[Ce@C82](-) は,アニソトロピックなg-マトリックスと急速なリラックスにより,ESRが静かであった.
- [Ce@C82](-) は,La@C82](-と比較して,より低い空気安定性を示しました.
結論:
- この研究は,NMRスペクトロスコピーによるCe@C82の電子構造の洞察を提供します.
- Ce@C82とそのアニオンのESR静寂は,特定の電子および磁気特性によって説明されます.
- 比較的な安定性は,エンドヘドラルな金属とフルレンの相互作用の違いを強調しています.
関連する概念動画
Electron Behavior
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.Electrons Orbit the NucleusElectrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus...
Electron Configuration of Multielectron Atoms
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
Lewis Symbols and the Octet Rule
Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis developed a model called the Lewis model that simplified the depiction of chemical bond formation and provided straightforward explanations for the chemical bonds seen in most common compounds.
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.
Predicting Molecular Geometry
VSEPR Theory for Determination of Electron Pair Geometries
Electron Behavior
Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...


