銅ディチオオキサミド複合体からなる高度指向の結晶表面調整ポリマーの構築
Katsuhiko Kanaizuka1, Rie Haruki, Osami Sakata
1Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka, Japan. kanaizuka@chem.kyushu-univ.jp
Journal of the American Chemical Society
|November 6, 2008
まとめ
研究者は,ルベアニク酸と銅イオンを使用して金属有機結晶を設計しました. この方法は,サファイアやガラスなどの表面で高プロトン伝導性を有する無形な固体を生成します.
科学分野:
- マテリアルサイエンス 材料科学
- クリスタル・エンジニアリング (Crystal Engineering) とは
- 固体化学 固体化学
背景:
- 金属有機結晶は,様々な用途にユニークな性質を備えています.
- 表面ベースの結晶工学は,制御された材料の製造を可能にします.
- 陽子伝導は,エネルギー貯蔵および変換装置において極めて重要です.
研究 の 目的:
- 結晶工学のための層対層のボトムアップアプローチを開発する.
- サファイアとガラスの表面での金属有機結晶の形成を調査する.
- 結果となる無形固体の陽子伝導特性を探求する.
主な方法:
- ルベアニク酸とその誘導体を有機成分として利用する.
- 銅のイオン (Cu2+) を無機成分として使用する.
- 溶液中の成分を混合して基板表面に無形な固体を形成する.
主要な成果:
- 有機および無機前駆物質の混合により,無形固体の即時の形成.
- サファイアとガラスの表面で層ごとに結晶工学を成功させました.
- 合成された無形金属有機固体における高プロトン伝導の観測.
結論:
- ボトムアップの結晶工学のアプローチは,機能的な材料を製造するのに有効です.
- 形状のない金属有機固体は,陽子伝導アプリケーションに有望な性質を示しています.
- 表面限定合成は,素材特性を調整するための多用途な経路を提供します.
関連する概念動画
02:58Crystal Field Theory - Octahedral Complexes
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
02:42Valence 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...
02:54Coordination Compounds and Nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
02:37Metallic 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...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:57Coordination 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.
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...