関連する実験動画
Updated: Aug 3, 2026
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
高スピンのd4複合体の電子および分子構造:トゥットン塩の[Cr(D2O) [6]2+カチオンの実験的および理論的研究
Christopher Dobe1, Christopher Noble, Graham Carver
1Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3000, Bern 9, Switzerland.
Journal of the American Chemical Society
|December 17, 2004
まとめ
変化する温度の研究は,クロームのダイナミックな変化を明らかにします.
科学分野:
- 無機化学 無機化学とは
- 固体物理 固体物理学
- 量子化学とは,量子化学である.
背景:
- Chromium (クロム) の塩, (MI) 2Cr (X2O) 6 (SO4) 2は,高スピンのd4複合体を理解するために研究されています.
- 以前の研究では,このようなシステムの詳細な可変温度電子構造データがなかった.
研究 の 目的:
- クロミウムの基底状態の電子構造を厳密に定義する (II) 広範囲の温度帯のチュートンの塩.
- これらの複合体における温度に依存するステレオ化学的および電子的変化を調査する.
- 温度変数EPRスペクトルの計算のための新しい理論的アプローチを開発する.
主な方法:
- 温度変数不弾性中性子散射 (INS) と多周波数電子パラマグネティック共振 (EPR) のスペクトロスコーピー.
- クリスタログラフィー研究.
- スピン・ハミルトニアンとヤーン・テラー・ハミルトニアンを用いたモデリング.
主要な成果:
- 温度による軸およびロムビックゼロフィールド分割パラメータの劇的な変化.
- [Cr(D2O) [6]2+複合体における温度に依存するステレオ化学的変化,Cr-O結合長が150K以上で結合する.
- 温度依存性アニソトロピック菌株モデルと新しいEPRスペクトル計算方法を用いた成功解釈.
結論:
- クロミウムの電子構造とステレオ化学 (II) トットンの塩は,温度に依存している.
- 温度に依存するアニゾトロプ菌株は,観測された現象を説明するために重要である.
- 開発された理論的アプローチは,INSとEPR技術の異なる時間スケールについての洞察を提供します.
関連する概念動画
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
02:42Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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...
02:58Crystal 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...
02:46Crystal 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,...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.