(dxz, dyz) 3 (dxy) 1 (dz2) 1の電子構成を持つ中間スピン鉄 (III) ポルフィリン複合体の形成
Takanori Sakai1, Yoshiki Ohgo, Takahisa Ikeue
1Department of Chemistry, School of Medicine, Toho University, Ota-ku, Tokyo 143-8540, Japan.
Journal of the American Chemical Society
|October 23, 2003
まとめ
輪状ポルフィリンを持つ鉄 (III) 複合体は,輪状ポルフィリンを持つ複合体とは異なる新しい電子構成を示す. メソ-13Cの化学的シフトに基づいたこの発見は,これらの協調化合物の異なる電子構造を明らかにします.
科学分野:
- 協調化化学について
- 無機化学 無機化学とは
- スペクトル顕微鏡検査です.
背景:
- 鉄 (III) ポルフィリンは,様々な生物学的および触媒的プロセスにおいて極めて重要です.
- ポルフィリンリガンドの電子構造は,金属複合体の性質に大きな影響を与えます.
- 電子構成を理解することは,反応性と機能を予測する鍵です.
研究 の 目的:
- 中間回転鉄の電子構成を調査するために (III) 複合体と高度にラッフルされ,高度にサドル化されたポルフィリン.
- ポルフィリンマクロサイクルの形状に基づいて電子構造を区別する.
- ポルフィリン幾何学の鉄への影響を明らかにするために,電子状態.
主な方法:
- 核磁共振 (NMR) スペクトロスコーピーを利用し,特にメソ-13C化学シフト分析を行いました.
- 鉄 (III) 複合体間のスペクトルデータを比較し,ラッフルとセール付きのポルフィリン・スキャフォルを特徴付けました.
- 電子の分布と構成を推論するために,化学的シフトの違いを解釈した.
主要な成果:
- 中間スピンの鉄 (III) 複合体に対する明確なメソ-13C化学的シフトが,ラッフル対サードルポルフィリンで観察されました.
- 高濃度ポルフィリンが従来の電子構成を有することを決定した: (dxy) 2 (dxz, dyz) 2 (dz2) 1.1.
- (dxz, dyz) 3(dxy) 1(dz2) 1という新しい電子構成を,中間のスピンを持つ鉄 (III) 複合体と,高度にラッフルされたポルフィリンで特定した.
結論:
- 中間スピン鉄 (III) 複合体には,ラッフル・ポルフィリンとサドル・ポルフィリンが含まれており,明らかに異なる電子構成を示す.
- ポルフィリンマクロサイクルの形状 (ラッフル対サドル) は,鉄 (III) センターの電子基底状態を決定する.
- この発見は,メタルポルフィリンにおける構造-性質関係に関する新しい洞察を提供します.
さらに関連する動画
06:53Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
04:51Synthesis of Triazole and Tetrazole-Functionalized Zr-Based Metal-Organic Frameworks Through Post-Synthetic Ligand Exchange
Published on: June 23, 2023
関連する概念動画
03:35Hybridization of Atomic Orbitals II
sp3d and sp3d 2 Hybridization
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.
02:42Valence 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.