水素結合混合バレンスの複合体における間隔電荷伝送帯の観測について
Gabriele Canzi1, John C Goeltz, Jane S Henderson
1Department of Chemistry and Biochemistry, University of California San Diego , 9500 Gilman Dr. MC 0358, La Jolla, California 92093-0358, United States.
Journal of the American Chemical Society
|January 21, 2014
まとめ
ルテニウムクラスターは,電子還元後,水素結合を通じて安定した混合バレンスの二次体を形成する. スペクトロスクーピーのデータでは,電子結合と電荷移転が明らかになり,このシステムはロビン・デイクラスIIに分類されています.
科学分野:
- 無機化学 無機化学とは
- マテリアルサイエンス 材料科学
- 電気化学 電気化学について
背景:
- ルテニウムクラスターは,多用途の協調化合物です.
- 混合バレンスの化合物は興味深い電子特性を示しています.
- 水素結合は,超分子化学において重要な役割を果たします.
研究 の 目的:
- 新しいルテニウムクラスタを合成し,特徴づけること.
- 水素結合混合バレンスのジメールの形成と性質を調査する.
- これらの二次元における電子結合と電荷伝送機構を理解する.
主な方法:
- 特定のリガンド (dmap,イソニコチン酸) によるルテニウムクラスターの合成.
- 還元可能性と安定性を研究するための電気化学分析.
- 電子スペクトル検査 (UV-Vis-NIR) で,電荷伝送帯を特定する.
- 赤外線スペクトロスコーピーは,電子の移位と移転ダイナミクスを探査します.
主要な成果:
- 単一電子還元により,安定した,水素結合混合バレンスのルテニウムジメルの形成.
- 電気化学データは,水素結合の横断で有意な電子結合を示しています.
- NIR領域で観測された2つの間隔電荷伝送帯は,ロビン・デイクラスIIシステムの特徴です.
- 顕微鏡の証拠は,電子の移転が10^10s^-1.0よりも遅い局所的な電子行動を示唆しています.
結論:
- 研究されたルテニウムクラスターは,水素結合によって安定した堅固な混合バレンスのダイマーを形成する.
- 電子構造と電荷伝送特性は,ロビン・デイのクラスIIモデルと一致しています.
- この発見は,橋渡しされた多核金属複合体における電子伝送ダイナミクスに関する洞察を提供します.
関連する概念動画
Valence Bond Theory
8.9K
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...
8.9K
Valence Bond Theory
38.9K
Overview of Valence Bond Theory
38.9K
IR Spectrum Peak Broadening: Hydrogen Bonding
1.9K
The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
1.9K
Hydrogen Bonds
11.9K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
11.9K
Hydrogen Bonds
109.5K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
109.5K
Crystal Field Theory - Octahedral Complexes
28.4K
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...
28.4K


