サイドオンおよびエンドオンCu2 (((S2) コアにおけるスペクトロスコーピと結合:ペロキシドアナログとの比較
Peng Chen1, Kiyoshi Fujisawa, Matthew E Helton
1Contribution from the Department of Chemistry, Stanford University, Stanford, California 94305, USA.
Journal of the American Chemical Society
|June 6, 2003
まとめ
この研究は,銅-二酸化硫化物結合がより強く,硫黄-硫黄結合が銅-二酸化硫化物複合体において,銅-過酸化物複合体と比較して弱いことを明らかにしています. これらの発見は,化学における金属と硫黄の相互作用を理解するために極めて重要です.
科学分野:
- 無機化学 無機化学とは
- バイオ・オーガニック化学 バイオ・オーガニック化学
- スペクトロスコーピーは,スペクトロスコーピーを用います.
- コンピューティング・ケミストリー
背景:
- 銅-二硫化物複合体は,構造的にも電子的にも銅-過酸化物複合体と類似しており,金属-リガンド結合に関する洞察を提供します.
- 金属-硫黄および金属-酸素結合の性質を理解することは,様々な化学的および生物学的プロセスにとって非常に重要です.
研究 の 目的:
- サイド・オン・エンド・オン・ブリッジ・コンプレックスにおける二硫化物リガンドとCu (II) イオン間の結合相互作用を調査する.
- これらの相互作用を,光譜的および計算的方法を使用して,類似の過酸化物複合体の相互作用と比較する.
- 金属-リガンドおよびリガンド-リガンド結合の相対的な強さを支配する電子的要因を解明する.
主な方法:
- 複合体の電子構造をモデル化するために,密度関数計算を用いた.
- 振動周波数と結合特性を探査するために,共振ラーマン光譜を用いた.
- UV-Vis吸収スペクトロスコピーは,電子トランジションに関する情報を提供しました.
主要な成果:
- ディスルファイド複合体は,過酸化同種と比較して,より弱いS-S結合とより強いCu-S結合を示す.
- サイド・オン・ブリッジ・コンプレックスは,強化されたシグマ・ドナー相互作用により,エンド・オン・ブリッジ・コンプレックスよりも,基底状態においてより大きな共振性を示します.
- サイドオン複合体ではリガンドシグマバックボンドが特定され,S-S/O-O結合を著しく弱めた.
結論:
- 銅二酸化硫化物複合体の電子構造と結合は,特に共電性度およびリガンド-リガンド結合強度において,それらの過酸化同位体と著しく異なる.
- サイドオン・コーディネーションは,シグマ・ドネーションとバック・ボンドの増加により,より強い金属-リガンド結合と,より弱いディスルファイド結合につながります.
- これらの発見は,触媒と生物学的活動に関連する金属硫黄システムの反応性と性質に関する根本的な洞察を提供します.
さらに関連する動画
04:09Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
Published on: August 30, 2024
09:22Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications
Published on: July 25, 2025
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...
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.
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for electronic transitions. As a result...
01:32UV–Vis Spectroscopy of Conjugated Systems
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...
One of the factors influencing λmax is the extent of conjugation in the...
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
01:29UV–Vis Spectroscopy: Woodward–Fieser Rules
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...