独特的形状的双层buckyferrocenes - 独特的电子捐赠者-接受者相互作用
Renata Marczak1, Mateusz Wielopolski, S Shankara Gayathri
1Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany.
Journal of the American Chemical Society
|November 14, 2008
概括
新型双层buckyferrocenes表现出显著的地面状态相互作用和电荷再分配. 激发状态失活主要形成激进离子对状态,对于理解它们的光物理性质至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 摄影化学的使用.
- 量子化学 是一个量子化学.
背景情况:
- 双层buckyferrocenes是具有密切的富勒/铁接触的新型分子架构.
- 了解电子捐赠者-接受者相互作用是它们光物理性质的关键.
研究的目的:
- 为了研究双层buckyferrocenes的C(2v) 和D(5d) 异构体中的基态和激发状态相互作用.
- 阐明激发状态失活和电荷转移的机制.
主要方法:
- 量子化学计算 量子化学计算
- 稳态吸收和光谱学.
- 时间分辨率光和femtosecond探头实验.
主要成果:
- 在铁素捐赠者和烯接受者之间观察到可观的基态电荷再分配.
- 在C(2v) 异构体中识别的间隔电荷转移过渡.
- 在buckyferrocenes中光火表明激素离子对状态的快速形成 (寿命12-39 ps).
结论:
- 双层buckyferrocenes显示显著的分子内相互作用,影响它们的电子特性.
- 激进的离子对状态形成是占主导地位的兴奋状态失活路径.
- 这些发现为复杂分子系统中的电荷转移动态提供了关键的见解.
相关概念视频
04:01VSEPR Theory and the Effect of Lone Pairs
Effect of Lone Pairs of Electrons on Molecule Geometry
01:18Aromatic Hydrocarbon Cations: Structural Overview
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Removing one hydrogen from the intervening CH2 group with both...
01:29Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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...
01:19Complexation Equilibria: The Chelate Effect
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...