単一成分分子金属における赤外線電子吸収
Akiko Kobayashi1, Masaaki Sasa, Wakako Suzuki
1Research Centre for Spectrochemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Journal of the American Chemical Society
|January 15, 2004
まとめ
Ni ((tmdt) 2) のような単一成分分子金属は,ユニークな低エネルギー電子吸収を示しています. これは,分子導体が非常に小さい,最も高い分子軌道-最も低い分子軌道空隙を持っていることを示唆しています.
科学分野:
- 材料科学 材料科学とは
- 固体物理 固体物理学
- 分子化学 分子化学
背景:
- この研究は,Ni ((tmdt) 2) に焦点を当てており,低温で安定した金属状態を示す新しい単一成分分子金属です.
- 拡張TTFリガンドは,ユニークな電子特性を有する分子材料の設計において極めて重要です.
研究 の 目的:
- 赤外線スペクトロスコピーを用いてNi (tmdt) 2の電子特性を調査する.
- 単一コンポーネント分子導体における分子構造と伝導性の関係を理解する.
主な方法:
- 赤外線 (IR) スペクトロスコピーは,Ni ((tmdt) 2) の結晶を分析するために使用されました.
- 金属から半導体まで,類似の分子のIRスペクトルの比較分析が行われました.
主要な成果:
- Ni (tmdt) 2. 2200 cm-1 辺りに非常に低エネルギーの電子吸収が観察されました.
- 吸収ピークのシステマティックなシフトは,関連する化合物の金属から半導体への移行と相関しています.
結論:
- Ni ((tmdt) 2) で例示される単成分分子導体には,異常に小さなHOMO-LUMOギャップが特徴です.
- 観測された電子吸収は,これらの高度な分子材料の基本的な電子構造についての洞察を提供します.
さらに関連する動画
07:55Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
06:53Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
関連する概念動画
02:26Photoelectric Effect
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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.
01:32UV–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...
01:14Molecular Spectroscopy: Absorption and Emission
Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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,...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...