キラルな鉄磁性金属有機クォーツのようなフレームワークにおける高プロトン伝導
Emilio Pardo1, Cyrille Train, Geoffrey Gontard
1Institut Parisien de Chimie Moléculaire, Université Pierre et Marie Curie-Paris 6 , UMR CNRS 7201, 75252 Paris cedex 05, France.
Journal of the American Chemical Society
|September 15, 2011
まとめ
研究者らは,新しい金属有機基板材料を開発した. このキラル素材は,室温で鉄磁気特性と高い陽子伝導性を両方示しています.
科学分野:
- 材料科学 材料科学とは
- クリスタログラフィーです.
- 固体化学 固体化学
背景:
- メタル・オーガニック・フレームワーク (MOF) は,調節性特性を有する多用途な材料です.
- 多機能MOFは,電子機器やエネルギー貯蔵のアプリケーションに求められています.
- チラルMOFは,非対称な触媒と分離のためのユニークな性質を提供します.
研究 の 目的:
- 複合リガンドとしての戦略を用いて新しい多機能分子材料を合成する.
- 結果となる材料の構造的,磁性,陽子伝導性の性質を調査する.
- この材料の先進技術における潜在的応用を探求する.
主な方法:
- 単結晶X線 difraktionを用いて結晶構造を決定した.
- マグネティック・オーダーリングを研究するために,磁気感受性の測定を行いました.
- プロトンの伝導性は,電気化学阻抗スペクトロスコーピーを用いて測定されました.
主要な成果:
- チラルの3次元クォーツのような金属有機構造体 (NH4) 4[MnCr2(ox) 6·4H2Oが成功して合成されました.
- この材料は,3.0K未満のフェロマグネティック・オーダリングを示しています.
- 室温で1.1 × 10−3 S cm−1の高い陽子伝導性が観察され,機能化されたチャネル内のゲスト分子に起因する.
結論:
- 合成されたMOFは多機能材料で,磁気装置や陽子伝導電解質の潜在的応用がある.
- コンプレックス・アズ・リガンド戦略は,高度な分子材料の作成に有効です.
- フレームワーク構造とゲスト分子の相互作用が材料の性質を決定する.
さらに関連する動画
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
08:25Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks (MOFs)
Published on: January 17, 2020
関連する概念動画
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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...
01:17Theory of Metallic Conduction
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
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.
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...