スピン・クロスオーバー・アイアン ((II) 光特性を持つコーディネーションポリマー:放射特性とスピン状態の相関
Charles Lochenie1, Konstantin Schötz2, Fabian Panzer2
1Inorganic Chemistry II, Universität Bayreuth , Universitätsstrasse 30, NW I, 95440 Bayreuth, Germany.
Journal of the American Chemical Society
|December 19, 2017
まとめ
この研究では,室温以上の広範囲の熱ヒステレスループを持つ新しいスピンクロスオーバー調整ポリマーを提示しています. この素材は
科学分野:
- 協調化学
- 材料科学
- 超分子化学
背景:
- スピン・クロスオーバー (SCO) 材料は,分子スイッチとメモリデバイスにとって有望である.
- 幅広い熱ヒステリシスを持つSCO材料の設計は,実用的なアプリケーションに不可欠です.
- コーディネーションポリマーはSCO現象の調整可能な構造を提供します.
研究 の 目的:
- 新しいスピン・クロスオーバー・コーディネーション・ポリマーの合成と特徴づけ
- 材料の熱ヒステレスと構造特性を調査する.
- SCO検出のための発光の可能性を探求する.
主な方法:
- [Fe (L1) (bipy) ]nコーディネーションポリマーの合成
- 磁気測定,モースバウアー光譜,およびスピン移行の特徴化のためのDSC.
- 構造分析のための温度依存のX線粉砕.
主要な成果:
- 調整ポリマーは室温以上で48K幅の熱ヒステリシスループを示し,いくつかのサイクルで安定しています.
- 構造的なフェーズ移行は,スピン移行と結合されます.
- 発光特性は,スピン移行で緑から黄色に変化し,光学追跡が可能になります.
結論:
- 合成されたコーディネーションポリマーは,ビスタブルな応用の可能性のある堅固なスピン・クロスオーバー行動を示しています.
- 統合された構造とスピン移行は,SCOメカニズムへの洞察を提供します.
- 発光ベースの検出は,スピン移行を監視するための非侵襲的な方法を提供します.
さらに関連する動画
06:53Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
2.7K
07:11ARL Spectral Fitting as an Application to Augment Spectral Data via Franck-Condon Lineshape Analysis and Color Analysis
Published on: August 19, 2021
3.0K
関連する概念動画
03:02Colors and Magnetism
14.2K
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...
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...
14.2K
01:26Variables Affecting Phosphorescence and Fluorescence
1.5K
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
1.5K
02:42Valence Bond Theory
11.4K
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...
11.4K
01:23Photoluminescence: Fluorescence and Phosphorescence
4.0K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
4.0K
02:52Stereoisomerism
14.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
14.1K
02:58Properties of Transition Metals
30.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
30.1K