溶液中の多機能分子非核ランタニドクラスターにおけるYb-to-Eu協同感受性アップコンバージョン
Sai P K Panguluri1, Elsa Jourdain2, Papri Chakraborty3
1Institute of Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology, Kaiserstraße 12, Karlsruhe 76311, Germany.
Journal of the American Chemical Society
|May 3, 2024
まとめ
この研究では,効率的なアップコンバーションの光と単分子磁石の作用を示す新しいランタニド群が報告されています. この二重機能は 先進的な分子装置の扉を開きます
科学分野:
- 協調化学
- 材料科学
- フォト物理学
背景:
- ランタニド金属のクラスターは 分子と物質の化学を結びつけます
- アップコンバージョン (UC) 発光と単分子磁気 (SMM) は,高度な材料の重要な特性です.
研究 の 目的:
- 協同感受性UC特性を有する異核ランタニド群を合成し,特徴づけること.
- [Eu8Yb ((BA)) 16 ((OH)) 10) ]Clクラスタの発光と磁気行動を調査する.
主な方法:
- 固体と溶液のEu3+/Yb3+非核群の合成と特徴付け
- 紫外線発光とダウンシフト放射を観測するためのスペクトル解析
- SMMの性質を決定する磁気感受性測定
主要な成果:
- 低濃度 (100 nM) でYb3+のNIR刺激によるE3+の可視放出で観察された効率的な協同感受性UC現象.
- 4.88 × 10-8のUC発光量である.
- Eu3+の可視刺激により,Yb3+のNIR放出をダウンシフトする.
- Yb3+の協同発光は500 nm近くで観測された.
- クラスターは4Kで 磁場誘発の単分子磁石の振る舞いを表しています
結論:
- [Eu8Yb ((BA)) 16 ((OH)) 10) ]Clクラスタは効率的なUC発光とSMM特性を示しています.
- このヘテロ核のクラスターは 光と磁気を統合した 次世代の装置の原型として機能します
さらに関連する動画
08:31Luminescence Resonance Energy Transfer to Study Conformational Changes in Membrane Proteins Expressed in Mammalian Cells
Published on: September 16, 2014
12.1K
11:26Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
12.6K
関連する概念動画
02:42Valence Bond Theory
8.5K
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...
8.5K
03:02Colors and Magnetism
11.6K
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...
11.6K
02:52Stereoisomerism
11.9K
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...
11.9K
01:07Nuclear Overhauser Enhancement (NOE)
672
Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
672
02:58Crystal Field Theory - Octahedral Complexes
26.4K
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...
26.4K
01:58Cooperative Allosteric Transitions
7.9K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
7.9K