宿主無機ナノカプセル内のゲスト移行金属:単一サイト,離散電子転送,原子スケール構造
Journal of the American Chemical Society
|August 14, 2020
まとめ
研究者達は,無機 {Mo132PO4} クラスターの中に移行金属を封じ込めることに成功しました. この突破は,潜在的光誘導スイッチと単一サイト光触媒の制御された電子転送を可能にします.
科学分野:
- 無機化学
- 材料科学
- ナノテクノロジー
背景:
- ホスト・ゲスト化学は伝統的に有機宿主を使用していますが,無機宿主も登場しています.
- ケプレラート型モリブデン酸化物群 ({Mo132}) は,有機客の無機宿主としての可能性を示している.
研究 の 目的:
- リン酸で覆われたケプラー酸塩群 ({Mo132PO4}) の内部で,第一列の移行金属 (Mn,Fe,Co) の制御された封じ込みを実証する.
- 結果として生じる宿主-ゲスト複合体を特徴付け,その電子的,磁的性質を調査する.
主な方法:
- ホスト-ゲスト複合体の合成.
- 31P NMR,ENDOR光譜,磁気感受性測定を用いた特徴付け
- 高度電子顕微鏡 (EFTEMによる球形および色差修正TEM) および可視光誘導XPSによる化学解像度電気測定 (CREM)
主要な成果:
- {Mo132PO4} ホスト内のMn,Fe,Coの成功した封じ込めは,光学および顕微鏡で確認されました.
- 磁気測定は 隔離された場所を示唆する ゲスト原子間の最小の相互作用を示した.
- カプセル化された移行金属 (M) から Mo ホストへの光誘導電子移転が観察された.
結論:
- 非有機ケプラー酸塩群の中に移行金属を封じ込むための新しい方法を示した.
- M{Mo132PO4}システムは制御された光誘導電子移転を示す.
- 潜在的応用には,光誘導スイッチと狭い空間内の単一サイト光触媒が含まれます.
関連する概念動画
04:00Periodic Classification of the Elements
57.3K
The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
57.3K
02:58Properties of Transition Metals
28.9K
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.
28.9K
02:42Valence Bond Theory
10.8K
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...
10.8K
02:58Crystal Field Theory - Octahedral Complexes
29.9K
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...
29.9K
03:02Colors and Magnetism
13.5K
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...
13.5K
02:46Electron Configurations
24.6K
Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
24.6K