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関連する概念動画

Valence Bond Theory02:42

Valence 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...
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
Stereoisomerism02:52

Stereoisomerism

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...
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...

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関連する実験動画

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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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混合バレンスのエウロピウムニトリドシリケートEu2SiN3

Martin Zeuner1, Sandro Pagano, Philipp Matthes

  • 1Ludwig-Maximilians-Universität München, Department Chemie und Biochemie, D-81377 München, Germany.

Journal of the American Chemical Society
|July 21, 2009
PubMed
まとめ

研究者らは混合バレンスのエウロピウムニトリドシリケートEu(2) SiN(3) を合成し,新しい鎖型シリケート構造を明らかにした. この化合物は,24 Kの異常な高温で静的混合ヴァレンンスとフェロ磁気順序を示す.

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
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科学分野:

  • 固体化学 固体化学
  • 無機物質科学 無機物質科学
  • クリスタルグラフィーです.

背景:

  • 混合バレンスの化合物は,ユニークな電子および磁気特性を有する.
  • ニトリドシリケートは,潜在的な応用を持つ新興の無機材料のクラスです.
  • 新しい材料の構造-特性関係を理解することは,材料発見にとって極めて重要です.

研究 の 目的:

  • 新型混合バレンスのエウロピウムニトリドシリケート,Eu(2) SiN(3) を合成し,特徴づけること.
  • 結晶構造を決定し,Eu(2) SiN(3) の電子および磁気特性を調査する.
  • ナトリドシリケートの高度な機能的材料としての可能性を調査する.

主な方法:

  • ユーロピウム,シリコン二酸化物,およびリチウム流体を用いて900°CでEu(2) SiN(3) を合成する.
  • 単一結晶のX線微分分析により結晶構造を決定する (Cmca,a=542.3(11) pm,b=1061.0(2) pm,c=1162.9(2) pm).
  • (151) Eu Mössbauerスペクトロスコーピー,磁気感受性測定,および電子および磁気特性を調査するためのDFT計算.

主要な成果:

  • 結晶構造は,角を共有するSiN(4) 四面体の1次元の無限無枝のジューイヤー鎖を明らかにしています.
  • Eu(2) SiN(3) は,Mössbauer光譜で確認された,等原子 Eu(2+) と Eu(3+) 位を持つ静的混合バレンスを示しています.
  • フェロマグネティック・オーダーリングは,T ((C) = 24 Kの異常な高温で観測され,帯差は約0.2 eVでした.

結論:

  • Eu(2) SiN(3) は,ナイトリドシリケートクラスの最初の無枝鎖シリケートである.
  • この化合物は,混合バレンスの性質と結晶構造によりユニークな磁気特性を示しています.
  • この発見は,調節可能な電子および磁気機能を持つニトリドシリケート材料の研究に新しい道を開きます.