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関連する概念動画

Colors and Magnetism03:02

Colors and Magnetism

13.9K
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...
13.9K
Valence Bond Theory02:42

Valence Bond Theory

11.1K
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...
11.1K
Properties of Transition Metals02:58

Properties of Transition Metals

29.4K
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.
29.4K
Coordination Number and Geometry02:57

Coordination Number and Geometry

18.8K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
18.8K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.8K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
23.8K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.4K
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...
30.4K

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Updated: Jan 8, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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パラマグネティック遷移金属ヒドリド錯体

Adi Fishkin1, Robert H Morris1

  • 1Department of Chemistry, University of Toronto, 80 Saint George St., Toronto, Ontario M5S3H6, Canada.

Chemical reviews
|December 22, 2025
PubMed
まとめ
この要約は機械生成です。

パラマグネティックヒドリド錯体（PHC）は、ジアマグネティック類似体よりも弱い金属-水素結合を示す。それらの多様な反応性と地球上で豊富な金属における普及は、持続可能な触媒の可能性を強調している。

キーワード:
パラマグネティックヒドリド錯体金属水素結合持続可能な触媒地球上で豊富な金属有機金属化学触媒

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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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科学分野:

  • 無機化学
  • 有機金属化学
  • 触媒

背景:

  • パラマグネティックヒドリド錯体（PHC）は、化学反応の理解において重要である。
  • これらの錯体の特性評価は、結合と反応性に関する洞察を提供する。

研究 の 目的:

  • PHCの構造、結合、エネルギー論、調製、特性評価、および反応を分類すること。
  • PHCの特性とその触媒への応用における傾向を明らかにすること。

主な方法:

  • 末端および架橋ヒドリドの結晶学的特性評価。
  • 実験的および理論的な結合エネルギーの表。
  • 磁気測定および電子常磁性共鳴（EPR）研究。
  • 超微細結合定数およびNMRデータの分析。

主要な成果:

  • PHCは、ジアマグネティックヒドリドと比較して、類似の配位子を持つ場合、より弱いM-H結合を示す。
  • 架橋ヒドリドは、反強磁性結合により、しばしば磁気モーメントが低下する。
  • 結合軌道とフェルミコンタクト項の影響を受けた、広範囲の超微細結合定数が観察された。
  • 10個の化合物で、パラマグネティック状態でのヒドリド1H NMR共鳴が観察された。
  • 疑わしいPHCを含む40以上の均一触媒プロセスが詳述された。

結論:

  • PHCは、ユニークな結合と反応性のパターンを示す。
  • 地球上で豊富な金属におけるそれらの普及は、持続可能な触媒にとって非常に重要である。
  • PHCの特性と応用に関するさらなる研究が保証される。