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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Properties of Transition Metals02:58

Properties of Transition Metals

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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.
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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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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在零维Cu (I) 基金属化物中可逆结构相位过渡,用于动态调节的排放.

Ran An1,2, Qishun Wang2, Yuan Liang2,3

  • 1Faculty of Chemistry, Northeast Normal University, Jilin, Changchun, 130024, China E-mail: addresses.

Angewandte Chemie (International ed. in English)
|September 12, 2024
PubMed
概括

两个新的零维金属化物, (C19H18P) 2CuI3和 (C19H18P) 2Cu4I6,表现出明显的发光和可逆相变. 这些特性使得具有动态色彩转移的独特防伪系统成为可能.

关键词:
打击假冒和伪造的行为混合金属化物混合金属化物结构阶段过渡 结构阶段过渡可调节的排放量.这是一个零维的零维空间.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态化学 固态化学
  • 光物理学的光学物理学

背景情况:

  • 零维 (0D) 金属化物对于可调节的光学特性至关重要,但在理解它们的发光和相变方面面临挑战.
  • 开发具有可控制光学功能的新材料对于先进应用是必不可少的.

研究的目的:

  • 设计和合成可相互转换的 0D Cu (I) 基金属化物.
  • 阐明它们的发光机制和结构相变.
  • 探索它们在防伪应用中的潜力.

主要方法:

  • 在不同的条件下合成 (C19H18P) 2CuI3和 (C19H18P) 2Cu4I6.
  • 对光学特性和发光的实验性表征.
  • 密度函数理论 (DFT) 计算用于机制阐明.
  • 研究可逆结构相变的研究.

主要成果:

  • 合成了两种可相互转换的0D Cu ((I) 金属化物,即 (C19H18P) 2CuI3和 (C19H18P) 2Cu4I6.
  • (C19H18P) 2CuI3 显示自捕获刺激子的明亮辐射 (77% PLQY).
  • (C19H18P) 2Cu4I6由于电荷转移效应和Cu-Cu结合而表现出黄色色的光 (83% PLQY).
  • 这两种化合物都表现出可逆的结构相变.

结论:

  • 该研究提供了对0D金属化物发光机制和相变的洞察.
  • 可逆相位转换使得具有颜色转换能力的动态防伪系统成为可能.
  • 这项工作为调节光学特性和开发先进光学材料提供了新的策略.