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相关概念视频

Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

958
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
958
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.3K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
4.3K

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相关实验视频

Updated: Mar 25, 2026

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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具有高溶液稳定性的富勒类聚氧

Mei-Yan Gao1, Fei Wang1, Zhi-Gang Gu1

  • 1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou 350002, P. R. China.

Journal of the American Chemical Society
|February 20, 2016
PubMed
概括

研究人员合成了最大的氧团, 这种新型的{Ti42O60}核呈现出类似于C60富勒的二面体对称性.

科学领域:

  • 无机化学
  • 材料科学
  • 纳米技术

背景情况:

  • 氧化是具有多样性应用的关键材料.
  • 富勒烯结构,如C60,由于它们的球形,空洞的形性质而表现出独特的特性.
  • 复杂的高对称无机集群的合成仍然是一个重大挑战.

研究的目的:

  • 为了合成和描述一个新的,大型氧集群.
  • 在无机化合物中研究富勒类外结构的形成.
  • 探索氧化集群的结构和对称性.

主要方法:

  • 基于溶剂的氧集群的合成.
  • 电喷离子质谱 (ESI-MS) 用于溶液稳定性分析.
  • 高分辨率传输电子显微镜 (HR-TEM) 用于结构可视化.

主要成果:

  • 最大的氧集群的形成, [Ti42(μ3-O) 60(OiPr) 42(OH) 12) ](6-),具有富勒类的Ti-O外.
  • {Ti42O60} 核心表现出二面体 (Ih) 对称性,反映出C60富勒.
  • HR-TEM证实了外径为1.53nm和内径为1.05nm的球形结构.

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结论:

  • 氧化可以形成稳定的,类似富勒的外结构.
  • 合成的聚合物具有较高的二面体对称性,可与分子富勒烯相比较.
  • 这一发现为设计具有可调节性质的无机纳米材料开辟了新的途径.