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相关概念视频

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Valence Bond Theory02:42

Valence Bond Theory

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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...
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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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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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在水中溶解的五角晶体氧集群

Guanyun Zhang1, Caiyun Liu1, De-Liang Long2

  • 1Key Lab for Colloid and Interface Science of Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University , Ji'Nan 250100, P. R. China.

Journal of the American Chemical Society
|August 16, 2016
PubMed
概括

研究人员结晶了具有独特{Ti18O27}核心的新型氧团. 这些稳定,可溶性对表面修饰和同质光催化应用具有前景.

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科学领域:

  • 无机化学
  • 材料科学
  • 纳米技术

背景情况:

  • 氧化材料在催化和表面修饰中至关重要.
  • 控制核前集群的结晶是合成新材料的关键.

研究的目的:

  • 合成和描述一个新的氧集群.
  • 探索这些集群在表面修饰和光催化中的潜在应用.

主要方法:

  • 核前结晶的可溶性控制.
  • 电喷离子质谱学 (ESI-MS).
  • 核磁共振 (NMR) 和振动光谱学.

主要成果:

  • 成功合成了以三层五角镜排列的{Ti18O27}核心的氧.
  • 合成的聚合物在各种溶剂中具有良好的溶解性和稳定性,如酸和水.
  • 鉴定证实了氧团的独特结构和特性.

结论:

  • 这项研究提出了一种合成氧集群的新方法.
  • 这些集群是表面修饰和同质光催化技术中先进应用的有希望的候选者.
  • 这些发现为设计功能性基材料开辟了新的途径.