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相关概念视频

Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
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Atomic Structure01:33

Atomic Structure

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Overview
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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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Atomic Orbitals02:44

Atomic Orbitals

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An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
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sp3d and sp3d 2 Hybridization
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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...
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相关实验视频

Updated: Jun 10, 2025

Spatial Separation of Molecular Conformers and Clusters
10:37

Spatial Separation of Molecular Conformers and Clusters

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Au25 基于集群的原子精确协调框架和通过格子对称的排放工程.

Sinhyeop Kim1, Hyesun Kim1, Changhoon Lee2,3

  • 1Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

ACS nano
|October 10, 2024
PubMed
概括

合成新型集群组装材料 (CAMs) 用金纳米集群 (AuNCs) 和离子 (Zn2+) 增强近红外发光. 这一发现为调整先进纳米材料的光学特性提供了新的途径.

关键词:
一个纳米集群的au.集群组装材料 集群组装材料基于集群的框架.摄影光的发光效应超级格子 超级格子

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科学领域:

  • 纳米材料科学 科学 纳米材料科学
  • 材料化学 材料化学
  • 物理化学 物理化学

背景情况:

  • 原子精确的金属纳米集群 (NCs) 由于量子束而表现出超原子行为.
  • 它们独特的光学特性使其在传感,生物成像和光疗等领域的应用成为可能.
  • 集群组装材料 (CAMs) 通过控制集群间或集群内相互作用来修改NC光物理性质的途径.

研究的目的:

  • 用[Au25(p-HMBA) 18) - 和Zn2+来合成和描述两个不同的CAM,Au-Zn-Hex和Au-Zn-Rod.
  • 研究不同格子对称度对这些CAM的光物理性质的影响.
  • 为了阐明结构-属性关系,规范黄金纳米集群基于框架的发光.

主要方法:

  • 合成了两个不同的集群组装材料 (CAM):Au-Zn-Hex和Au-Zn-Rod.
  • 在[Au25(p-HMBA) [18]- (p-H2MBA = 4-mercaptobenzoic acid) 和Zn2+离子之间形成协调键.
  • 发光性质的表征,重点关注近红外辐射强度.

主要成果:

  • 与AU-Zn-Hex相比,Au-Zn-Rod CAM在近红外区域的发光强度是AU-Zn-Hex的6倍.
  • 在Au-Zn-Rod中增强的发光归因于集群内部和集群内部的协同相互作用.
  • 这些相互作用导致了激电离子的移位和原子尺度上的结构刚性化.

结论:

  • 基于集群的框架中的多种晶格对称性可以有效调整光物理性质.
  • 这项研究提供了更深入的理解金纳米集群 (AuNCs) 中的结构-属性关系.
  • 这项工作突出了CAMs在开发先进发光纳米材料方面的潜力.