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Related Concept Videos

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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Electron Configurations02:46

Electron Configurations

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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
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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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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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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 - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

48.2K
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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Cu14 Cluster with Partial Cu(0) Character: Difference in Electronic Structure from Isostructural Silver Analog.

Yan-Ling Li1, Jie Wang1, Peng Luo1

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|September 28, 2019
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Summary

A novel copper cluster, Cu14-8CH3CN, exhibits unique electronic properties and room-temperature luminescence. This copper cluster serves as a platform for studying differences between copper and silver nanoscale systems.

Keywords:
Cu clustersCu(0) characteranalogselectronic structureluminescence

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Area of Science:

  • * Inorganic Chemistry
  • * Materials Science
  • * Nanotechnology

Background:

  • * Atom-precise metal clusters are crucial for understanding fundamental chemical properties.
  • * Copper and silver clusters offer a unique comparison due to their similar structures but distinct electronic behaviors.
  • * Developing analogous systems is key to probing structure-property relationships.

Purpose of the Study:

  • * To synthesize and characterize a novel atom-precise copper cluster, Cu14(C2B10H10S2)6(CH3CN)8 (Cu14-8CH3CN).
  • * To compare the electronic structure and properties of Cu14-8CH3CN with its silver analog, Ag14-8CH3CN.
  • * To investigate the catalytic and optical properties of the copper cluster.

Main Methods:

  • * Simultaneous reduction strategy for synthesis.
  • * Single-crystal X-ray diffraction, ESI-TOF-MS, and X-ray photoelectron spectroscopy for characterization.
  • * Density functional theory (DFT) calculations for electronic structure analysis.

Main Results:

  • * Successful synthesis and full characterization of Cu14-8CH3CN.
  • * Identification of a structurally analogous silver cluster, Ag14-8CH3CN.
  • * DFT calculations revealed significant differences in electronic structure despite structural similarity.
  • * Cu14-8CH3CN demonstrated room-temperature luminescence and electrocatalytic activity.

Conclusions:

  • * The synthesized copper cluster, Cu14-8CH3CN, possesses distinct electronic properties compared to its silver analog.
  • * The Cu14-8CH3CN cluster exhibits promising room-temperature luminescence and electrocatalytic capabilities.
  • * This pair of analogous nanoscale systems provides a valuable platform for fundamental research into copper versus silver properties.