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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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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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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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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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Nuclear Transmutation03:20

Nuclear Transmutation

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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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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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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Bi/trinuclear Pt1,2Cu cluster assembly from isolated metal atoms.

Huixiang Li1, Changhui Liang1,2, Kairui Liu1

  • 1Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China. zczhang@yahoo.com.

Chemical Communications (Cambridge, England)
|March 10, 2022
PubMed
Summary

We developed an easy liquid-phase method to create uniform platinum-copper (Pt-Cu) nano-clusters. This technique precisely controls the number of metal atoms, yielding reduced chemical states for enhanced catalytic applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Precise synthesis of multi-metal atomic clusters is challenging.
  • Controlling the number and composition of metal atoms is crucial for catalytic activity.
  • Liquid-phase synthesis offers potential for scalable production.

Purpose of the Study:

  • To develop a facile liquid-phase strategy for synthesizing uniform heterometallic bi/tri-atom clusters.
  • To precisely control the formation of platinum-copper (Pt-Cu) clusters.
  • To investigate the chemical states of metal atoms within the synthesized clusters.

Main Methods:

  • Utilizing a protective layer (PDMS-PEG) for controlled reactions.
  • Employing ethanol as a reducing agent for copper chloride (CuCl2).
  • Synthesizing Pt1,2Cu bi/tri-atoms by reducing CuCl2 at preformed Pt1 atoms.

Main Results:

  • Achieved facile synthesis of uniform heterometallic Pt-Cu bi/tri-atom clusters.
  • Demonstrated precise control over cluster composition (Pt1,2Cu).
  • Confirmed that metal atoms within the Pt-Cu clusters are in reduced chemical states.

Conclusions:

  • The reported method offers a straightforward approach for producing uniform Pt-Cu atomic clusters.
  • The synthesized clusters exhibit reduced chemical states, suggesting potential for catalytic applications.
  • This liquid-phase strategy is promising for scalable and controlled synthesis of multi-metal atomic clusters.