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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.0K
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...
18.0K
Valence Bond Theory02:42

Valence Bond Theory

8.3K
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...
8.3K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

40.6K
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...
40.6K
Stereoisomerism02:52

Stereoisomerism

11.6K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.6K
Coordination Number and Geometry02:57

Coordination Number and Geometry

15.2K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.2K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

30.9K
sp3d and sp3d 2 Hybridization
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Updated: May 9, 2025

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

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Assembling Octahedral Pt2Ag4 Clusters for High-Efficiency Circularly Polarized Luminescence.

Miao-Miao Zhang1,2, Ran Zhang1, Shi-Yu Yang1

  • 1Henan Key Laboratory of Crystalline Molecular Functional Materials and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|May 6, 2025
PubMed
Summary

Researchers developed chiral platinum-silver (Pt-Ag) clusters for efficient circularly polarized luminescence (CPL). These self-assembled clusters exhibit enhanced photoluminescence quantum yield (PLQY) and tunable optical properties, paving the way for advanced luminescent materials.

Keywords:
alloy clusterchiral assemblychiroptical switchcircularly polarized luminescencemetal cluster

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Achieving atom-precise self-assembly of metal clusters for efficient circularly polarized luminescence (CPL) presents significant challenges.
  • Controllable synthesis of chiral metal clusters is crucial for advanced optical applications.

Purpose of the Study:

  • To construct enantiomeric pairs of dimer metal clusters with enhanced CPL properties.
  • To investigate the self-assembly behavior and optical switching capabilities of chiral Pt-Ag clusters.
  • To explore the formation of 3D chiral structures for high-efficiency luminescence.

Main Methods:

  • Synthesis of R/S-Pt4Ag8-green and R/S-Pt4Ag8-orange dimer clusters from Pt2Ag4 monomers.
  • Characterization of photoluminescence quantum yield (PLQY) in solution and solid-state.
  • Modulation of intercluster distances and arrangements via ligand configuration and solvent stimuli.
  • Assembly of chiral Pt-Ag clusters with Ag+ to form 3D cubic lattices.

Main Results:

  • Constructed chiral Pt-Ag dimer clusters with a 28-fold increase in PLQY compared to monomers.
  • Achieved 87% PLQY in solid-state chiral dimers without aggregation-caused quenching.
  • Demonstrated reversible transformations between chiral single crystals with high-contrast optical/chiroptical switching.
  • Synthesized a chiral 3D cubic lattice exhibiting high-efficiency red-emitting CPL.

Conclusions:

  • Atom-precise self-assembly of chiral Pt-Ag clusters offers a new route to high-efficiency CPL materials.
  • Tunable assembly and optical properties enable smart CPL switching applications.
  • Controlling metal-metal interactions is key to designing advanced luminescent cluster assemblies.