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An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum...
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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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.
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Hierarchical structural complexity in atomically precise nanocluster frameworks.

Xiao Wei1, Xi Kang1, Zewen Zuo2

  • 1Department of Chemistry and Centre for Atomic Engineering of Advanced Materials, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei 230601, China.

National Science Review
|October 25, 2021
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate hierarchical assembly of atomically precise silver nanoclusters (Ag29(SSR)12) into 1D, 2D, and 3D arrays by controlling adsorbed molecules and Cs+ cations. These assemblies exhibit distinct optical properties and varied surface areas.

Keywords:
1D linear chain2D grid network3D superstructureatomically precise nanoclusterhierarchical structural complexity

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Area of Science:

  • Supramolecular chemistry
  • Nanotechnology
  • Materials science

Background:

  • Controllable assembly of nanocluster building blocks into diverse arrays is a significant challenge in nanoresearch.
  • Atomically precise nanoclusters offer unique properties but require sophisticated assembly strategies.

Purpose of the Study:

  • To investigate the hierarchical structural complexity and self-assembly of atomically precise nanoclusters.
  • To demonstrate the controlled formation of 1D, 2D, and 3D nanocluster arrays using specific cations and solvent molecules.

Main Methods:

  • Utilized Cs+ cations and various oxygen-carrying solvent molecules (DMF, NMP, TMS) to direct the self-assembly of Ag29(SSR)12 nanoclusters.
  • Characterized the crystalline and amorphous states of the assembled nanoclusters.
  • Analyzed optical absorption and emission properties of the different assemblies.
  • Evaluated the surface areas of the nanocluster crystals.

Main Results:

  • Achieved hierarchical assembly of Ag29(SSR)12 nanoclusters into linear chains (1D), grid networks (2D), and superstructures (3D).
  • Observed self-assembly in both crystalline and amorphous states.
  • Demonstrated distinct optical absorption and emission behaviors for each assembly type.
  • Found that 2D grid networks exhibit the maximum surface area.

Conclusions:

  • The study successfully presents a method for hierarchical assembly of atomically precise nanoclusters by manipulating adsorbed molecules on the cluster surface.
  • The findings highlight the potential for creating complex nanostructures with tunable properties through controlled self-assembly.
  • This work opens avenues for designing advanced nanomaterials with tailored optical and surface characteristics.