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Related Concept Videos

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.
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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.
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Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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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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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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Structures of Solids

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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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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Quasicrystallinity expressed in two-dimensional coordination networks.

José I Urgel1, David Écija2, Guoqing Lyu3

  • 1Physik-Department E20, Technische Universität München, D-85748 Garching, Germany.

Nature Chemistry
|June 22, 2016
PubMed
Summary
This summary is machine-generated.

Researchers created a novel 2D quasicrystalline tiling using rare-earth-directed assembly in metal-organic coordination networks (MOCNs). This breakthrough introduces quasicrystalline order into surface-confined MOCNs with nanoporous structures.

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Quasicrystals represent a distinct class of materials with long-range order but no translational symmetry.
  • Metal-organic architectures, including metal-organic coordination networks (MOCNs), are versatile systems with diverse applications.
  • Quasicrystalline order has been notably absent in surface-confined MOCNs until now.

Purpose of the Study:

  • To investigate the possibility of achieving quasicrystalline order in surface-confined metal-organic coordination networks.
  • To construct and characterize a two-dimensional tiling with quasicrystalline properties on a gold substrate.

Main Methods:

  • Utilized rare-earth-directed assembly for constructing the network.
  • Employed precise stoichiometry control of europium centers and functional linkers.
  • Analyzed the resulting structure using scanning tunneling microscopy (STM).

Main Results:

  • Successfully constructed a 2D tiling with quasicrystalline characteristics on a gold substrate.
  • Achieved simultaneous expression of four-fold, five-fold, and six-fold vertices within the network.
  • Identified the molecule-europium reticulation as a square-triangle tessellation exhibiting dodecagonal symmetry.

Conclusions:

  • Demonstrated the introduction of quasicrystallinity into surface-confined MOCNs.
  • Created a nanoporous network with unique quasicrystalline ordering.
  • Anticipated novel functionalities arising from the quasicrystalline arrangement of coordinative spheres.