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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

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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.
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Valence Bond Theory02:42

Valence Bond Theory

8.8K
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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Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
19.2K
Network Covalent Solids02:18

Network Covalent Solids

12.8K
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.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.6K
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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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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A surface coordination network based on copper adatom trimers.

Fabian Bebensee1, Katrine Svane, Christian Bombis

  • 1Danish-Chinese Centre for Self-Assembly and Function of Molecular Nanostructures on Surfaces, Interdisciplinary Nanoscience Center (iNANO); Department of Physics and Astronomy, Aarhus University, Aarhus (Denmark).

Angewandte Chemie (International Ed. in English)
|September 25, 2014
PubMed
Summary
This summary is machine-generated.

Researchers created a new surface coordination network using copper adatom trimers and tetrahydroxybenzene. This novel structure, a 2D analogue of metal-organic frameworks, shows potential for catalysis and data storage applications.

Keywords:
copperdensity functional theorymetal-organic frameworksscanning tunneling microscopysurface coordination networks

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Area of Science:

  • Surface science
  • Materials chemistry
  • Nanotechnology

Background:

  • Surface coordination networks (SCNs) are formed by co-adsorbed metal atoms and organic ligands.
  • SCNs exhibit potential applications in catalysis and data storage.
  • Previous SCNs primarily utilized single metal atom centers.

Purpose of the Study:

  • To demonstrate the formation of a novel surface coordination network.
  • To investigate a network based on clusters of three copper (Cu) adatoms.
  • To characterize the structure and properties of this new network.

Main Methods:

  • Deposition of tetrahydroxybenzene (THB) on a Cu(111) surface under ultra-high vacuum (UHV) conditions.
  • High-resolution scanning tunneling microscopy (STM) for structural analysis.
  • X-ray photoelectron spectroscopy (XPS) for chemical state determination.
  • Density functional theory (DFT) calculations for mechanistic insights.

Main Results:

  • Formation of a novel SCN with network nodes composed of Cu adatom trimers.
  • Complete dehydrogenation of all four hydroxyl groups of THB upon thermal activation at 440 K.
  • THB ligands bind to Cu adatom trimers, forming an ordered array.
  • The network acts as a two-dimensional analogue of metal-organic frameworks (MOFs).

Conclusions:

  • A new class of SCNs based on metal adatom clusters has been successfully synthesized.
  • The developed SCN exhibits a unique 2D MOF-like structure.
  • This work opens new avenues for designing advanced materials with tunable properties for catalysis and data storage.