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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

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.
Valence Bond Theory02:42

Valence Bond Theory

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...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

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...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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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Imagine taking a large number of identical...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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 the dxy,...

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Octanuclear cubic coordination cages.

Ian S Tidmarsh1, Thomas B Faust, Harry Adams

  • 1Department of Chemistry, University of Sheffield, UK.

Journal of the American Chemical Society
|October 16, 2008
PubMed
Summary
This summary is machine-generated.

Two novel bis-bidentate bridging ligands, L(naph) and L(anth), form cubic {M 8L 12} supramolecular cages with transition metals. The L(naph) cages exhibit enhanced stability in polar solvents due to pi-stacking interactions, unlike the L(anth) cages.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Development of novel ligands for constructing complex supramolecular architectures.
  • Investigation of metal-ligand interactions in self-assembled cages.
  • Understanding the influence of ligand structure on cage properties and stability.

Purpose of the Study:

  • Synthesize and characterize new bis-bidentate bridging ligands, L(naph) and L(anth).
  • Explore the self-assembly of {M 8L 12} supramolecular cages using these ligands and various transition metals.
  • Investigate the structural differences and stability of cages formed with L(naph) versus L(anth) ligands.

Main Methods:

  • Ligand synthesis and characterization.
  • X-ray crystallography for structural determination of the supramolecular cages.
  • Spectroscopic techniques (NMR, fluorescence) to study cage properties and stability in solution.
  • Analysis of metal-ligand coordination and intermolecular interactions.

Main Results:

  • Successful synthesis of L(naph) and L(anth) ligands.
  • Formation of cubic {M 8L 12} cages with transition metals (Cu, Zn, Co, Ni, Cd).
  • Structural elucidation revealed distinct architectures: L(anth) cages with helical faces, L(naph) cages with S6 symmetry and peripheral pi-stacking.
  • L(naph) cages demonstrated superior stability in polar solvents compared to L(anth) cages due to aromatic stacking.
  • Fluorescence studies of Cd-L(naph) cages showed charge-transfer emission from pi-stacked ligands.

Conclusions:

  • The design of bis-bidentate bridging ligands with specific aromatic spacers influences the self-assembly and stability of supramolecular cages.
  • Peripheral aromatic pi-stacking in L(naph) cages enhances their structural integrity in solution.
  • These findings offer insights into the rational design of robust and functional supramolecular materials.