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Related Concept Videos

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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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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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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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The thoracic or rib cage forms the body's thorax (chest) portion. Its primary function in the body is to protect vital organs in the thoracic cavity, such as the heart and the lungs. It consists of 12 pairs of ribs with their costal cartilages and the sternum. The ribs are anchored posteriorly to the 12 thoracic vertebrae (T1-T12).
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Ribs are curved, flattened bones forming the thoracic cavity wall with the thoracic muscles. There are 12 pairs of thoracic ribs. The posterior ends of all the ribs articulate with the T1–T12 thoracic vertebrae. In contrast,the anterior ends of most ribs attach to the sternum via their costal cartilages.
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Understanding the motion of particles is a fundamental aspect of classical mechanics, and the choice of the coordinate system plays a pivotal role in unraveling the complexities of their dynamics.
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Inflating face-capped Pd6L8 coordination cages.

Suzanne M Jansze1, Daniel Ortiz, Farzaneh Fadaei Tirani

  • 1Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland. kay.severin@epfl.ch.

Chemical Communications (Cambridge, England)
|August 11, 2018
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Summary
This summary is machine-generated.

Researchers created large palladium coordination cages using tritopic metalloligands. These novel Pd6L8-type structures are among the biggest palladium cages documented, with significant molecular weights and distances between palladium atoms.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Coordination cages are molecular structures with potential applications in catalysis and drug delivery.
  • The synthesis of large, well-defined coordination cages remains a challenge in supramolecular chemistry.
  • Palladium-based cages offer unique electronic and structural properties.

Purpose of the Study:

  • To synthesize and characterize novel, large-scale palladium coordination cages.
  • To explore the utility of tritopic metalloligands in constructing complex supramolecular architectures.
  • To investigate the structural parameters of the resulting palladium cages.

Main Methods:

  • Utilized tritopic metalloligands for cage assembly.
  • Employed palladium(II) precursors for coordination.
  • Characterized the resulting Pd6L8-type coordination cages using techniques such as mass spectrometry and X-ray crystallography.

Main Results:

  • Successfully synthesized two distinct Pd6L8-type coordination cages.
  • The coordination cages possess molecular weights exceeding 15 kDa.
  • Measured palladium-palladium distances up to 4.2 nm, confirming the large scale of the structures.

Conclusions:

  • Tritopic metalloligands are effective building blocks for constructing large palladium coordination cages.
  • The synthesized cages represent some of the largest palladium-based supramolecular structures reported.
  • These findings open avenues for developing advanced functional materials based on large coordination cages.