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Related Concept Videos

Chirality02:25

Chirality

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Coordination Number and Geometry02:57

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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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Chirality in Nature02:30

Chirality in Nature

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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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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Lattice Centering and Coordination Number02:33

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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.
Types of Unit Cells
Imagine taking a large number of identical...
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Axial and Appendicular Muscles01:18

Axial and Appendicular Muscles

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Skeletal muscles, the key players in our body's movement, can be classified into two groups based on their location and function: axial muscles and appendicular muscles. These classifications reflect the primary roles the muscles play in the body's structure and movement.
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A Micropatterning Assay for Measuring Cell Chirality
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Chiral Phthalocyanines through Axial Coordination.

Dora M Răsădean1, Tiberiu M Gianga1, Alexander H Swan1

  • 1Department of Chemistry , University of Bath , Bath , BA2 7AY , U.K.

Organic Letters
|April 21, 2018
PubMed
Summary

Chirality was successfully induced on silicon phthalocyanines using a microwave-assisted method. This novel approach transferred chirality to the phthalocyanine core, with a specific ligand showing the strongest effect.

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Spectroscopy

Background:

  • Silicon phthalocyanines are macrocyclic compounds with potential applications in various fields.
  • Inducing axial chirality in such systems is challenging but can lead to unique chiroptical properties.
  • Microwave-assisted synthesis offers a rapid and efficient route for chemical modifications.

Purpose of the Study:

  • To develop a novel method for inducing axial chirality in silicon phthalocyanines.
  • To investigate the transfer of chirality to the phthalocyanine core's electronic transitions.
  • To identify chiral ligands that effectively induce chirality in the macrocycle.

Main Methods:

  • Microwave-assisted synthesis was employed to axially functionalize silicon phthalocyanines.
  • Circular Dichroism (CD) spectroscopy was used to analyze the induced chirality.
  • Various chiral naphthalenediimide ligands were synthesized and tested for their chiral induction efficiency.

Main Results:

  • A novel microwave-assisted route successfully induced axial chirality on silicon phthalocyanines.
  • CD analysis confirmed the transfer of chirality to both the Soret and Q-bands of the phthalocyanine core.
  • A specific chiral naphthalenediimide ligand demonstrated the most significant Cotton effect on the macrocycle's absorptions.

Conclusions:

  • Axial chirality can be effectively introduced onto silicon phthalocyanines using microwave-assisted synthesis.
  • The induced chirality impacts the electronic properties of the phthalocyanine macrocycle, as evidenced by CD spectroscopy.
  • The choice of chiral ligand is crucial for maximizing the chiroptical response in these systems.