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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Preparation and Reactions of Thiols

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Channel Rhodopsins01:11

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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
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Disulfide chromophore and its optical activity.

Petr Maloň1, Lucie Bednárová, Michal Straka

  • 1Institute of Organic Chemistry and Biochemistry, Prague 6, 166 10, Czech Republic. malon@uochb.cas.cz

Chirality
|November 2, 2010
PubMed
Summary

Researchers studied disulfide bond conformation using novel cyclodextrin models. Raman optical activity (ROA) spectroscopy revealed the disulfide bond

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Area of Science:

  • Supramolecular Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Disulfide bonds are crucial for protein structure and function.
  • Spectroscopic analysis of disulfide conformation is often complicated by overlapping signals.
  • Cyclodextrins offer unique scaffolds for model compound development.

Purpose of the Study:

  • To develop novel cyclodextrin-based disulfide compounds (I-IV) as models.
  • To spectroscopically investigate the conformation of disulfide bridges.
  • To enable clear spectral analysis by minimizing overlap with common biomolecular signals.

Main Methods:

  • Synthesis of α-D-cyclodextrin derivatives with disulfide linkages.
  • Absorption and electronic circular dichroism (ECD) spectroscopy.
  • Raman optical activity (ROA) spectroscopy.
  • Quantum mechanical calculations for spectral interpretation.

Main Results:

  • Compounds I-IV successfully modeled disulfide bridge conformation.
  • Distinct spectral features for S-S and C-S stretching were identified via ROA.
  • The energy gap facilitated clear spectroscopic analysis without biomolecular interference.

Conclusions:

  • The study provides a robust method for analyzing disulfide bond conformation.
  • ROA spectroscopy is effective in determining the twist sense of disulfide bonds.
  • Cyclodextrin-based models offer a valuable tool for spectroscopic studies of disulfide linkages.