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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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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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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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Naming Enantiomers02:21

Naming Enantiomers

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The naming of enantiomers employs the Cahn–Ingold–Prelog rules that involve assigning priorities to different substituent groups at a chiral center. Each enantiomer, being a distinct molecule, is assigned a unique name by the Cahn–Ingold–Prelog (CIP) rules, also called the R–S system. The prefix R- or S- attached to the chiral centers in an enantiomer is dependent on the spatial arrangement of the four substituents on the chiral center. The R–S system...
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Identification of Enantiomers Using Low-Frequency Raman Spectroscopy.

Vinayaka Harshothama Damle1, Hagit Aviv1, Yaakov R Tischler1

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Low-frequency Raman (LFR) spectroscopy offers a new method for distinguishing enantiomers. By analyzing polarized light interactions, this technique provides a clear contrast for identifying chiral molecules.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Distinguishing between d and l enantiomers is crucial, particularly in the pharmaceutical industry.
  • Enantiomeric differentiation in solid forms remains a significant challenge.
  • Raman spectroscopy is a valuable, nondestructive technique for material characterization via vibrational modes.

Purpose of the Study:

  • To present low-frequency Raman (LFR) spectroscopy as a facile method for enantiomeric identification.
  • To engineer conventional Raman spectroscopy for enhanced chiral discrimination.
  • To establish a calibrated system for defining analyte chirality.

Main Methods:

  • Modified Raman spectroscopy setup with an asymmetrical focal cone for excitation and collection.
  • Incorporation of a half-wave retarder and a Glan-Taylor polarizer to control polarization planes.
  • Analysis of spectral intensity variations between co-polarized and orthogonally depolarized signals.

Main Results:

  • Engineered LFR spectroscopy successfully differentiates enantiomers.
  • Asymmetrical focal cones with polarized beams yield different signal intensities based on polarization.
  • A distinct intensity contrast between co-polarized and orthogonally depolarized signals was observed for chiral molecules.

Conclusions:

  • LFR spectroscopy, with modified optical geometry, provides a facile and distinct tool for enantiomeric identification.
  • The observed intensity contrast in LFR spectra serves as a reliable indicator of chirality.
  • This technique offers a promising solution for solid-form enantiomeric differentiation.