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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

1.0K
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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
1.0K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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 of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.4K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.4K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.1K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
1.1K
Spectroscopy of Carboxylic Acid Derivatives01:26

Spectroscopy of Carboxylic Acid Derivatives

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Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...
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Solid-State Analysis of Alpha-Cyclodextrin Inclusion Complexes Using Low-Frequency Raman Spectroscopy.

Motoki Inoue1, Hiroshi Hisada1, Kazuhiko Takatori1

  • 1Meiji Pharmaceutical University, 2-522-1, Noshio, Kiyose, Tokyo 204-8588, Japan.

Analytical Chemistry
|December 7, 2020
PubMed
Summary
This summary is machine-generated.

Low-frequency Raman spectroscopy effectively analyzes crystalline cyclodextrin inclusion complexes in solid forms. This nondestructive technique reveals differences not visible with conventional Raman spectroscopy, aiding in solid-state analysis.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Analyzing cyclodextrin inclusion complexes in solid dosage forms requires rapid, nondestructive methods.
  • Conventional Raman spectroscopy has limitations in differentiating certain inclusion complexes from raw materials.

Purpose of the Study:

  • To evaluate low-frequency Raman spectroscopy as a novel technique for analyzing crystalline cyclodextrin inclusion complexes.
  • To demonstrate the superiority of low-frequency Raman spectroscopy over conventional Raman spectroscopy for solid-state analysis.

Main Methods:

  • Investigated five crystalline cyclodextrin inclusion complexes.
  • Acquired and analyzed conventional Raman spectra.
  • Acquired and analyzed low-frequency Raman spectra.

Main Results:

  • Conventional Raman spectroscopy showed clear differences for some inclusion complexes but not others.
  • Low-frequency Raman spectroscopy revealed characteristic differences between inclusion complexes and raw materials, even when conventional spectra were similar.
  • Low-frequency Raman spectroscopy distinguished inclusion complexes with different guest molecules, unlike conventional Raman spectroscopy.

Conclusions:

  • Low-frequency Raman spectroscopy is a valuable and sensitive technique for the solid-state analysis of crystalline cyclodextrin inclusion complexes.
  • This method offers advantages over conventional Raman spectroscopy for complex analysis where subtle spectral differences exist.