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Raman Spectroscopy: Overview01:20

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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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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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IR Spectroscopy: Molecular Vibration Overview01:24

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Polymorph Discrimination using Low Wavenumber Raman Spectroscopy.

Saikat Roy1, Brianna Chamberlin1, Adam J Matzger1

  • 1Department of Chemistry and the Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, Michigan 48109, United States.

Organic Process Research & Development
|September 20, 2016
PubMed
Summary
This summary is machine-generated.

Low wavenumber Raman spectroscopy, including phonon measurements, effectively distinguishes between pharmaceutical polymorphs. This technique offers enhanced discrimination power for identifying crystal phases and structural changes in drug development.

Keywords:
PharmaceuticalsPhononsProcess analytical technology (PAT)Vibrational spectroscopy

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Pharmaceutical Sciences

Background:

  • Crystalline polymorph characterization is crucial in pre-clinical drug development.
  • Raman spectroscopy is a rapid method for identifying pharmaceutical phases.

Purpose of the Study:

  • To demonstrate the utility of low wavenumber Raman vibrational spectroscopy for discriminating between polymorphic forms.
  • To assess the application of phonon measurements in pharmaceutical analysis.

Main Methods:

  • Utilized low wavenumber Raman spectroscopy (10-400 cm-1) on 10 polymorphic pharmaceuticals.
  • Analyzed crystal lattice vibrations and phonon Raman scattering.

Main Results:

  • Low wavenumber Raman spectroscopy effectively discriminated among polymorphic phases.
  • This method provided additional discriminating power over conventional strategies.
  • Detected structural insights and conformational changes.

Conclusions:

  • Low wavenumber Raman spectroscopy, including phonon analysis, is a powerful tool for rapid polymorph discrimination.
  • This approach enhances the characterization of pharmaceutical solid forms.