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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
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Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins
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Published on: December 27, 2016

Infrared spectroscopy of different phosphates structures.

W Jastrzębski1, M Sitarz, M Rokita

  • 1AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059 Krakow, Poland. witjas@agh.edu.pl

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

This study analyzes infrared (IR) spectra of phosphates, detailing P-O vibration bands and phase composition. Cation influence on spectra and crystalline field splitting were investigated using IR spectroscopy and X-ray diffraction (XRD).

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Area of Science:

  • Mineralogy and Spectroscopy
  • Solid-state Chemistry
  • Materials Science

Background:

  • Phosphates are crucial in geology and industry.
  • Understanding their vibrational properties is key to characterization.
  • Infrared (IR) spectroscopy provides insights into molecular structure and bonding.

Purpose of the Study:

  • To interpret infrared (IR) spectra of mineral and synthetic phosphates.
  • To establish the number and positions of bands related to P-O vibrations.
  • To analyze the influence of cations on spectral features and discuss crystalline field splitting.

Main Methods:

  • Infrared (IR) spectroscopy for vibrational analysis.
  • X-ray diffraction (XRD) for phase composition determination.
  • Analysis of isolated phosphate tetrahedra and aqueous solutions.

Main Results:

  • Established characteristic bands for P-O vibrations in phosphates.
  • Determined phase composition using combined XRD and IR methods.
  • Observed and analyzed the effect of non-tetrahedral cations on spectral band positions and shapes.

Conclusions:

  • IR spectroscopy is effective for phosphate characterization and phase analysis.
  • Cation identity significantly influences phosphate spectral properties.
  • The study provides a foundation for understanding phosphate structures via vibrational spectroscopy.