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Raman spectroscopy as tool for the characterization of thio-polyaromatic hydrocarbons in organic minerals

Authors
Journal
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
1386-1425
Publisher
Elsevier
Publication Date
Volume
68
Issue
4
Identifiers
DOI: 10.1016/j.saa.2006.12.033
Keywords
  • Raman Spectroscopy
  • Idrialite
  • Polyaromatic Hydrocarbon
  • Fullerene
  • Thiophene

Abstract

Abstract Benzothiophene and dibenzothiophene have been studied by Raman microspectroscopy using a 785 nm excitation wavelength. The spectra obtained have been compared with the previously measured spectra of idrialite, a complex natural mineral composed entirely of cata-condensed polyaromatic hydrocarbons (PAHs), usually containing a thiophenic or aliphatic five-membered ring. For comparison, the Raman spectra of 2,3-benzofluorene crystals have been obtained for the first time. Some of the bands in the idrialite spectra are attributed to specific vibrational modes of thiophene or fluorene-type PAHs, especially in the region bellow 1000 cm −1. These modes at 495, 705 and 750 cm −1 along with C–H or C–H 2 stretching modes around 3000 cm −1 can be then used to distinguish such groups of PAHs in complicated organic mineral mixtures like idrialite.

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