Raman spectroscopy as tool for the characterization of thio-polyaromatic hydrocarbons in organic minerals.
Spectrochim Acta A Mol Biomol Spectrosc
; 68(4): 1065-9, 2007 Dec 15.
Article
en En
| MEDLINE
| ID: mdl-17307383
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 below 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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Banco de datos:
MEDLINE
Asunto principal:
Hidrocarburos Policíclicos Aromáticos
/
Espectrometría Raman
/
Compuestos de Azufre
/
Minerales
Idioma:
En
Año:
2007
Tipo del documento:
Article