Surface-enhanced Raman spectroscopy of indanthrone and flavanthrone

• NCJ Number: 304164
• Journal: Journal of Raman Spectroscopy Volume: 40 Issue: 11 Dated: 2009 Pages: 1557-1563
• Author(s): Jingjing Chang; Maria Vega Cañamares; Metin Aydin; Wilfried Vetter; Manfred Schreiner; Weiqing Xu; John R. Lombardi
• Date Published: 2009
• Length: 7 pages
• Grant Number(s): 2006-DN-BX-K034
• Agencies: NIJ-Sponsored
• Publication Type: Research (Applied/Empirical)
• Award: Development of Advanced Raman Spectroscopy Methods and Databases for the Evaluation of Trace Evidence and the Examination of Questioned Documents

Annotation

This study obtained the normal Raman and surface-enhanced Raman scattering (SERS) spectra of flavanthrone and indanthrone at several excitation wavelengths.

 

Abstract

The spectral assignments were aided by density functional calculations. Since both molecules have very high symmetry (C2h) including a center of inversion, the researchers expected that the modes of u symmetry would be forbidden in the normal Raman spectrum; however, proximity to the surface caused special SERS enhancement of several of the bu modes, along with somewhat weaker enhancement of the au and bg modes. (publisher abstract modified)