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Type: Artigo
Title: Fullerenes In Asphaltenes And Other Carbonaceous Materials: Natural Constituents Or Laser Artifacts
Author: Santos
Vanessa G.; Fasciotti
Maira; Pudenzi
Marcos A.; Klitzke
Clecio F.; Nascimento
Heliara L.; Pereira
Rosana C. L.; Bastos
Wagner L.; Eberlin
Marcos N.
Abstract: The presence of fullerenes as natural constituents of carbonaceous materials or their formation as laser artifacts during laser desorption ionization (LDI) mass spectrometry (MS) analysis is reinvestigated and reviewed. The results using asphaltene samples with varying composition as well as standard polycyclic aromatic hydrocarbons (PAH) and fullerene samples as models have demonstrated that indeed C-n ring fullerenes are not natural constituents but they are formed as common and often as predominant artifacts upon laser radiation, and a series of incorrect assignments based on LDI-MS data of several carbonaceous materials seems unfortunately to have been made. When the present results are evaluated also in the light of the vast literature on LDI-MS of carbonaceous materials, the formation of fullerene artifacts seems particularly common for LDI-MS analysis of asphaltenes and other carbonaceous samples with considerably high levels of PAH and varies according to the type of laser used, and the intensity of the laser beam.
Editor: Royal Soc Chemistry
Citation: Analyst. Royal Soc Chemistry, v. 141, p. 2767 - 2773, 2016.
Rights: fechado
Identifier DOI: 10.1039/c5an02333e
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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