Characterization of fullerenes and fullerene derivatives by nanospray

Nanospray has been shown to be a viable ionization method for analysis of f ullerenes and fullerene derivatives by mass spectrometry. The sample quanti ties required have been comparable to those used for matrix-assisted laser desorption/ionization, which is currently considered to be amongst the most sensitive techniques. No modification of the fullerene sample solution was required. Neither protonation nor deprotonation were ever observed during nanospray of fullerenes, leading to the conclusion that an alternative to t he traditionally accepted ionization mechanism is required. The spectra wer e free of fragmentation, allowing the molecular ion to be identified beyond doubt. (C) 2000 Elsevier Science B.V. All rights reserved.