Efficient clustering of cyclic sulfonium salts applying liquid secondary ion mass spectrometry

Eur. J. Mass Spectrom. 12, 31–36 (2006)
DOI: 10.1255/ejms.789

Efficient clustering of cyclic sulfonium salts applying liquid secondary ion mass spectrometry

Rosaria Cozzolino, Richard T. Gallagher and Thomas Drewello^*
Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK

ABSTRACT:

Salt-like cluster ions of the ([cation]_n[anion]_n–1)⁺ type are commonly composed of mono-atomic, inorganic components. Clusters containing organic ions are also known, with nitrogen-centred cations being particularly prominent. However, sulphur-centred analogues, such as organic sulphonium salts, represent a notable exception. Fast atom bombardment and liquid secondary ion mass spectrometry of such compounds show, in general, a low tendency towards the formation of clusters. The present study reveals that sputtering of cyclic sulphonium salts leads to the efficient formation of cluster ions beyond previous observations. Cluster ions are characterised by isotopic pattern analysis and collision-induced dissociation.

Keywords: cyclic sulfonium salt clusters, sulfonium ion, cluster formation, liquid-secondary ion mass spectrometry

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