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Probing the energetics of charge-remote fragmentation in carbocyanine dyes using collision- and surface-induced dissociation mass spectrometry

✍ Scribed by Melnyk, Michael C.; Carlson, Richard E.; Busch, Kenneth L.; Schey, Kevin L.; Bartlett, Michael G.

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 484 KB
Volume: 33
Category: Article
ISSN: 1076-5174
DOI: 10.1002/(sici)1096-9888(199801)33:1<75::aid-jms611>3.0.co;2-v

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✦ Synopsis

Carbocyanine dyes used as molecular probes are symmetric ring compounds with long alkyl chains on each ring proximate to a resonance-stabilized charge site. They provide high-quality positive-ion liquid second (LSI) and electrospray ionization mass spectra in which the intact cation is the dominant ion in the mass spectrum. The intact cation of a carbocyanine dye undergoes charge-remote fragmentation (CRF), evident in the LSI mass spectra. CRF is also observed in collision-induced dissociation and surface-induced dissociation of the mass-selected intact cation. Di †erential CRF processes from the two chains in the molecule are observed with increasing internal energy deposition.

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