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Charge-remote fragmentation in dialkylaminostyryl dyes

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

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
238 KB
Volume
33
Category
Article
ISSN
1076-5174

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✦ Synopsis

Dialkylaminostyryl probes with two long alkyl chains were used to investigate the energetics of charge-remote fragmentation (CRF). These compounds provide high-quality liquid secondary ion (LSI) and electrospray ionization (ESI) mass spectra in which the intact cation predominates. The intact cation undergoes CRF in LSI but not in ESI, in which the cation is of lower internal energy. CRF is initiated in collision-induced dissociation (CID) and surface-induced dissociation (SID) for intact cations generated by either LSI or ESI. Single bond cleavage to lose one entire alkyl chain followed by CRF within the remaining alkyl chain seems to be the lowest energy CID and SID process.

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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