Electrospray ionization collision induced dissociation of thiocarbocyanine and selenocarbocyanine dyes

The effect of the properties of sulphur and selenium atoms, the composition and location of substituents (―CH3, ―OCH3, ―C2H5, and ―C3H6―((N+Br−)C5H5)), and the charge state on the collision induced dissociation (CID) behaviour of ions generated by electrospray ionization (ESI) of thiocarbocyanine an...

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Bibliographic Details
Published in:Journal of mass spectrometry. 2019-07, Vol.54 (7), p.592-599
Main Authors: Kaczorowska, Małgorzata A., Jędrzejewska, Beata
Format: Article
Language:English
Subjects:
Bridges
collision induced dissociation
Dissociation
Dyes
electrospray ionization
Electrospraying
Ionization
Ions
Nitrogen atoms
Pyridinium
Selenium
Sulfur
Sulphur
thiocarbocyanine and selenocarbocyanine dyes
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Summary:The effect of the properties of sulphur and selenium atoms, the composition and location of substituents (―CH3, ―OCH3, ―C2H5, and ―C3H6―((N+Br−)C5H5)), and the charge state on the collision induced dissociation (CID) behaviour of ions generated by electrospray ionization (ESI) of thiocarbocyanine and selenocarbocyanine dyes have been investigated. The results show that, for of all the examined singly charged ions, the main dissociation channel was related to the formation of distonic ions, generated as a result of cleavages within the dimethine bridge. In the case of doubly charged ions (with propyl‐pyridinium substituents), competition between fragmentation processes related to charges located at different nitrogen atoms has been observed. The S/Se replacement also has an impact on the CID behaviour of the examined carbocyanine dyes. On the basis of the performed CID MS/MS experiments, general rules for the CID of thiocarbocyanine and selenocarbocyanine dyes have been proposed.
ISSN:1076-5174
1096-9888
DOI:10.1002/jms.4368