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Electrospray characterization of perrhenate systems
F Sahureka1, R C Burns, E I von Nagy-Felsobuki
1School of Biological and Chemical Sciences, The University of Newcastle, Callaghan, New South Wales, Australia.
Journal of the American Society for Mass Spectrometry
|October 19, 2001
Summary
Electrospray negative ion mass spectrometry reveals that certain perrhenate ions, like [ReO2]- and [ReO3]-, are formed during collision-activated dissociation, not present in the bulk solution.
Area of Science:
- Analytical Chemistry
- Inorganic Chemistry
- Mass Spectrometry
Background:
- Perrhenate solutions are crucial in various chemical applications.
- Understanding ion formation in mass spectrometry is vital for accurate analysis.
- Electrospray ionization (ESI) is a common technique for analyzing ions in solution.
Purpose of the Study:
- To investigate the formation pathways of perrhenate ions using electrospray negative ion mode mass spectrometry.
- To elucidate the role of collision-activated dissociation (CAD) in generating specific perrhenate species.
- To differentiate between bulk solution species and those formed during the ionization process.
Main Methods:
- Electrospray negative ion mode (ESI-) mass spectrometry was employed.
- Studies were conducted on freshly prepared perrhenate in ammonium, sodium (Na), and potassium (K) solutions.
- Cone voltage dependency experiments were performed to analyze ion abundance and fragmentation.
Main Results:
- The abundance of negative ions showed clear linear and non-linear dependencies on cone voltage.
- Collision-activated dissociation (CAD) in the cone-to-skimmer region was identified as the source of these dependencies.
- [ReO2]- and [ReO3]- ions were found to be products of dissociative collisions, not bulk species.
- These ions result from the loss of a single oxygen atom from precursor ions [ReO3]- and [ReO4]- respectively.
Conclusions:
- The study clarifies that observed perrhenate ions ([ReO2]- and [ReO3]-) in ESI- spectra are artifacts of the ionization process, specifically CAD.
- This finding is critical for accurate interpretation of mass spectrometry data for perrhenate systems.
- The research provides insights into ion fragmentation mechanisms within the ESI source.