Chemistry and Physics Faculty Proceedings, Presentations, Speeches, Lectures
Development of Multistage Reactive Transmission Mode Desorption Electrospray Ionization Mass Spectrometry for characterizing complex catalytic reactions
Event Name/Location
American Chemical Society (ACS) 248th National Conference / San Francisco, CA, USA
Presentation Date
8-11-2014
Document Type
Conference Presentation
Description
Characterizing transient solution-phase intermediates of catalytic reactions at ambient conditions is a long-standing problem in analytical chemistry. Electrospray ionization mass spectrometry (ESI-MS) is well-established for studying reaction mechanisms in solution. Stopped- and continuous-flow ESI-MS can achieve time resolution in the millisecond (ms) regime (as low as ∼5-10 ms) but their complicated experimental configurations limit throughput and the scope of reactions available for study. In addition, these methods are prone to carryover effects, which can cause unwanted side reactions during analysis. Ambient mass spectrometry (MS) techniques such as reactive desorption electrospray ionization (rDESI) has resolved many of these problems, achieving reaction time resolution in the millisecond regime. Herein, we have successfully developed an ionization source based on transmission mode DESI (TM-DESI) called multi-stage reactive TM-DESI (rTMn-DESI, where n represents the number of desorption stages) that allows real-time capture of intermediates on submillisecond timescales. In addition, this technique allows control of the order in which reagents are introduced, providing the ability for step-wise elucidation of fast catalytic solution-phase processes and for minimizing unwanted degradation reactions. Using this technique, we characterize intermediates of various catalytic reactions such as C-H hydroxylation via high-valent iron oxo porphyrin complexes.
NSUWorks Citation
Perry, Richard H.; Peters, Kevin C.; Comi, Troy J.; and Parker, Kevin, "Development of Multistage Reactive Transmission Mode Desorption Electrospray Ionization Mass Spectrometry for characterizing complex catalytic reactions" (2014). Chemistry and Physics Faculty Proceedings, Presentations, Speeches, Lectures. 217.
https://nsuworks.nova.edu/cnso_chemphys_facpres/217
COinS
Comments
Invited Presentation
Monday, August 11, 2014 08:35 AM
Advances in Ionization Techniques and Mechanisms (08:30 AM - 11:55 AM)
Location: Moscone Center, North Bldg.
Room: 125