Journal article
Unimolecular chemistry of doubly protonated zwitterionic clusters
EJH Yoo, L Feketeová, GN Khairallah, RAJ Ohair
Journal of Physical Chemistry A | AMER CHEMICAL SOC | Published : 2011
DOI: 10.1021/jp200921w
Abstract
Electrospray ionization and tandem mass spectrometry experiments have been used to study the fragmentation and electron-ion interactions of doubly charged zwitterionic clusters, [M15 + 2H]2+ (where M = Glycine Betaine (GB), (CH3)3N+CH2CO 2, and Dimethylsulfonioacetate (DMSA), (CH3) 2S+CH2CO2) which are close to the stability limit, i.e., the Coulomb repulsion of the charge within the cluster competes with attractive forces. The intercluster chemistry was studied using collision-induced dissociation (CID) and electron-induced dissociation (EID) in which the energy of the electrons has been varied from >0 to 30 eV. Experimental results suggest that the zwitterionic binding energy in the cluste..
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Funding Acknowledgements
We thank the ARC for financial support via the ARC Centre of Excellence for Free Radical Chemistry and Biotechnology. L.F. and G.N.K. thank the ARC for the award of an APD and an ARF, respectively. The authors gratefully acknowledge the generous allocation of computing time from the Victorian Partnership for Advanced Computing (VPAC) Facility. An ARC Lief grant and funding from the Victorian Institute for Chemical Sciences are acknowledged for the purchase of the LTQ-FT mass spectrometer. We would like to thank Dr. Bun Chan for valuable discussions.