Publication
Title
Tandem mass spectrometry defines the stoichiometry and quaternary structural arrangement of tryptophan molecules in the multiprotein complex TRAP
Author
Abstract
Clathratelike structures of the alkali metal ions M+ = Li+, Na+, K+ Cs+, and ammonium with water molecules have been investigated with laser induced liquid beam ionization/desorption (LILBID) mass spectrometry. The LILBID process implies the desorption of ions from a thin jet of supercooled water in high vacuum by means of an IR laser pulse. Magic numbered water clusters are observed in the cation mass spectra of K+ and Cs+ halides, but not for Li+ and Na+. Predominant cluster sizes for K+ (H2O)n are n = 16, 20, 25, 27, and for Cs+(H2O)n, n = 18, 20, 22, 24, 27, 29, with the highest signal intensity for n = 20. Water clusters of this size correspond to deformed dodecahedral cage structures (clathrates) with a cation in the cavity, which are known to exist in the gas phase and in the solid state. The possible occurrence of clathratelike clusters in the liquid phase is discussed in the context of the physical chemistry of electrolyte solutions and the LILBID experiment.
Language
English
Source (journal)
Journal of the American Chemical Society. - Washington, D.C.
Publication
Washington, D.C. : 2004
ISSN
0002-7863
Volume/pages
126:19(2004), p. 5950-5951
ISI
000221416700011
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Publication type
Subject
External links
Web of Science
Record
Identification
Creation 30.06.2011
Last edited 19.09.2017