Interactions of Glycerol with Water in the Gaseous State under Field Ionization Conditions

✍ Scribed by Marina V. Kosevich; Vadim S. Shelkovsky

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 443 KB
• Volume: 10
• Category: Article
• ISSN: 0951-4198
• DOI: 10.1002/(sici)1097-0231(19960315)10:4<435::aid-rcm458>3.0.co;2-a

✦ Synopsis

The possibility of the formation of water-glycerol clusters in the gas phase is studied in connection with an earlier observation of the absence of sputtering of such clusters under fast-atom bombardment (FAB) of frozen waterglycerol solutions. It is shown that, during interactions in the gas phase under field ionization mass spectrometric conditions, the formation of mono-and dihydrates of glycerol (G) is possible, which ultimately result in GH' and G -H,O -H+ ions in the mass spectra. The use of heavy water allows the observation of a comprehensive process of exchange of mobile hydrogens of glycerol with the deuterium of heavy water in the course of the interactions of the neutral molecules in the gas phase. The possibility of clustering of glycerol with water in admixture in the gas-phase under field ionization and the absence of this phenomenon in the case of condensed samples under FAB conditions confirms a suggestion about the mechanism of ion formation from frozen mixtures under lowtemperature FAB. This phenomenon consists in the separate sputtering of neat water and glycerol clusters from separate surface domains of different chemical composition, the domains being formed due to phase separation during the freezing of solutions.