Structural characterization of organic molecules by negative ions in laser microprobe mass spectrometry. Part 2—Salts

✍ Scribed by L. Van Vaeck; J. Bennett; P. van Espen; E. Schweikert; R. Gijbels; F. Adams; W. Lauwers

• Publisher: John Wiley and Sons
• Year: 1989
• Tongue: English
• Weight: 791 KB
• Volume: 24
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210240913

✦ Synopsis

Laser microprobe mass spectrometry (LMMS) has been applied systematically to a variety of organic polyfunctional molecules, covering a wide range of structures and polarities. The microprobe generally offers a combination of desorption under relatively mild conditions with abundant fragmentation. We attempted an empirical approach by tentative hypotheses about desorption and ionization in LMMS to consistently rationalize the detected fragments. The complementary nature of structural data, carried by positive and negative ions, is characteristic for LMMS results of non-ionic compounds. The analysis of salts represents, traditionally, an ultimate test case for soft methods in organic mass spectrometry. Hence, by a selected series of compounds, we have tried to assess to which extent the presence of preformed ions becomes an asset for LMMS analysis and affects the amount, the accessibility or the distribution of organic information between positive and negative fragments.