Mass spectrometric studies of benzoxazine resorcarenes
| Autor: | Kari Rissanen, Kati Hakala, Jari M. J. Nuutinen, Thomas Straub, Pirjo Vainiotalo |
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| Rok vydání: | 2002 |
| Předmět: |
Spectrometry
Mass Electrospray Ionization Electrospray Chemistry Organic Chemistry Analytical chemistry Resorcinols Mass spectrometry Alkali metal Fourier transform ion cyclotron resonance Analytical Chemistry Ion Fragmentation (mass spectrometry) Spectrometry Mass Matrix-Assisted Laser Desorption-Ionization Reagent Oxazines Molecule Spectroscopy |
| Zdroj: | Rapid Communications in Mass Spectrometry. 16:1680-1685 |
| ISSN: | 1097-0231 0951-4198 |
| Popis: | Eleven differently substituted 3,4-dihydro-2H-1,3-benzoxazine resorcarenes were studied by electrospray ionisation (ESI) and matrix-assisted laser desorption/ionisation (MALDI) mass spectrometry, using Fourier transform ion cyclotron resonance (FT-ICR) and time-of-flight (TOF) mass spectrometers, respectively. Under ESI conditions it was possible to transfer the intact resorcarenes from solution to the gas phase, yielding [M + H]+ and [M + 2H]+ ions as the main ions observed. Energy increase of the ions induced ready decomposition through successive eliminations of four CH2NR groups. Ion-molecule reactions showed that the ionising proton was situated somewhere inside the molecule and could not be reached with neutral reagent gases. In the host-guest complexation experiments, the benzoxazine resorcarenes studied turned out to be poor hosts for alkali metal and ammonium ions. In MALDI experiments, 2,5-dihydroxybenzoic acid proved to be the best matrix for these compounds. However, the intensity of the [M + H]+ ions was low for all compounds, and extensive fragmentation with consecutive elimination of CH2NR groups was observed. Copyright © 2002 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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