Abstract
High-resolution matrix-assisted laser desorption/ionization (MALDI) mass spectra of the title compounds were obtained using a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer. The results show that this technique is well suited for obtaining molecule ions of the title compounds. The main peaks in the spectra are due to the molecular ion, M+• and/or the protonated molecule, MH+. Little fragmentation is observed. Isotopic masses were measured for one of the compounds with an estimated accuracy of ± 5 ppm. In addition, experiments were performed with the neat compounds, without a matrix. This direct laser desorption method is useful in some cases, but is generally not applicable for these types of compounds, even when great care is exercised in controlling the laser pulse energy.
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