Matrix-assisted laser desorption/ionization and Fourier transform ion cyclotron resonance mass spectrometry of metalloporphyrazines and metallophthalocyanines

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Eur. J. Mass Spectrom. 8, 35 - 39 (2002)

Matrix-assisted laser desorption/ionization and Fourier transform ion cyclotron resonance mass spectrometry of metalloporphyrazines and metallophthalocyanines

Eva Mørkved and Helge Kjøsen
Department of Chemistry, Norwegian University of Science and Technology, Sem Sælands vei 8, N-7491 Trondheim, Norway
John Vedde and Einar Uggerud^*
Department of Chemistry, University of Oslo, PO Box 1033, Blindern, N-0315 Oslo, Norway. E-mail:

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 ñ 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.

Keywords: matrix-assisted laser desorption/ionization, Fourier transform ion cyclotron resonance mass spectrometry, metalloporphyrins, metalloporphyrazines, metallophthalocyanines

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