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Eur. J. Mass Spectrom. 3, 427 - 438 (1997)

Analysis of ruthenium carbonyl:porphyrin complexes: a comparison of matrix-assisted laser desorption/ionisation time-of-flight, fast-atom bombardment and field desorption mass spectrometry

Matthias Frauenkron, Albrecht Berkessel and Jürgen H. Gross
Organisch-Chemisches Institut der Universität, Im Neuenheimer Feld 270, 69120 Heidelberg, .

ABSTRACT:
The mass spectrometric characterisation of ruthenium carbonylporphyrin complexes and the corresponding porphyrins is described. Matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF-MS), fast-atom bombardment mass spectrometry (FAB-MS), in both low-resolution (LR) and high-resolution (HR) modes, and field desorption mass spectrometry (FD-MS) have been used and compared in detail. MALDI-TOF-MS turned out to be ideal for rapid screening of potential synthetic pathways. FAB-MS proved to be especially useful in establishing elemental compositions by HR measurement. Whereas the porphyrins gave very good molecular ion intensities, the ruthenium carbonyl complexes exhibited abundant carbon monoxide (CO) loss in MALDI-TOF-MS and still a measurable CO loss in FAB-MS. Only FD-MS yielded the molecular ion as the base peak of the spectrum in all cases. Optimised FD emitter heating conditions allow the remaining portion of the thermally-induced CO loss to be significantly reduced.

Keywords: Porphyrins, ruthenium carbonyl, porphyrin complexes, matrix-assisted laser desorption/ionisation, fast atom bombardment, field desorption.

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