The electrospray ionisation mass spectra (EDESI-MS) of Ru6C(CO)16(PPh3) and Ir4(CO)11(PR3) (PR3=PPh3, P(p-C6H4OMe)3, P(p-C6H4NMe2)3, P(p-C6H4Cl)3, P(OPh)3, P(OMe)3, PO3C5H9) are described and the relative importance of carbonyl loss versus phosphine loss as a fragmentation pathway is assessed. Qualitatively, the phosphine ligands bind more strongly to Ir4(CO)11 clusters than to Ru6C(CO)16. The influence on the collision cell pressure on MS/MS spectra of transition metal carbonyl cluster anions is also explored showing that a greater, simultaneous, distribution of fragment ions is produced as the collision cell pressure is increased.
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Acknowledgments
We thank Prof. R. Roulet (EPFL) for donating the tetrairidium clusters. Colin Butcher is thanked for collecting some of the PDESI data. JSM thanks Natural Sciences and Engineering Research Council of Canada, the Canada Foundation for Innovation and the British Columbia Knowledge Development Fund for instrumentation and operational funding. SK thanks NSERC for a University Summer Research Fellowship.
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Dedicated to Prof. Brian F. G. Johnson on the occasion of his retirement.
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Crawford, E., Dyson, P.J., Forest, O. et al. Energy-dependent Electrospray Ionisation Mass Spectrometry of Carbonyl Clusters. J Clust Sci 17, 47–63 (2006). https://doi.org/10.1007/s10876-005-0043-8
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DOI: https://doi.org/10.1007/s10876-005-0043-8