| Affiliation: | (1) Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, V8W 3V6, Canada;(2) Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland |
| Abstract: | 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.Dedicated to Prof. Brian F. G. Johnson on the occasion of his retirement. |
