CHARACTERIZATION OF RUTHENIUM CLUSTERS CARRYING FACIAL ARENE LIGANDS USING ULTRAVIOLET-LASER DESORPTION MASS-SPECTROMETRY - AGGREGATION OF GAS-PHASE MONOCHARGED ANIONIC CLUSTERS FROM NEUTRAL MOLECULAR CLUSTERS

The ultraviolet laser desorption mass spectra of [Ru-4(CO)(9){eta(3)-eta(2):eta(2):eta(2)-C6H4(eta(2)-CMeCH(2))(2)-1,3}] and [Ru6C(CO)14(mu(3)-eta(2):eta(2): eta(2)-C16H16)] show abundant singly-charged negative ions; peaks corresponding to successive loss of carbonyl ligands from an otherwise intact parent cluster along with a remarkable series of higher mass species formed in the source region of the mass spectrometer are seen.