Abstract
A number of mixed-valence complexes containing Ru III(NH 3) 4(X) X = NH 3, py) units cyano bridged to −Ru II(bpy) 2 or −Os II(bpy) 2 moieties have been examined by positive electrospray (ES) and Cs + fast ion bombardment (FAB) mass spectrometry. Both sets of data yielded a substantial [ M-PF 6] + signal and a number of characteristic fragment ions involving the multiple loss of the PF 6 − anion. ES data provided clear information on multiply charged ions as well as a strong indication of Ru-NH 3 bond weakening when Ru III(NH 3) 5 units are cyano bridged to Os II. The advantages of ES mass spectrometry for this class of compounds and the gas-phase redox chemistry of the investigated ions are discussed.
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