The fast atom bombardment (FAB) mass spectrometric analysis of several series of ruthenium-bidentate ligand complexes such as [RuLL′L″]X2, [RuL2L′]X2, and [RuL3]X2 are discussed, where L, L′, and L″ include 2,2′-bipyridine, 1,10-phenanthroline, their derivatives, and related compounds. Surprisingly abundant, intact, doubly charged cations [RuL3]2+, [RuLL′L″]2+, and [RuL2L′]2+ are observed for most complexes studied. Structurally significant fragment ions are generally observed for all complexes in addition to singly charged molecular cationic species such as [RuLL′L″]+ and [RuLL′L″]X+. The [RuLL′L″]2+/[RuLL′L″]+ ratio, where L = L′ = L″, L = L′ ≠ L″, or L ≠ L ≠ L″ depending on the series involved, varies from 3.5 to 0.35 over the 22 complexes studied. Reasons for the observation of these unique abundant doubly charged ions in a FAB spectrum, especially in a nitrobenzyl alcohol matrix, are discussed. Ions indicative of ligand exchange reactions between ruthenium centres are not observed for mixed ligand complexes.
|Number of pages||3|
|Publication status||Published - 1987|