エレクトロスプレー液滴内のトリスビピリジンルテニウム(II)錯体のイオン会合(<特集>質量分析法の応用技術)

概要

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The relationship between the ion association equilibrium in solution phase and the ion intensity ratio in electrospray (ES) mass spectra was studied using tris (2,2'-bipyridine) ruthenium complex as a model solution. The ion concentration in solution was estimated from calculated ion association constants. The ion ratio of [Ru(bpy)_3ClO_4^+]/[Ru(bpy)_3^<2+>] as a function of counteranion concentration and dependence of counteranions on the ion ratio were measured in acetonitrile, acetone and methanol solution. The ion behavior in electrosprayed charged droplets was different from that in bulk solution. It was found that the ion ratio in the ES mass spectra was affected by both solvent concentration and ion evaporation rate of different charge states from charged droplets. The effect of different counteranions on the ion ratio showed that the ion association in the charged droplets was not explainable in terms of electrostatic interaction between counteranion and solvent.
社団法人日本分析化学会の論文
1996-06-05