Liquid Ionization Mass Spectrometry of Some Triorganotin Carboxylates

Abstract

The liquid ionization (LPI) mass spectra of the triorganotin carboxylates were described and compared with those obtained by other methods such as EI, FAB and ESI, in which [M + H]⁺ were not observed or the spectra were complicated. The liquid ionization mass spectra of triorganotin carboxylates varied with solvents and sample concentrations. For instance, the fragment ions [M + (C₄H₉)₃Sn]⁺ of dimeric ions were observed with chloroform used as a solvent, while the [M + H]⁺ were observed as the base peak using ethylene dichloride. Spectra useful for the differentiation of isomers [C₈H₇O₃Sn(C₄H₉)₃] were obtained by the formation of characteristic adduct ions, such as [M + EA + H]⁺ and [M + 2EA + H]⁺, with a reagent like 2-aminoethanol. Collision-induced dissociation (CID) spectra observed by ESI and LPI mass spectrometry were similar and provided less information than adduct ions did.