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Electrospray mass spectrometry on a magnetic sector instrument applied to heteropolyacids
Author(s) -
Tuoi Jérémie Le Quan,
Muller Etienne
Publication year - 1994
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290080905
Subject(s) - chemistry , mass spectrometry , electrospray ionization , electrospray , ion , acetonitrile , analytical chemistry (journal) , mass spectrum , ionic bonding , chromatography , organic chemistry
Electrospray mass spectrometry has been applied to ionic inorganic systems such as heteropolyacids in methanol + water (1/1) or acetonitrile + water (1/1) solutions. Negative‐ion mass spectra were obtained on four different heteropolyacids. Heteropolymolybdates H 3 PMo 12 O 40 and H 4 PMo 11 VO 40 and heteropolytungstates H 3 PW 12 O 40 and H 4 SiW 12 O 40 gave ions with different charges. H 3 PMo 12 O 40 gave ions of m/z 1822, 912 and 608 which correspond respectively to [PMo 12 O 40 3−+ 2H + ], [PMo 12 O 40 3−+ H + ] 2− and [PMo 12 O 40 ] 3− ions. Resolution of 1:2200 has demonstrated the charge of each ion acquired. Furthermore, the isotope distribution of the observed ions was in good agreement with theory. Thus, electrospray mass spectrometry has become a powerful soft ionization technique for the analysis of such ionic compounds, provided they are soluble and stable in the solvent system used.