Reduction of cationic free-base <Emphasis Type="Italic">meso</Emphasis>-tris-<Emphasis Type="Italic">N</Emphasis>-methylpyridinium-4-yl porphyrins in positive mode electrospray ionization mass spectrometry |
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Authors: | Catarina I V Ramos M Graça Santana Marques A J Ferrer Correia Vanda Vaz Serra João P C Tomé Augusto C Tomé M Graça P M S Neves J A S Cavaleiro |
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Institution: | Mass Spectrometry Laboratory, Department of Chemistry, University of Aveiro, Campus de Santiago, Aveiro, Portugal. |
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Abstract: | Reductions involving more than one electron with formation of the M+ and M+2H]+ ions were observed for electrosprayed meso-tris(N-methylpyridinium-4-yl)porphyrin iodides, MI3. These reductions were studied by using different solvents and flow rates. Formation of the M+2H]+ ions occurred only for protic solvents and to a larger extent at lower flow rates. The type of the fourth substituent does
not seem to affect the reduction processes. Formation of the two reduced species, M+ and M+2H]+ ions, may occur through the participation of counter ion/solvent clusters. Reduction of multiply charged, non-metallated
species with formation of M+nH]+ ions (n>1) was not observed before in positive mode electrospray mass spectrometry. |
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