Reduction of cationic free-base meso-tris-N-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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Affiliation: | 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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