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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Published online February 12, 2007
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Ramos, C.I.V., Marques, M.G.S., Correia, A.J.F. et al. Reduction of cationic free-base meso-tris-N-methylpyridinium-4-yl porphyrins in positive mode electrospray ionization mass spectrometry. J Am Soc Mass Spectrom 18, 762–768 (2007). https://doi.org/10.1016/j.jasms.2006.12.009
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DOI: https://doi.org/10.1016/j.jasms.2006.12.009