Publication Type Journal Article
Title Reduction of cationic free-base meso-tris-N-methylpyridinium-4-yl porphyrins in positive mode electrospray ionization mass spectrometry
Authors Catarina I. V. Ramos M. Graca Santana Marques A. J. Ferrer Correia Vanda Vaz Serra João P. C. Tomé Augusto C. Tome M. Graca P. M. S. Neves J. A. S. Cavaleiro
Groups
Journal JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Year 2007
Month April
Volume 18
Number 4
Pages 762-768
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.
DOI http://dx.doi.org/10.1016/j.jasms.2006.12.009
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Publisher
Book Title
ISSN 1044-0305
EISSN
Conference Name
Bibtex ID ISI:000245540800018
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