Journal
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Volume 12, Issue 4, Pages 381-384Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S1044-0305(01)00207-0
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Funding
- NCRR NIH HHS [P41RR00954] Funding Source: Medline
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We studied by tandem mass spectrometry two isomers of nitro meso-tetraphenylporphyrin, one with a nitro group in the pam position of a phenyl ring and the other with the same group in a beta -pyrrolic position, and their copper complexes. Collisional activation of the molecular ions of both free-base porphyrins and of their copper complexes produces an array of product ions that permit ready differentiation of the two positional isomers. The diagnostic ions, when the nitro group is in a beta -pyrrolic position, may be produced through intramolecular and double cyclization processes, triggered by the interaction of the nitro substituent with the neighboring meso-phenyl ring. These diagnostic ions do not form when the nitro group is in the para position. The gas-phase processes have precedents in solution chemistry. (C) 2001 American Society for Mass Spectrometry.
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