Abstract

Tetraphenyl iron(III) and manganese(III) porphyrin chloride (FeTPPCl and MnTPPCl) are studied by electrospray ionization tandem mass spectrometry (ESI/MS/MS). Removal of the chloride counter ion from these salts results in intense [FeTPP] + and [MnTPP] + ions that lose hydrogen and peripheral phenyl rings upon multi-collision-induced dissociation (CID). Dissociation pathways are probed as a function of collision-offset voltage with onset measurements. Onset voltages generally are higher for [MnTPP] +. While primary losses of benzene, biphenyl and hydrogen occur concomitantly at low collision voltages, losses of hydrogen from the secondary and higher-order ions occur at higher collision voltages. Comparisons are made with previous measurements using surface-induced dissociation, photodissociation and electron impact.

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