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Generation and dissociation of oxygen‐ and chloride‐bridged iron(III) and manganese(III) tetraphenylporphyrin dimer ions in the gas phase
Author(s) -
Gozet Tuba,
Huynh Lise,
Bohme Diethard K.
Publication year - 2010
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.1686
Subject(s) - chemistry , dimer , dissociation (chemistry) , ion , electrospray ionization , chloride , collision induced dissociation , mass spectrum , mass spectrometry , molecule , manganese , oxygen , inorganic chemistry , tandem mass spectrometry , organic chemistry , chromatography
Electrospray ionization mass spectrometry (ESI/MS) has allowed the discovery of novel dimer ions emerging from solutions of metalloporphyrin salts and their investigation by collision‐induced dissociation (CID) with N 2 molecules. ESI mass spectra have been recorded for the formation of the oxygen or chloride‐bridged dimer ions [(FeTPP) 2 OH] + , [(MnTPP) 2 OH] + , [(FeTPP) 2 Cl] + and [(MnTPP) 2 Cl] + derived from various solutions of FeTPPCl and MnTPPCl salts. The CID of [(FeTPP) 2 OH] + proceeds mainly by neutral loss of (FeTPP)OH to form [FeTPP] + and, to a minor extent, to form the charge‐reversed products. The CID of [(MnTPP) 2 OH] + exhibits exclusively the product ion [MnTPP] + by loss of neutral (MnTPP)OH. [(FeTPP) 2 Cl] + and [(MnTPP) 2 Cl] + dissociate by loss of (Fe/MnTPP)Cl to give rise to [Fe/MnTPP] + . [(FeTPP) 2 O] + and [(FeTPP) 2 OH] + were generated from a solution of the dimer, (FeTPP) 2 O. Dissociation of [(FeTPP) 2 O] + yields two product ions, [FeTPP] + and [(FeTPP)O] + , with higher onsets compared to the equivalent fragments formed from [(FeTPP) 2 OH] + . Copyright © 2009 John Wiley & Sons, Ltd.