Sensitivity of redox reactions of dyes to variations of conditions created in mass spectrometric experiments

Redox behaviour of four imidazophenazine dye derivatives under mass spectrometric conditions of matrix-assisted laser desorption/ionization (MALDI), laser desorption/ionization (LDI) from metal and graphite surface, electrospray, low temperature secondary ion mass spectrometry (LT SIMS) and fast ato...

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Bibliographic Details
Published in:Journal of mass spectrometry. 2008-10, Vol.43 (10), p.1402-1412
Main Authors: Kosevich, Marina V, Chagovets, Vitalij V, Shmigol, Irina V, Snegir, Sergej V, Boryak, Oleg A, Orlov, Vadim V, Shelkovsky, Vadim S, Pokrovskiy, Valerij A, Gomory, Agnes
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Chemistry
electron affinity
electrospray
Exact sciences and technology
imidazophenazine dyes
Ionization potentials, electron affinities, molecular core binding energy
LT SIMS
MALDI
Mass spectrometry
Molecular properties and interactions with photons
Organic chemistry
Physics
Properties of molecules and molecular ions
Reactivity and mechanisms
redox reactions
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Summary:Redox behaviour of four imidazophenazine dye derivatives under mass spectrometric conditions of matrix-assisted laser desorption/ionization (MALDI), laser desorption/ionization (LDI) from metal and graphite surface, electrospray, low temperature secondary ion mass spectrometry (LT SIMS) and fast atom bombardment (FAB) was studied and distinctions in the reduction-dependent spectral patterns were analyzed from the point of view of different quantities of protons and electrons available for reduction in different techniques. The reduction products [M + 2H]⁺ , [M + 3H]⁺ and M⁻ , [M + H]⁻ were observed in the positive and negative ion modes, respectively, which permitted to suggest independent occurrence of reduction and protonation/deprotonation processes. LDI from graphite substrate was the only technique that allowed us to obtain abundant negative ions of all dye derivatives. The yield of field ionization (FI) or field desorption (FD) mechanism to ion formation under LDI from rough graphite surface has been addressed. The sensitivity of reduction of the dyes to variation of reduction-initiating agents confirms high redox activity of the dyes essential for their functioning in natural and artificial systems. Copyright © 2008 John Wiley & Sons, Ltd.
ISSN:1076-5174
1096-9888
DOI:10.1002/jms.1421