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• W1991466466 abstract "Abstract Four C 3 ‐symmetrical tris(dipeptide) disks and their precursors were characterized using matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry (MALDI TOF MS). The C 3 ‐symmetrical disks were based on a benzene‐1,3,5‐triscarboxamide core extended by oligopeptides with trialkoxyanilide tails. The results indicate that MALDI TOF MS is a powerful and straightforward analytical technique for characterizing C 3 ‐symmetrical disks and their precursors. Clear (pseudo)‐molecular ion peaks could readily be identified. It is remarkable that strong radical ion signals were observed for all the compounds, including the anilines that were expected to be protonated prior to laser irradiation using acidic MALDI matrixes. Possible mechanisms for radical ion formation were investigated with the employment of radical scavengers, with various matrixes and with direct laser desorption/ionization (LDI). Most likely the radicals are formed by losing one electron from the aniline nitrogen and stabilized by conjugation through the phenyl ring. It appears that direct photo/thermal ionization of analytes is an important route for the radical ion formation of the compounds with trialkoxy aniline/anilide groups. Copyright © 2006 John Wiley & Sons, Ltd." @default.
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• W1991466466 date "2006-04-10" @default.
• W1991466466 modified "2023-10-15" @default.
• W1991466466 title "Radical cation formation in characterization of novelC3-symmetric disks and their precursors by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry" @default.
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• W1991466466 doi "https://doi.org/10.1002/jms.1025" @default.
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