Secondary ion mass spectra of organic cationic dyestuffs

Rules for the behavior under fast atom bombardment (FAB) have been established for 15 cationic dyes — quaternary ammonium salts of heterocyclic amines and heterocycles containing quaternary nitrogen atoms with aliphatic substituents. Intense peaks corresponding to the molecular mass of the cationic part of the dyes [M-Hal]⁺ are observed in the spectra of all the derivatives. Fragmentation of the azodyes is determined by the azo group and the heterocyle. The base peaks in the case of compounds containing a quaternary nitrogen atom with aliphatic substituents correspond to the ammonium ion and a fragment of amine type. The results obtained can be used to identify dyes of unknown structure from their secondary ion mass spectra (SIMS).DeceasedTranslated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, 1411–1417, October, 1992