Kosevich, Marina V. published the artcileIs there a ‘matrix suppression effect’ under fast-atom bombardment liquid secondary ion mass spectrometry of ionic surfactants in glycerol?, SDS of cas: 38146-42-8, the publication is Rapid Communications in Mass Spectrometry (2007), 21(4), 466-478, database is CAplus.
Some features of a ‘matrix suppression effect’ caused by ionic surface-active compounds under fast-atom bombardment (FAB) liquid secondary ion mass spectrometry (LSIMS) are being revised. It is shown that abundant transfer of the glycerol matrix mols. to the gas phase does occur under FAB-LSIMS of ionic surfactants, contrary to popular belief. This process can be obscure because of the dependence of the charge state of the glycerol-containing cluster ions on the type of ionic surfactant. It is revealed that, while glycerol matrix signals are really completely suppressed in the pos. ion mass spectra of cationic surfactants (decamethoxinum, aethonium), abundant deprotonated glycerol and glycerol-anion clusters are recorded in the neg. ion mode. In the case of an anionic surfactant (sodium dodecyl sulfate), on the contrary, glycerol is completely suppressed in the neg. ion mode, but is present in the protonated and cationized forms in the pos. ion mass spectra. It is suggested that such patterns of pos. and neg. ion FAB-LSIMS spectra of ionic surfactants solutions reflect the structure and composition of the elec. double layer formed at the vacuum-liquid interface by organic cations or anions and their counterions. Processes leading to the formation of the glycerol-containing ions preferentially of pos. or neg. charge are discussed. The most obvious of them is efficient binding of glycerol to inorganic counterions of the salts Cl– or Na+, which is confirmed by data from quantum chem. calculations The high content of the counterions and relatively small content of glycerol in the sputtered zone may be responsible for the charge-selective suppression of neat glycerol clusters of opposite charge to the counterions. In the case of a mixture of cationic and anionic surfactants the substitution of inorganic counterions by organic ones was observed The dependence of the exchange rate in the surface layer is not a linear function of the bulk solution concentration, and an effect of abrupt recharging of the surface can be registered. No both pos. or neg. charged pure glycerol and glycerol-inorganic counterion clusters are recorded for the mixture Correlations between the mass spectrometric observations and some phenomena of surface and colloid chem. and physics are discussed.
Rapid Communications in Mass Spectrometry published new progress about 38146-42-8. 38146-42-8 belongs to chlorides-buliding-blocks, auxiliary class Achiral Phase-Transfer Catalysts, name is N1,N10-Bis(2-((2-isopropyl-5-methylcyclohexyl)oxy)-2-oxoethyl)-N1,N1,N10,N10-tetramethyldecane-1,10-diaminium chloride, and the molecular formula is C38H74Cl2N2O4, SDS of cas: 38146-42-8.
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