An electrospray ionization tandem mass spectrometric study of p-tert-butylcalix[6]arene complexation with ammonium hydroxide, and ammonium and sodium ions

Rapid Communications in Mass Spectrometry : RCM
André SassineMaria C F C Felinto

Abstract

The formation of complexes involving p-tert-butylcalix[6]arene with neutral and charged species has been investigated by tandem mass spectrometry combined with electrospray ionization. Complexes of p-tert-butylcalix[6]arene with NH4+ ions were observed in the ratios 1:1, 2:1, and 3:1, together with the complexes of p-tert-butylcalix[6]arene with NH4OH and Na+ ions in the ratios 1:1:1, 2:1:1, and 3:1:1. A single 1:1 complex of p-tert-butylcalix[6]arene with Na+ ions was observed. In addition, a doubly charged complex of p-tert-butylcalix[6]arene with NH4OH, Na+, and NH4+ ions in the ratio 6:1:1:1 was observed. The identity of each complex was determined by mass analysis of product ions formed by the application of a declustering potential over the range 20-220 V and by observation of product ion mass spectra wherein the collision energy was varied from 5 to 50 eV. Fragmentation of the complexes is characterized by the facile loss of the ammonia molecule, sodium and ammonium ions, loss of neutral p-tert-butylcalix[6]arene, and successive neutral losses of C4H8 from the six tert-butyl groups in each p-tert-butylcalix[6]arene molecule.

References

Apr 1, 1994·Journal of the American Society for Mass Spectrometry·C C LiouJ S Brodbelt

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Citations

Nov 12, 2013·Rapid Communications in Mass Spectrometry : RCM·Kerin E GregoryRoderick R Kunz
Mar 5, 2016·PLoS Computational Biology·André Schultz, Amina A Qutub
Oct 17, 2014·Critical Reviews in Microbiology·Narayanan KasinathanVenkata Rao Josyula

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