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American Chemical Society, Journal of The American Society for Mass Spectrometry, 7(26), p. 1186-1190, 2015

DOI: 10.1007/s13361-015-1104-3

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Protonated Hexaazamacrocycles as Selective K+ Receptors

Journal article published in 2015 by Caterina Fraschetti ORCID, Antonello Filippi ORCID, Maria Elisa Crestoni ORCID, Enrico Marcantoni, Marco Glucini, Laura Guarcini, Maria Montagna, Leonardo Guidoni, Maurizio Speranza
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Protonated hexaazamacrocycle [M•H](+) is able to detect K(+) ions present at ppb level in methanolic solutions containing 10(-5) M of Na(+) ions. The high sensitivity and selectivity of [M•H](+) for K(+) is ascribed to the favorable energy balance between the K(+) ion desolvation and its coordination to the [M•H](+) macrocycle, which allows the formation of the corresponding adduct before the Coulombic explosion of the ESI-MS nanodroplets.