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Imidazolium molecular motifs located on dicationic frameworks. Electrospray mass spectrometric observation of carbenes: imidazolylidenes
Author(s) -
Alcalde Ermitas,
Mesquida Neus,
Vilaseca Marta
Publication year - 2000
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/1097-0231(20000830)14:16<1443::aid-rcm43>3.0.co;2-h
Subject(s) - chemistry , electrospray ionization , deuterium , electrospray , molecule , carbene , hydrogen–deuterium exchange , mass spectrometry , ion , ionization , proton , mass spectrum , computational chemistry , analytical chemistry (journal) , stereochemistry , chromatography , organic chemistry , catalysis , physics , quantum mechanics
Electrospray ionization mass spectral analysis of simple dicationic imidazolium prototypes (M·2X) is reported and direct observation was obtained for proton‐mediated ion‐molecule reactions in the gas phase. The comparative ESI‐MS study with heterophanes 1a·2Cl and 3·2Br, the open chain system 5·2Br, and their regiospecific deuterated counterparts 2a·2Cl, 4·2Br and 6·2Br showed that the nature of the frameworks containing two imidazolium subunits modulates their electrospray ionization, changing the stability of the common characteristic peaks: the carbene specie [M − H] + or [M − D] + as well as [M] 2+ and [M · X] + .Copyright © 2000 John Wiley & Sons, Ltd.