I'm trying to understand if the counterion is detected as a distinct ion or if it tends to appear with the peak of the main molecule. The method used is ESI.
For example, what would the mass spectra of the compound below look like?
(What are other techniques that can be applied to characterize the counterion?)
Exact mass of imidazolium ion is 69.0447
Jürgen Weippert
For your reference, this supplement contains a substituted Imidazolium chloride's spectrum:
https://www.rsc.org/suppdata/c5/ra/c5ra17748k/c5ra17748k1.pdf
In ESI, you can tune settings, which includes varying the pH of the sprayed solution so that you can favor the formation of aggregated or isolated species in the gas phase. Therefore, species with or without counterions may be created.
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