The elusive HNCOH+ ion characterized by a double‐collision experiment in the mass spectrometer Journal Articles uri icon

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abstract

  • AbstractPrevious studies have shown that the gas‐phase protonation of isocyanic acid, HNCO, exclusively yields the N‐protonated ion, the aminoformylium ion, H2NCO+, 1, which is thermodynamically the most stable [H2, C, N, O]isomer. In the present paper it is shown that the O‐protonated species, the elusive isoformylaminylium ion, HNCOH+, 2, can be generated by successive degradation of ionized N‐methyl‐O‐methylcarbamate in a 3‐stage tandem (MS/MS/MS) type experiment: CH3NHC(O)OCH· → CH3NHCOH+· → HNCOH+· The species is identified from its characteristic collisional activation (CA) mass spectrum. From a comparison of the CA mass spectra of the2H‐labelled isotopomers DNCOH+ and HNCOD+ with that of the isomeric ion HDNCO+ it follows that collisionally excited ions (>400 kJ/mol) of 2 may isomerize into 1.

publication date

  • February 1993