The formation of resonance-stabilized sulfur-based radical cations and their gas-phase reactivity

A mass spectrometry and DFT study of pyrithione complexes with transition metals in the gas phase

“…Electrochemical reactions such as oxidation and reduction have previously been reported in ESI . For instance, in the case of 2‐mercaptopyridine, as well as for other aromatic and heterocyclic thiols, the oxidation of the analyte into a disulfide occurred easily after introduction to the ESI source of a quadrupole ion trap mass spectrometer . Presuming that the doubly charged metal adduct ions may contain as a ligand dipyrithione, an oxidation product of pyrithione, the mass spectra of solutions containing dipyrithione along with the different metal ions were examined (Figure ).…”

Gas-Phase Tyrosine-to-cysteine Radical Migration in Model Systems

“…This radical species was subsequently reacted with propyl thiol to yield HAT [equation 2 Although the rate constant was not measured, the reaction was kinetically fast compared to other HAT reactions under similar conditions. 45 DFT calculations show that this reaction is exothermic by ~30 kJ mol -1 (Figure 2). Similar reactivity is expected with the tyrosyl radical.…”

FT-ICR MS characterization of bio-binders for road pavement from HTL of microalgae residues

“…The M •+ radical cations (~20% of the total ion current) are mainly relative to aromatic and polyaromatic compounds for which the removal of an electron ensures the extension of the  conjugation domain and the stabilization of the ion. [50] The chemical formulae assigned to each detected signal revealed similarities between noncatalytic and catalytic biocrudes, whatever the ion detection mode. LDI-FT-ICR MS at 355 nm is known to be very efficient for the ionization of heteroaromatic compounds, in particular N containing molecules.…”