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The peroxymonocarbonate anion, HCO4−, the covalent adduct between the carbon dioxide and hydrogen peroxide anion, effectively reacts with SO2 in the gas phase following three oxidative routes. Mass spectrometric and electronic structure calculations show that sulphur dioxide is oxidised through a common intermediate to the hydrogen sulphate anion, sulphur trioxide, and sulphur trioxide anion as primary products through formal HO2−, oxygen atom, and oxygen ion transfers. The hydrogen sulphite anion is also formed as a secondary product from the oxygen atom transfer path. The uncommon nucleophilic behaviour of HCO4− is disclosed by the Lewis acidic properties of SO2, an amphiphilic molecule that forms intermediates with characteristic and diagnostic geometries with peroxymonocarbonate. [ABSTRACT FROM AUTHOR]

This article, published in ChemPlusChem, discusses the use of electrospray ionization mass spectrometry (ESI-MS) to monitor the Knoevenagel condensation reaction catalyzed by carbon dots that are activated by UV light. The authors of the article focus on the role of the superoxide radical anion in the formation of the reaction product. The research article provides more in-depth details on this topic and is authored by Chiara Salvitti, Isabella Chiarotto, Anna Troiani, and their colleagues. [Extracted from the article]

Research has been conducted on the chemistry of atmospheres. The use of the mass spectrometry in investigating the neutral and ionic chemistry domain is discussed.

A study relating to research on the synthesis of various compounds of XeF2 with strong fluoride ion acceptors presents the results of an experimental and theoretical investigation of the structure of new Xe(II) species, namely, the XeNO3+ and XeNO2+ ions prepared for the first time ever in the gas phase. These synthesized ions were characterized by mass spectroscopic and theoretical techniques. Experimental methods and data are discussed.

A joint experimental/computational study was conducted relating to research on gas phase positive ion chemistry of nitric acid and related molecules within the context of atmospheric chemistry. The investigation focused on the positive ion chemistry of nitric acid derivative N2O5 and related species with particular attention being paid to their protonation and alkylation. Experimental methods and results are discussed.

The CS2O+ ion and CS2O molecule were prepared and structurally characterized by mass spectrometric techniques as isolated species in the gas phase. The theoretical analysis, performed by B3LYP and CCSD(T) computational methods, predicted different CS2O+ isomers, SSCO+, O(CS2)+, SCSO+, SCOS+ and S(COS)+, and structurally related singlet and triplet CS2O. Experiment and theory agree in identifying the obtained CS2O+ ions as a mixture of SCSO+ and SCOS+ isomers. CS2O neutral species, prepared by neutralization-reionization mass spectrometry, were directly characterized as intact, long-lived species with a lifetime τ>=2 μs. [ABSTRACT FROM AUTHOR]

The gaseous ionized carbonyl sulfide/ozone mixtures were studied by mass spectroscopic techniques and theoretical calculations. It revealed the operation of chain oligomerization reactions that lead to S(sub n+1)O(super +) and S(sub n+1)(super +) ions (n = 1-4).