Unimolecular reactivity upon collision of uracil–Ca2+ complexes in the gas phase: Comparison with uracil–M+ (M=H, alkali metals) and uracil–M2+ (M=Cu, Pb) systems

Abstract

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Large mixed complexes involving uracil, cytosine, thymine and/or 1‐methyl uracil around Ca2+ ions: an electrospray ionization/MS study

“…Under our experimental conditions, no smaller cluster than the cationized tetramer was observed. On the other hand, such complexes were observed under other experimental conditions …”

“…Because of the H‐bond donor and acceptor sites in combination with their simple structure, nucleobases can be considered as a perfect model to study noncovalent interactions. Indeed, in addition with H‐bonds, nucleobases can interact with cations to form ion–dipole complexes …”

“…For such an approach, a H atom may be replaced by a methyl group, thus selectively hindering the formation of interactions involving a specific atom. Some of these experimental investigations are completed by theoretical calculation to propose possible structures for the observed complexes . In addition to this useful methodology, here we propose to study the formation of cationized mixed complexes, B n B′ n ′ M 2+ , where B and B′ are two different types of nucleobases and M 2+ is a cation.…”

Gas‐Phase Interactions between Lead(II) Ions and Cytosine: Tandem Mass Spectrometry and Infrared Multiple‐Photon Dissociation Spectroscopy Study

“…The first one, already encountered with uracil, thymine, and 4-thiouracil, [10,11] corresponds to the formation of [Pb,N,C,O] + (m/z 250). [6,10,11,40,41] These two fragment ions further dissociate to generate the bare Pb + ion (m/z 208). [6,10,11,40,41] These two fragment ions further dissociate to generate the bare Pb + ion (m/z 208).…”

Specific coordination phenomena of alkaline earth metal ions with aromatic sulfonate ions in alcohols and binary solvents of acetonitrile–alcohols

“…the evaluation of major physicochemical properties of solution [1], mechanistic studies in organic chemistry and supramolecular chemistry [2], and the prediction of drug solubility and chemical stability in pharmaceutical sciences [3]. Recently, the coordination reactions of the alkali metal and alkaline earth metal ions have been extensively investigated, due to their widespread application in the industry, their importance in maintaining the ionic equilibrium of the human body and especially their relevance in pharmaceutics [4]. The mixtures of aqueous-organic or organic-organic mixed solvents find a broad application in industries such as the manufacture of paints to detergents and deodorants [5] and enable the variation of properties for studying the ion-ion and ion-solvent interactions [6].…”