The gas-phase hydration of Mg complexes with deprotonated uracil (U), thymine (T), uridine (U , uracil riboside), and thymidine (T , thymine deoxyriboside) was studied. The aim of the work was to analyze the hydration of product ions (eg, [2U-H+Mg] ) formed as a result of the collision induced dissociation of the respective parent ion (eg, [3U -H+Mg] ). The efficiency of gas-phase hydration of the ions [2U-H+Mg] and [2T-H+Mg] was similar. However, the efficiency of gas-phase hydration of the ion [U+U -H+Mg] was much higher than that of gas-phase hydration of the ion [T+T -H+Mg] . On the basis of the mass spectra obtained and the performed molecular modelling, it was concluded that in the ion [T+T -H+Mg] , we deal with a steric hindrance due to the presence of a sugar moiety, which affects water attachment. In the ion [U+U -H+Mg] , the position of the sugar moiety does not affect water attachment.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/jms.4504 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Uncertainty Analysis of Biogas Generation and Gas Hydrate Accumulations in the Baiyun Sag, South China Sea.
Microorganisms
December 2024
Sanya Institute of South China Sea Geology, Guangzhou Marine Geological Survey, China Geological Survey, Sanya 572025, China.
In this study, we use petroleum systems modeling (PSM) to quantitatively simulate the uncertainty of biogenic gas generation modes and their impact on the spatial distribution and resource assessment of gas hydrates in the Baiyun Sag, South China Sea. The results are as follows: (1) Biogenic gas generation is significantly affected by thermal state and organic matter type. Low temperature is a primary reason for gas hydrate occurrence in shallower sediments when sufficient methane gas is present.
View Article and Find Full Text PDFModeling Local Aerosol Surface Environments: Clustering of Pyruvic Acid Analogs, Water, and Na, Cl Ions.
ACS Omega
January 2025
Department of Chemistry, Aarhus University, Langelandsgade 140, Aarhus C, Aarhus 8000, Denmark.
Pyruvic acid is an omnipresent compound in nature and is found both in the gas phase and in the particle phase of the atmosphere as well as in aqueous solution in the hydrosphere. Despite much literature on the photochemical degradation and stability of pyruvic acid in different chemical environments, the study of simultaneous interactions between gas-phase pyruvic acid or similar carboxylic acids with water and ions is not well-understood. Here, we present a study of microhydrated molecular clusters containing pyruvic acid and the structurally analogous carboxylic acids lactic acid, propionic acid, and 2,2-dihydroxypropanoic acid by probing geometries, binding free energies, hydrate distributions, as well as their infrared (IR) absorption spectra.
View Article and Find Full Text PDFStructures of Gas-Phase Hydrated Phosphotyrosine Revealed by Soft X-ray Action Spectroscopy.
Chemistry
January 2025
Deutsches Elektronen-Synchrotron DESY, 22603, Hamburg, Germany.
Gas-phase near-edge X-ray absorption mass spectrometry (NEXAMS) was employed at the carbon and oxygen K-edges to probe the influence of a single water molecule on the protonated phosphotyrosine molecule. The results of the photodissociation experiments revealed that the water molecule forms two bonds, with the phosphate group and another chemical group. By comparing the NEXAMS spectra at the carbon and oxygen K-edges with density functional theory calculations, we attributed the electronic transitions responsible for the observed resonances, especially the transitions due to the presence of the water molecule.
View Article and Find Full Text PDFUnbuckling the 18-Crown-6 Ether Belt Around Metal Ions: Forging the Connection to the Condensed Phase.
J Am Chem Soc
January 2025
Department of Chemistry, School of Science, Institute of Science Tokyo, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
Crown ethers are central to supramolecular chemistry, recognizing and binding specific ions in solution. The most well-known, 18-Crown-6 (18C6), preferentially captures K in an aqueous solution, while gas phase binding of 18C6 with alkali metal ions decreases linearly with an increasing ionic radius. Why the high affinity for Li and Na in the gas phase is dramatically reduced with hydration remains an open question in understanding the K selectivity in the aqueous phase.
View Article and Find Full Text PDFIon Chemistry in Dielectric Barrier Discharge Ionization: Recent Advances in Direct Gas Phase Analyses.
Mass Spectrom Rev
November 2024
J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Prague, Czechia.
Dielectric barrier discharge ionization (DBDI) sources, employing low-temperature plasma, have emerged as sensitive and efficient ionization tools with various atmospheric pressure ionization processes. In this review, we summarize a historical overview of the development of DBDI, highlighting key principles of gas-phase ion chemistry and the mechanisms underlying the ionization processes within the DBDI source. These processes start with the formation of reagent ions or metastable atoms from the discharge gas, which depends on the nature of the gas (helium, nitrogen, air) and on the presence of water vapor or other compounds or dopants.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!