Nonclassical ammonium ions as intermediates in cinchona alkaloid rearrangements?
Sign Up to like & getrecommendations! Published in 2020 at "Chirality"
DOI: 10.1002/chir.23188
Abstract: The classical/nonclassical nature of cationic ammonium intermediates proposed to be involved in cinchona alkaloid solvolysis and related reactions is investigated. While these intermediates are found to possess highly distorted geometries in which the central nitrogen… read more here.
Keywords: ammonium ions; cinchona alkaloid; nonclassical ammonium; ammonium ... See more keywords
Direct Detection of Bound Ammonium Ions in the Selectivity Filter of Ion Channels by Solid-State NMR
Sign Up to like & getrecommendations! Published in 2022 at "Journal of the American Chemical Society"
DOI: 10.1021/jacs.1c13247
Abstract: The flow of ions across cell membranes facilitated by ion channels is an important function for all living cells. Despite the huge amount of structural data provided by crystallography, elucidating the exact interactions between the… read more here.
Keywords: selectivity filter; selectivity; ion channels; ammonium ions ... See more keywords
Rotational isomerism of the amide units in rotaxanes based on a cyclic tetraamide and secondary ammonium ions
Sign Up to like & getrecommendations! Published in 2019 at "Organic Chemistry Frontiers"
DOI: 10.1039/c9qo00096h
Abstract: We describe the synthesis of [2]rotaxanes consisting of a macrocyclic tetraamide and mono- and bis-ammonium ions and their conformational isomerism. read more here.
Keywords: ammonium ions; isomerism amide; ammonium; rotational isomerism ... See more keywords
Electrochemical sensing mechanism of ammonium ions over an Ag/TiO2 composite electrode modified by hematite.
Sign Up to like & getrecommendations! Published in 2023 at "Chemical communications"
DOI: 10.1039/d3cc00240c
Abstract: Here, we demonstrate a new electrochemical sensing mechanism of ammonium ions (NH4+) involving a two-electron oxygen reduction reaction (ORR) and a hydrazine reaction. The NH4+ are electrooxidized to hydrazine by H2O2 derived from the ORR… read more here.
Keywords: composite electrode; mechanism; sensing mechanism; electrochemical sensing ... See more keywords
Role of ammonium ions on the stability of TiO2 sol
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Dispersion Science and Technology"
DOI: 10.1080/01932691.2018.1472002
Abstract: Abstract In this paper, the role of the trace ammonium ions on the stability of TiO2 sol prepared by peroxo titanic acid (PTA) sol was investigated. The results showed that the removal of ammonium ions… read more here.
Keywords: tio2 sol; ammonium ions; ions stability;
Influence of nucleotide modifications at the C2’ position on the Hoogsteen base-paired parallel-stranded duplex of poly(A) RNA
Sign Up to like & getrecommendations! Published in 2017 at "Nucleic Acids Research"
DOI: 10.1093/nar/gkx713
Abstract: Abstract Polyadenylate (poly(A)) has the ability to form a parallel duplex with Hoogsteen adenine:adenine base pairs at low pH or in the presence of ammonium ions. In order to evaluate the potential of this structural… read more here.
Keywords: ammonium ions; base; deoxy fluoro; poly ... See more keywords