Results 11 to 20 of about 169 (151)
“Anti-Electrostatic” Halogen Bonding [PDF]
Angewandte Chemie International Edition, 2020 Abstract Halogen bonding is often described as being driven predominantly by electrostatics, and thus adducts between anionic halogen bond (XB) donors (halogen‐based Lewis acids) and anions seem counterintuitive. Such “anti‐electrostatic” XBs have been predicted theoretically but for organic XB donors, there are currently no ...
Jana M. Holthoff +3 more
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Type II halogen···halogen contacts are halogen bonds [PDF]
IUCrJ, 2013 Cl/Br/I alternative substitutions in a series of dihalophenols indicate that type I and type II halogen···halogen contacts have different chemical nature. Only the latter ones qualify as true halogen bonds, according to the recent IUPAC definition.
METRANGOLO, PIERANGELO +1 more
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Cooperativity of halogen bonds – enhancing halogen-bond donating ability of halogenated pyridines through halogen bonding with N-haloimides [PDF]
Acta Crystallographica Section A Foundations and Advances, 2018 N-halogenated imides, common halogenating agents in organic synthesis, have recently been marked as extremely strong halogen donors. In previous studies we have demonstrated that N-halogenated succinimides form extremely short XBs with halogen bond energies between 20 and 60 kJ mol–1, depending on the pyridine basicity and the halogen atom. In light of
Stilinović, Vladimir, Cinčić, Dominik
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Intramolecular halogen–halogen bonds?
Physical Chemistry Chemical Physics, 2013 By analysing the properties of the electron density in the structurally simple perhalogenated ethanes, X3C-CY3 (X, Y = F, Cl), a previously overlooked non-covalent attraction between halogens attached to opposite carbon atoms is found. Quantum chemical calculations extrapolated towards the full solution of the Schrödinger equation reveal the complex ...
Johansson, Mikael P., Swart, Marcel
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Halogen bonding and chalcogen bonding mediated sensing
Chemical Science, 2022 Sigma–hole mediated detection of anions is rapidly emerging as a new paradigm in supramolecular sensor chemistry. Herein, we provide an overview of this field including halogen bonding and chalcogen bonding optical, electrochemical and other sensors.
Hein, R, Beer, PD
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π covalency in the halogen bond [PDF]
Nature Communications, 2020 AbstractHalogen bonds are a highly directional class of intermolecular interactions widely employed in chemistry and chemical biology. This linear interaction is commonly viewed to be analogous to the hydrogen bond because hydrogen bonding models also intuitively describe the σ-symmetric component of halogen bonding. The possibility of π-covalency in a
Cameron W. Kellett +2 more
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Halogen Bonding: An Odd Chemistry? [PDF]
The Chemical Record, 2021 AbstractHalogen bonding is a flourishing field of research, but has for long been little recognized. The same goes for its scientific hero, Odd Hassel, who laid the foundations for all current developments. The crystallographic observation of halogen−oxygen interatomic distances shorter than the sum of the van der Waals radii of the involved atoms, and
Turunen, Lotta +2 more
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Halogen Bonding in Crystal Engineering [PDF]
Acta Crystallographica Section A Foundations of Crystallography, 2005 The term halogen bonding encompasses any non-covalent interaction involving halogens as electrophilic species. High strength and directionality are the remarkable features of halogen bonding that fully justify its use as a primary intermolecular interaction to dictate molecular self-assembly processes.
METRANGOLO, PIERANGELO +3 more
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Transmembrane Halogen-Bonding Cascades
Journal of the American Chemical Society, 2013 Halogen bonds have recently been introduced as ideal to transport anions across lipid bilayer membranes. However, activities obtained with small transporters were not impressive, and cyclic arrays of strong halogen-bond donors above a calix[4]arene scaffold gave even weaker activities. Here, we report that their linear alignment for anion hopping along
Vargas Jentzsch Andreas, Matile Stefan
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Influence of an Argon/Silane Atmosphere on the Temperature of a Thermal Plasma
Advanced Engineering Materials, EarlyView.The influence of a silane‐doped argon atmosphere on the chemical composition and temperature of a thermal nontransferring argon plasma is investigated using optical emission spectroscopy. As a result of the high amount of free electrons resulting from the stepwise ionization and dissociation of the silane molecule, even a silane addition of 0.01 vol ...
Lena Kreie +4 more
wiley +1 more source