Results 181 to 190 of about 5,131 (236)
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Dual Chalcogen–Chalcogen Bonding Catalysis
Journal of the American Chemical Society, 2020The noncovalent S···O bonding interaction is an evolutionary force that has been smartly exploited by nature to modulate the conformational preferences of proteins. The employment of this type of weak noncovalent force to drive chemical reactions is promising yet remains largely elusive.
Wei Wang +6 more
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Resonance‐Assisted Intramolecular Chalcogen–Chalcogen Interactions?
Chemistry – A European Journal, 2003AbstractHigh‐level B3LYP/6‐311+G(3df,2p) density functional calculations have been carried out for a series of saturated chalcogenoaldehydes: CH(X)‐CH2‐CH2YH (X, Y=O, S, Se, Te). Our results indicate that in CH(X)‐CH2‐CH2YH (X=Y=O, S, Se) the XH⋅⋅⋅X intramolecular hydrogen bond (IHB) competes in strength with the X⋅⋅⋅XH chalcogen–chalcogen interaction,
Pablo, Sanz +2 more
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Chalcogen exchange in chalcogen–nitrogen π-heterocycles
Mendeleev Communications, 2021Abstract The procedures for synthesizing fused 1,2,5-chalcogenadi-azoles and 1,2,3-dithiazoles by direct exchange of one chalcogen atom for another, their scope and reaction pathways are discussed in this focus review.
Lidia S. Konstantinova, Oleg A. Rakitin
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Nanotube Formation Favored by Chalcogen−Chalcogen Interactions
Journal of the American Chemical Society, 2002Close contacts between sulfur, selenium, and tellurium centers are used to construct nanotubes in the solid state which are able to host other molecules.
Daniel B, Werz +2 more
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Chalcogen⋅⋅⋅π Bonding Catalysis
Angewandte Chemie, 2021AbstractWhile the presence of sulfur⋅⋅⋅π bonding interaction is a general phenomenon in the biological systems, the exploitation of this noncovalent force in a chemical process yet remains elusive. Herein, we describe the concept of chalcogen⋅⋅⋅π bonding catalysis that activates molecules of π systems through the interaction between chalcogen and π ...
Xiangjin Kong, Pan‐Pan Zhou, Yao Wang
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Chalcogen-containing and Chalcogen-functionalized Heterocycles
2023Heterocycles containing chalcogens as heteroatoms or embedded in several different functional groups founded interesting applications in medicinal chemistry, coordination chemistry, and materials. Recent development on their preparation is reported here.
Filipe Penteado, Eduardo. E. Alberto
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Physical Review B, 1988
The chalcogens S, Se, and Te have been introduced by diffusion into single-crystal germanium. Both thermal- and optical-junction space-charge techniques have been performed in parallel with photoconductivity studies using a Fourier-transform spectrometer. Electronic levels within the energy gap have been monitored from both valence and conduction bands
, Grimmeiss, , Montelius, , Larsson
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The chalcogens S, Se, and Te have been introduced by diffusion into single-crystal germanium. Both thermal- and optical-junction space-charge techniques have been performed in parallel with photoconductivity studies using a Fourier-transform spectrometer. Electronic levels within the energy gap have been monitored from both valence and conduction bands
, Grimmeiss, , Montelius, , Larsson
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Chalcogen-Bonding Supramolecular Polymers
The Journal of Organic Chemistry, 2020Exploring unknown supramolecular interacting forces to create novel supramolecular materials is an eternal theme of supramolecular science. Here, we first report a new family of supramolecular polymers formed by unconventional chalcogen-bonding interactions. A class of chalcogen-containing macrocyclic receptors, termed as chalcogena[4]arene (ChA[4], Ch
Rongjin Zeng, Zehao Gong, Qiang Yan
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Chalcogen Bonding: An Overview
Angewandte Chemie International Edition, 2018AbstractIn the last few decades, “unusual” noncovalent interactions like anion‐π and halogen bonding have emerged as interesting alternatives to the ubiquitous hydrogen bonding in many research areas. This is also true, to a somewhat lesser extent, for chalcogen bonding, the noncovalent interaction involving Lewis acidic chalcogen centers.
Lukas Vogel +2 more
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Ligand‐Stabilized Chalcogen Dications
Angewandte Chemie International Edition, 2009AbstractChalcogen‐transfer reagents? The bonding in the dicationic rings C2N2E2+ (see picture) differs from that in N‐heterocyclic carbenes and their isovalent p‐block analogues in accommodating a lone pair of electrons with π symmetry, as well as σ symmetry, on the chalcogen center. The labile electrophilic chalcogenium dications (E2+) are potentially
Tristram, Chivers, Jari, Konu
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