Results 71 to 80 of about 22,715 (251)
Chemistry – A European Journal, EarlyView.A unimolecular polyampholytic graft copolymer matrix provides a protective confinement for an electrostatically embedded tetrapyridophenazine‐bridged heterodinuclear Ru‐Pt hydrogen evolving photocatalyst. The matrix slows the degradation kinetics of the catalyst and at the same time does not hinder its repair by ammonium persulfate.
Yurii Utievskyi +10 more
wiley +1 more source
Iso‐Tellurazole N‐Oxides Assemble Adaptively Folded Macrocyclic Dodecamers
Chemistry – A European Journal, EarlyView.Te…O Chalcogen bonding links twelve molecules into a ring that wraps itself around molecular guests. ABSTRACT Self‐assembled macrocyclic dodecamers were found in the crystals of new pseudo‐polymorphs of iso‐tellurazole N‐oxides. These structures are formed by molecules connected by NTe…O chalcogen bonds and are folded in a pattern that defines 89–153 ...
Jin Z. Wang +4 more
wiley +1 more source
Photoelectron spectroscopy of pyrazine anion clusters
, 2018 We studied the energetics and character of electron binding in the pyrazine anion clusters by mass spectrometry, photoelectron spectroscopy, and theoretical calculations. The mass distribution showed that the minimum number of molecules in a neat cluster
Song, JK, Lee, NK, Kim, SK
core +1 more source
Chemistry – A European Journal, EarlyView.Understanding aromaticity has evolved from benzene‐centric concepts to a broad multidimensional framework spanning organic, inorganic, and excited‐state systems. This review highlights ambiguities between magnetic, electronic, geometric, and energetic descriptors, emphasizing the need for unified, multi‐criteria approaches.
Sílvia Escayola +2 more
wiley +1 more source
Coordination-Driven Direct C─H Metalation of N-Heterocycles With a Superbasic Co(II) Amide Co(TMP)<sub>2</sub>. [PDF]
Angew Chem Int Ed EnglBy enabling regioselectivities that are inaccessible with conventional bases, this study introduces a Co(II) amide platform for the deprotonative C─H metalation of sensitive N‐heterocycles. Subsequent interception of the resulting Co(II) intermediates with external oxidants affords a family of sterically congested, TMP‐substituted heterocycles via C─N ...
Jin N, Mu M, García-Melchor M, Hevia E.
europepmc +2 more sources
Nitrogen‐Site Isomerism Unlocks Exciton Dissociation in Vinylene‐Linked COF‐Based Photocatalysts
EcoEnergy, EarlyView.Two regioisomeric vinylene‐linked covalent organic frameworks (COFs) constructed from diazine units with different nitrogen positions are developed for photocatalytic hydrogen evolution reaction (HER). Although structurally similar, the isomeric COFs exhibit distinct electron distribution and charge‐separation behaviors, leading to a more than twofold ...
Ming Wang +10 more
wiley +1 more source
Food Chemistry International, EarlyView.This study compares oxidative stability, fatty acid profiles, volatile compounds, and sensory attributes of four Xinjiang seed oils. Distinct aldehyde‐driven aroma patterns and compositional differences were revealed, providing a scientific basis for quality evaluation and valorization of underutilized plant seed oils in food applications.
Yilai Wan +4 more
wiley +1 more source
Pyrazine Analogues of Dipyrrolylquinoxalines
, 2016 The synthesis of novel pyrazine derivatives bearing pyrrolic substituents is reported; the ability of these systems to bind certain biologically relevant anions in dichloromethane is also ...
Evgeny Katayev (2673769) +3 more
core +2 more sources
Crystal structure of 2,3,5,6-tetrakis[(methylsulfanyl)methyl]pyrazine
Acta Crystallographica Section E, 2014 The title compound, C12H20N2S4, synthesized by the reaction of 2,3,5,6-tetrakis(bromomethyl)pyrazine with sodium methanethiolate, crystallizes with a half -molecule in the asymmetric unit.
Tokouré Assoumatine +1 more
doaj +1 more source
FlexMat, EarlyView.An orthogonal spirobifluorene‐fusion strategy is introduced for B/N/O‐alternated MR frameworks, enabling improved kRISC (5.46 × 103 s−1), high ΦPL (97%), and narrow‐band pure‐red emission. Vacuum‐evaporated OLEDs incorporating this emitter achieve an EQEmax >40% (FWHM = 36 nm) and exhibit exceptionally low efficiency roll‐off at high luminance ...
Yan‐Yun Jing +7 more
wiley +1 more source