Results 81 to 90 of about 5,976 (269)
Electron, EarlyView.A series of BN‐azepines with a twisted heptagonal B–N donor–acceptor framework was synthesized, enabling stable photoinduced radicals in solution. Upon photoexcitation, charge separation between the triarylamine donor and boron acceptor yields a longer‐lived triplet state, which can generate a nitrogen radical cation through electron transfer.
Lingjuan Chen +3 more
wiley +1 more source
Chemistry – A European Journal, Volume 32, Issue 17, 5 May 2026.In this work, the synthesis and characterization of novel π‐extended phenazine diimides is reported. The derivatives undergo differential reduction to a dihydrophenazine or Meisenheimer form depending on the reaction conditions employed. The outcome of this work highlights the paramount importance of structural design in determining the nature of the ...
Francesco Rigodanza +7 more
wiley +1 more source
How does excited-state antiaromaticity affect the acidity strengths of photoacids?
Chemical Communications, 2020 Photoacids like substituted naphthalenes (X = OH, NH3+, COOH) are aromatic in the S0 state and antiaromatic in the S1 state. Nucleus independent chemical shifts analyses reveal that deprotonation relieves antiaromaticity in the excited conjugate base ...
Zhili Wen, L. Karas, Chia-Hua Wu, J. Wu
semanticscholar +1 more source
Chain Versus Ring: Characterization of a Meta‐Phenylene Ladder Polymer and Its Octameric Macrocycle
Chemistry – A European Journal, Volume 32, Issue 16, 25 April 2026.The synthesis and comprehensive spectral and photophysical analysis of a methyl‐substituted ladder meta‐phenylene macrocycle (MeLMMP) and its polymer analogue (MeLPMP) show that, despite differing topologies (macrocycle vs. polymer), both display nearly identical electronic and photophysical properties due to cross‐conjugation.
Paulo D. Nunes Barradas +4 more
wiley +1 more source
Isolation of an Antiaromatic 9‐Hydroxy Fluorenyl Cation [PDF]
, 2021 Daniel Duvinage +2 more
openalex +1 more source
Journal of the American Chemical Society, 2019 Solution-phase synthesis of buckybowls remains a big challenge, and there are limited reports on the fragments of C70. Herein, we report a new basic subunit of C70 with C2v symmetry, the dicyclopenta[4,3,2,1- ghi:4',3',2',1'- pqr]perylene (2CP-Per).
Ya Zou +5 more
semanticscholar +1 more source
, 2008 Citation: 'antiaromaticity' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.AT06987 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire +1 more source
Chemistry – A European Journal, Volume 32, Issue 15, 22 April 2026.ABSTRACT Molecules that violate Hund's rule by exhibiting an inverted singlet–triplet gap (STG), where the first excited singlet (S1${\rm S}_1$) lies below the triplet (T1${\rm T}_1$), are rare but hold great promise as efficient fifth‐generation light emitters.
Atreyee Majumdar +1 more
wiley +1 more source
Storing the wisdom: chemical concepts and chemoinformatics [PDF]
, 2018 The purpose of the paper is to examine the nature of chemical concepts, and the ways in which they are applied in chemoinformatics systems. An account of concepts in philosophy and in the information sciences leads to an analysis of chemical concepts ...
David Bawden
core +1 more source
Highly Electron‐Donating Antiaromatic N,N′‐Dimethyldiazaporphyrins via Reductive Dimethylation
ChemistryEuropeNi(II) N,N′‐dimethyl‐5,15‐diazaporhyrins are efficiently prepared through reductive dimethylation of 5,15‐diazaporphyrin Ni(II) complexes with sodium dispersion in the presence of dimethyl sulfate.
Kohei Ohtake +2 more
doaj +1 more source