Results 61 to 70 of about 618 (167)
Carbon TrendsIn contrast to alternant, in non-alternant nanographenes (NGRs) and graphene nanoribbons (GNRs) no “sublattice structure” can be defined, associated with significant conceptual and computational simplifications. This leads to some fundamental differences
Aristides D. Zdetsis
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The Chemical Record, Volume 26, Issue 8, August 2026.This publication describes how R. B. Woodward and Roald Hoffmann crafted their masterpiece publications. Illustrations include Woodward's first draft of the famous “Violations There are none. Nor can violations be expected of so fundamental a principle of maximum bonding.” Original but discarded text shows the stepwise paths toward the W‐H masterpieces.
Jeffrey I. Seeman
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A Chiral Saddle‐Shaped Nanographene With Two Heptagon‐Embedded [4]Helicenes
Angewandte Chemie International Edition, Volume 65, Issue 31, 27 July 2026.We present a novel synthetic strategy toward a chiral saddle‐shaped nanographene (cSNG) via a two‐step oxidation of a prochiral anthracene precursor. The Scholl‐type oxidation first yields a key intermediate with sp3‐defect heptagons, and subsequent oxidative dehydrogenation affords fully conjugated cSNG.
Felix Trautner +11 more
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Molecules, 2018 With their versatile molecular topology and aromaticity, porphyrinoid systems combine remarkable chemistry with interesting photophysical properties and nonlinear optical properties.
Tatiana Woller +4 more
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, 2014 Citation: 'antiaromatic compounds' 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.A00382 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
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ChemistryCyclic π-conjugated organic species are classical examples of (anti)aromatic compounds. Two key features that characterize their (anti)aromatic behavior are the aromatic stabilization (or destabilization) energy and the degree of bond-length equalization
Miquel Solà, Luigi Cavallo
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Recent advances in antiaromatic metallacycles
Dalton TransactionsRecently, several antiaromatic metallacycles are reported, establishing a new area of (anti)aromaticity. Herein, we briefly review the syntheses and characterizations of these fascinating antiaromatic structures.
Lei Li, Yang Li, Wenfeng Jiang, Wei Bai
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Fully Conjugated Heteroatomic Non- and Quasi-Alternant Polyradicals
ChemistryIn this work, we present fully π-conjugated diradical(oid)s and tetraradical(oid)s with five-membered non-alternant cyclopentadienyl and quasi-alternant thiophene rings, the latter of which is used as a source of aromatic stabilization.
Sergi Betkhoshvili +3 more
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Nature CommunicationsThe structural motif of porphyrin is relevant for many essential biological processes and has emerged as a versatile component of functional materials. Here, we introduce a thiophene-based porphyrinogen having electron-deficient boron atoms in all four ...
Manuel Buckel +8 more
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Ultra-photostable small-molecule dyes facilitate near-infrared biophotonics
Nature CommunicationsLong-wavelength, near-infrared small-molecule dyes are attractive in biophotonics. Conventionally, they rely on expanded aromatic structures for redshift, which comes at the cost of application performance such as photostability, cell permeability, and ...
Kui Yan +8 more
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