Results 51 to 60 of about 1,579 (190)
Aromaticity and Antiaromaticity in the Excited States of Porphyrin Nanorings [PDF]
, 2019 Aromaticity can be a useful concept for predicting the behavior of excited states. Here we show that π-conjugated porphyrin nanorings exhibit size-dependent excited-state global aromaticity and antiaromaticity, for rings containing up to eight porphyrin ...
Takayuki, Kobatake +6 more
core +2 more sources
Angewandte Chemie, Volume 138, Issue 40, 28 September 2026.We demonstrate the facile aromatic C─C bond cleavage of cyclopentadienide mediated by transient imino(metallophosphino)silylenes, enabling the transformation of an aromatic system into a homoaromatic species. The steric bulk of the phosphino substituent, together with the weak interaction between the coinage metal and the cyclopentadienide ligand, are ...
Huaiyuan Zhu +4 more
wiley +2 more sources
Evaluation of the aromatic character of some bowl shape polycyclic carbon nanostructures [PDF]
شیمی کاربردی روز, 2017 In two recent decades, nucleus independent chemical shift (NICS) criterion was used to gauge the amount of aromaticity of organic and inorganic compounds in a lot of publications.
Adel Reisi-Vanani, fatemeh hajizadeh
doaj +1 more source
A QCT View of the Interplay between Hydrogen Bonds and Aromaticity in Small CHON Derivatives
Molecules, 2022 The somewhat elusive concept of aromaticity plays an undeniable role in the chemical narrative, often being considered the principal cause of the unusual properties and stability exhibited by certain π skeletons. More recently, the concept of aromaticity
Miguel Gallegos +4 more
doaj +1 more source
Contemplation on some cyclic N8 isomers-A DFT treatment
Defence Technology, 2018 Various cyclic N8 isomers are considered at the levels of B3LYP/6–311++G(d,p) and B3LYP/cPVTZ. Some energies and molecular orbital properties are obtained. The structures are found to be stable in the singlet state but mostly unstable in the triplet. The
Lemi Türker
doaj +1 more source
Divergent Synthesis of Möbius and Hückel N‐Heterocycloarenes From a Common Macrocyclic Backbone
Angewandte Chemie, Volume 138, Issue 37, 7 September 2026.In the divergent synthesis of Möbius and Hückel N‐heterocycloarenes from a common macrocyclic precursor, the annulation reaction dictates topology: Scholl reaction gives Möbius topology, while InCl3‐mediated alkyne annulation gives Hückel topology. The Möbius N‐heterocycloarene is unevenly contorted as revealed by crystal structure, and the Hückel N ...
Han Chen +6 more
wiley +2 more sources
Highly-conducting molecular circuits based on antiaromaticity
Nature Communications, 2017 Antiaromatic molecules are predicted to have unusual charge transport properties, but are notoriously unstable and reactive. Here, the authors successfully fabricate an antiaromatic molecular circuit, based on a macrocyclic complex, displaying much ...
Shintaro Fujii +8 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.A library of 21 tetrakis(phenothiazinyl)‐substituted silanes with broadly variable substituent decoration, which are fully reversible multistage redox systems with intense tunable emission from deep blue to yellow–green (441–533 nm), was rapidly synthesized by bromine–lithium exchange/borylation–Suzuki coupling of tetrakis(4‐bromophenyl)silane or by ...
Thomas P. M. Merke +4 more
wiley +1 more source
ChemistryEuropeThe rectangular cyclobutadiene (CBD, C4H4) is a unique moiety for building nonbenzenoid polycyclic conjugated hydrocarbons with interesting electron‐accepting properties.
Yikun Zhu +4 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.Tris(indol‐3‐yl)methanes were synthesized from indoles, CO2, and PhMe2SiH in the presence of BPh3 in acetonitrile at 50°C. One product, tris(4‐bromo‐1‐methylindol‐3‐yl)methane, underwent a palladium‐catalyzed cascade reaction for the formation of a novel polycyclic heteroaromatic compound, where the methine C(sp3) atom originating from CO2 was ...
Sha Li +5 more
wiley +1 more source