Results 81 to 90 of about 1,579 (190)

Coordinates for "Global Aromaticity and Antiaromaticity in Porphyrin Nanoring Anions"

open access: yes, 2019
Cartesian coordinates accompanying "Global Aromaticity and Antiaromaticity in Porphyrin Nanoring Anions", calculated using Gaussian16; B3LYP.
Martin Peeks (3291489)   +3 more
core   +1 more source

Enhancing the Antiaromaticity of s-Indacenes Through Heterocycle Fusion [PDF]

open access: yes
Antiaromaticity, while associated with instability, imparts beneficial properties such as decreased HOMO-LUMO energy gaps. Compounds containing antiaromatic subunits are not only of fundamental interest, but of interest as components in organic ...
Warren, Gabrielle
core   +1 more source

Aromaticity as a Guiding Concept for Spectroscopic Features and Nonlinear Optical Properties of Porphyrinoids

open access: yesMolecules, 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
doaj   +1 more source

Dications of 3-Phenylindenylidenefluorenes:  Evaluation of Antiaromaticity of Indenyl and Fluorenyl Cations by Magnetic Measures

open access: yes, 2016
Dications of p-substituted 3-phenylindenylidenefluorenes were prepared to examine the response of the resulting indenyl and fluorenyl cationic systems to magnetic measures of antiaromaticity.
Nancy S. Mills (2135851)   +4 more
core   +1 more source

Energetic Preferences in Cyclic π-Conjugated Systems: Aromaticity Localizes and Antiaromaticity Spreads

open access: yesChemistry
Cyclic 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
doaj   +1 more source

Recent advances in antiaromatic metallacycles

open access: yesDalton Transactions
Recently, 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
openaire   +2 more sources

Excited-state proton transfer relieves antiaromaticity in molecules

open access: yes, 2019
Baird’s rule explains why and when excited-state proton transfer (ESPT) reactions happen in organic compounds. Bifunctional compounds that are [4n + 2] π-aromatic in the ground state, become [4n + 2] π-antiaromatic in the first 1ππ* states, and proton ...
Karas, Lucas José,   +3 more
core   +1 more source

Synthesis of Cyclobutadienoid-Fused Phenazines with Strongly Modulated Degrees of Antiaromaticity

open access: yes, 2018
The streamlined synthesis of a series of regioisomeric azaacene analogues containing fused phenazine and antiaromatic cyclobutadienoids (CBDs), using a catalytic arene–oxanorbornene annulation, followed by aromatization is reported.
Zexin Jin (327148)   +2 more
core   +1 more source

Dianion and Dication of Tetrabenzo[5.7]fulvalene. Greater Antiaromaticity than Aromaticity in Comparable Systems

open access: yes, 2016
The dianion, 52−, and dication, 52+, of tetrabenzo[5.7]fulvalene represent an aromaticity/antiaromaticity continuum in which the fluorenyl system changes from aromatic in 52− to antiaromatic in 52+. Conversely, the antiaromatic dibenzotropylium system of
Abraham Yousef (2411293)   +2 more
core   +1 more source

Fully Conjugated Heteroatomic Non- and Quasi-Alternant Polyradicals

open access: yesChemistry
In 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
doaj   +1 more source

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