Results 201 to 210 of about 353,613 (251)

Aromaticity in Fully π-Conjugated Multicyclic Macrocycles

Journal of the American Chemical Society, 2023
The research on aromaticity has mainly focused on monocyclic [n]annulene-like systems or polycyclic aromatic hydrocarbons. For fully π-conjugated multicyclic macrocycles (MMCs), the electronic coupling between the individual constitutional macrocycles would lead to unique electronic structures and aromaticity.
Longbin Ren, Yi Han, Xudong Hou, Yong Ni, Ya Zou, Tianyu Jiao, Jishan Wu   +6 more
openaire   +2 more sources

Aromaticity in Fully π-Conjugated Open-Cage Molecules

Journal of the American Chemical Society, 2022
Although aromaticity in 2D π-conjugated monocyclic and polycyclic molecules has been intensively studied, aromaticity in 3D fully π-conjugated molecular cages remains largely unexplored mainly due to the synthetic challenges. Herein, we report the facile synthesis of a π-conjugated molecular cage (1) containing four dimethylmethylene-bridged ...
Shaofei Wu, Yong Ni, Yi Han, Shan Xin, Xudong Hou, Jun Zhu, Zhengtao Li, Jishan Wu   +7 more
openaire   +2 more sources

A Fully Conjugated Planar Heterocyclic [9]Circulene

Journal of the American Chemical Society, 2020
Fully aromatic [n]circulenes have only been known to encompass up to eight aromatic rings (n = 8), with no reports of endeavors in the synthesis of higher-order analogues (n > 8). Herein we present the first [9]circulene, formally a diazatrioxa[9]circulene, along with a tetrahydro-diazatetraoxa[10]circulene.
Stephan K. Pedersen, Kristina Eriksen, Hans Ågren, Boris F. Minaev, Nataliya N. Karaush-Karmazin, Ole Hammerich, Glib V. Baryshnikov, Michael Pittelkow   +7 more
openaire   +3 more sources

Evidence for Fully Conjugated Double‐Stranded Cycles

Chemistry – A European Journal, 2011
AbstractA chain of circumstantial evidence for the existence of the first fully conjugated, double‐stranded cycles is presented. The products have the structure of the belt‐region of fullerene C84 (D2) and carry either four hexyl chains or four phenyl groups. The unsubstituted parent cycle is also presented.
Standera M, Häfliger R, Gershoni-Poranne R, Stanger A, Jeschke G, Van Beek JD, Bertschi L, Schlüter AD   +7 more
openaire   +3 more sources

Fully Conjugated and Soluble Polyazomethines

Macromolecules, 1997
Fully conjugated and soluble polyazomethines were synthesized by the polycondensation of aromatic dialdehydes with two kinds of diamines having a tetraphenylethylene structure, cis- and trans-1,2-b...
Toshihiko Matsumoto, Fumihiko Yamada, Toshikazu Kurosaki   +2 more
openaire   +1 more source

Three-Dimensional Fully Conjugated Carbaporphyrin Cage

Journal of the American Chemical Society, 2018
A fully conjugated three-dimensional (3D) expanded carbaporphyrin (2) was prepared in a one-pot procedure that involves a [2+4] condensation reaction between a dibenzo[ g, p]chrysene-bearing tetrapyrrole precursor (1) and pentafluorobenzaldehyde, followed by oxidation.
Xian-Sheng Ke, Taeyeon Kim, Qing He, Vincent M. Lynch, Dongho Kim, Jonathan L. Sessler   +5 more
openaire   +2 more sources

Point defects in fully conjugated polymers

Journal of Applied Physics, 1976
Formation thermodynamics is examined for two different types of point defects which interrupt conjugation in polydiacetylene crystals: bond-alternation and orbital-flip defects. While bond-alternation defects in these polymers are analogous to previously investigated radical pair defects in the polyenes, much lower equilibrium concentrations are ...
R. H. Baughman, R. R. Chance
openaire   +1 more source

Fully-Naphthalenoid Hydrocarbons and their Conjugation Modes

Polycyclic Aromatic Compounds, 1994
Abstract A fully-naphthalenoid hydrocarbon (FUN) is a benzenoid hydrocarbon whose all π-electrons can be (formally) grouped into disjoint naphthalene-units. The cyclic conjugation in FUNs is studied by means of the energy-effects of their various cycles.
Ivan Gutman, Sven J. Cyvin, Vesna Petrović, Aleksandar Teodorović   +3 more
openaire   +1 more source

A fully implicit conjugate heat transfer method

Numerical Heat Transfer, Part B: Fundamentals, 2020
This article deals with the development of an implicit and conservative method for conjugate heat transfer at solid-fluid interfaces.
Mangani, Luca, Darwish, Marwan, Hanimann, Lucian, Al Abed, Ali, Casartelli, Ernesto, Moukalled, Fadl   +5 more
openaire   +2 more sources

The role of borole in a fully conjugated electron-rich system

Chemical Communications, 2004
The reaction of the 3,3[prime or minute]-dilithiobithieno complex with TipB(OMe)(2) affords a borole with an extended conjugated electron-rich [small pi]-electron system; the electronic perturbation by the introduction of push-pull substituents is described.
Sanghoon, Kim, Kee-Hyung, Song, Sang Ook, Kang, Jaejung, Ko   +3 more
openaire   +2 more sources