Results 1 to 10 of about 23,403 (201)

Theoretical Study on the Open-Shell Electronic Structure and Electron Conductivity of [18]Annulene as a Molecular Parallel Circuit Model [PDF]

Nanomaterials, 2023
Herein, the electron conductivities of [18]annulene and its derivatives are theoretically examined as a molecular parallel circuit model consisting of two linear polyenes. Their electron conductivities are estimated by elastic scattering Green’s function
Naoka Amamizu, Mitsuhiro Nishida, Keisuke Sasaki, Ryohei Kishi, Yasutaka Kitagawa   +4 more
doaj   +2 more sources

On-surface synthesis of nitrogen-doped nanographene with an [18]annulene pore on Ag(111) [PDF]

Communications Chemistry, 2023
On-surface synthesis is of importance to fabricate low dimensional carbon-based nanomaterials with atomic precision. Here, we synthesize nitrogen-doped nanographene with an [18]annulene pore and its dimer through sequential reactions of debromination ...
Kewei Sun, Donglin Li, Takahito Kaihara, Satoshi Minakata, Youhei Takeda, Shigeki Kawai   +5 more
doaj   +2 more sources

Metal-free double azide addition to strained alkynes of an octadehydrodibenzo[12]annulene derivative with electron-withdrawing substituents [PDF]

Beilstein Journal of Organic Chemistry
Strain-promoted azide–alkyne cycloaddition (SpAAC) is a powerful tool in the field of bioconjugation and materials research. We previously reported a regioselective double addition of organic azides to octadehydrodibenzo[12]annulene derivatives with ...
Naoki Takeda, Shuichi Akasaka, Susumu Kawauchi, Tsuyoshi Michinobu   +3 more
doaj   +2 more sources

Non-aromatic annulene-based aggregation-induced emission system via aromaticity reversal process

Nature Communications, 2019
Molecular systems displaying aggregation-induced emission (AIE) have important biomedical and optoelectronic applications. Here the authors report a further mechanism for AIE, through aromaticity reversal from the ground state to the excited state, in ...
Zheng Zhao, Xiao-Yan Zheng, Lili Du
exaly   +2 more sources

On-surface synthesis of porous graphene nanoribbons mediated by phenyl migration [PDF]

Communications Chemistry
Advancements in the on-surface synthesis of atomically precise graphene nanostructures are propelled by the introduction of innovative precursor designs and reaction types.
César Moreno, Xabier Diaz de Cerio, Maria Tenorio, Fei Gao, Manuel Vilas-Varela, Ane Sarasola, Diego Peña, Aran Garcia-Lekue, Aitor Mugarza   +8 more
doaj   +2 more sources

Synthesis of Novel Nitro-Halogenated Aryl-Himachalene Sesquiterpenes from Atlas Cedar Oil Components: Characterization, DFT Studies, and Molecular Docking Analysis against Various Isolated Smooth Muscles [PDF]

Molecules
We report the synthesis of two novel halogenated nitro-arylhimachalene derivatives: 2-bromo-3,5,5,9-tetramethyl-1-nitro-6,7,8,9-tetrahydro-5H-benzo[7]annulene (bromo-nitro-arylhimachalene) and 2-chloro-3,5,5,9-tetramethyl-1,4-dinitro-6,7,8,9-tetrahydro ...
Youssef Edder, Issam Louchachha, Abdelmajid Faris, Mohamed Maatallah, Khalil Azzaoui, Mohammed Zerrouk, Mohamed Saadi, Lahcen El Ammari, Moha Berraho, Mohammed Merzouki, Brahim Boualy, Belkheir Hammouti, Rachid Sabbahi, Abdallah Karim, Mohammed M. Alanazi, Alicia Ayerdi Gotor, Larbi Rhazi   +16 more
doaj   +2 more sources

On molecular graphs and digraphs of annulenes and their spectra [PDF]

Journal of the Serbian Chemical Society, 2001
Amolecular graph, consisting of undirected edges, can be represented as a sum of two digraphs, consisting of oppositely oriented directed edges. In the case of annulenes, the eigenvalue spectrum of the molecular graph is equal to the sum of the ...
Gutman Ivan, Plath Peter J.
doaj   +3 more sources

Topological properties of altan-benzenoid hydrocarbons [PDF]

Journal of the Serbian Chemical Society, 2014
The main topological characteristics of altan-benzenoids are established. In particular, it is shown that the perimeter of Kekuléan altan-benzenoids is of size 4k , having a destablizing (antiaromatic) energy effect, similar to (4k)-annulenes.
Gutman Ivan
doaj   +1 more source

Synthesis of a Naphthalocyanine-Like Dye: The First Report on Zn(II)-1,6-methano[10]annulenecyanine

Molecules, 2020
The synthesis of the new dye 1,6-methano[10]annulenecyanine is described. For this purpose, the 3,4-dicyano-1,6-methano[10]annulene and 3,4-carboxyimide-1,6-methano[10]annulene buildings blocks were synthesized in six to eight steps. In both cases, these
Nicholas Roberto da Silva Gobo, Timothy John Brocksom, Kleber Thiago de Oliveira   +2 more
doaj   +1 more source

Dimerization/Elimination of β-Styrylmalonates under Action of TiCl₄

Molecules, 2022
A new type of dimerization of dimethyl (β-styryl)malonates in the presence of TiCl4 accompanied by elimination of a methanol molecule was discovered.
D. D. Borisov, G. R. Chermashentsev, K. V. Potapov, R. A. Novikov, Yu. V. Tomilov   +4 more
doaj   +1 more source