Results 21 to 30 of about 8,902 (203)

Single-Atom Control of Aromaticity and Excited-State Dynamics in Endohedral Zirconium-Antimony Zintl Clusters. [PDF]

Angew Chem Int Ed Engl
Single‐atom growth from [Zr@Sb12]2− to [Zr@Sb13]3− disrupts the closed‐shell S2P6 superatomic configuration and markedly attenuates three‐dimensional (3D) aromaticity. Ultrafast spectroscopy further links stronger spherical aromaticity to slower excited‐state relaxation, establishing an atom‐resolved structure‐aromaticity‐dynamics relationship ...
Zhang Y, Deng Z, Tian WJ, Sun HQ, Sun K, Muñoz-Castro A, Sun ZM, Chen TT.   +7 more
europepmc   +3 more sources

Diversity‐Oriented Two‐Step Annulative π‐Extension Enables Access to Structurally Complex Nanographenes

Angewandte Chemie, EarlyView.
Pd‐catalyzed C–H arylation of polycyclic aromatic hydrocarbons (PAHs) with various aryltrimethylsilanes enables the preparation of structurally complicated arylated PAHs, which can be further transformed to nanographenes in a manner of two‐step annulative π‐extension (APEX) reaction.
Honami Katsuragawa, Yoshifumi Toyama, Shota Mikawa, Kou P. Kawahara, Hideto Ito, Kenichiro Itami   +5 more
wiley   +2 more sources

Access to Unsupported Iminobismuthane and Tetraazabismole Species Enabled by a Rigid and Bulky Organobismuthinidene

Angewandte Chemie, EarlyView.
By employing a sterically bulky monocoordinate bismuthinidene, the synthesis and characterization of the first examples of an unsupported iminobismuthane and tetraazabismole was achieved via reactions with organic azides. The corresponding amines could be accessed by reduction, leading to the regeneration of the Bi(I) compound. Hence, we also highlight
Marcel Potocnik, Kristian L. Mears, Davide Spinnato, Gabriele Deplano, Nils Nöthling, Markus Leutzsch, Maurice van Gastel, Khai‐Nghi Truong, Serena DeBeer, Josep Cornella   +9 more
wiley   +2 more sources

Axially Chiral Nonalternant Polycyclic Aromatic Hydrocarbon With Consecutive Pentagons Exhibiting Large Spin‐Polarized Current

Angewandte Chemie, EarlyView.
Here we report two nonalternant polycyclic aromatic hydrocarbons (PAH) (1 and 2), which contain two and four consecutive pentagons, respectively. Under acidic conditions, 1 and 2 dimerize to afford the axially chiral dimers AC1 and AC2. The central azulene moiety in both 2 and AC2 shows an unusually short transannular bond of 1.366 Å.
Chang Wang, Jiaxin Luo, Haipeng Lu, Junzhi Liu   +3 more
wiley   +2 more sources

Nic

Kwartalnik Filmowy, 2016
Artykuł zestawia 4'33''(1952) Johna Cage'a i Zen for Film (1964) Nam June Paika - dwa przełomowe utwory amerykańskiej awangardy. Andrzej Pitrus próbuje uchwycić rodzaj dialogu, jaki został nawiązany przez dwóch artystów wprowadzających do swego artystycznego języka elementy aleatoryczne.
openaire   +4 more sources

Chemical Switching Between B2N and B2C Homoaromaticity

Angewandte Chemie, EarlyView.
We report the synthesis of homoaromatic 1‐aza‐2,4‐diazadiboretane with a bicyclic four‐membered NB2C motif and demonstrate experimentally and theoretically that the homoaromatic delocalization can also be chemically shifted from the B2N to the B2C moiety by deprotonation of the ring carbon atom.
Tim Wiesmeier, Philipp Grewelinger, Carsten Präsang, Bernd Morgenstern, Diego M. Andrada, David Scheschkewitz   +5 more
wiley   +2 more sources

Initial Studies of the Effects of Halogenated Dispersions on the Amount of NICS of Rings for C8H12XNO2 [PDF]

International Journal of New Chemistry, 2017
In this research at the first complex and its halogenated derivatives were optimized. NBO calculations and NMR for the complexes were carried out at the B3LYP/6-31G*quantum chemistry level. In the 1- (4-fluorophenyl) -2, 3-dihydro-1 H-naphto- [1, 2-e] [1,
Neda Niakan
doaj   +1 more source

Study of fluoroscopic landmarks in IVUS guided zero contrast PCI - A single centre experience

Indian Heart Journal
Introduction: Contrast induced nephropathy is third most common cause of renal insufficiency following percutaneous coronary angioplasty (PCI) and patients with preexisting renal dysfunction are even at a higher risk for poor outcomes. With the advent of
Uday B. Khanolkar, Pankaj Banotra, Bijay Kumar Mahala, Nitin Kumar Hegde, Blessvin Jino, Devi Prasad Shetty, Parin Chandrakant Sangoi   +6 more
doaj   +1 more source

Investigating the Effect of Changes of Halogenated Compounds on the Aromaticity Flow (NICS) of Rings 5-fluorophenyl-1, 3, 7, 9-tetra methylpyrido [2,3] [d-5,6 dipyrimidine -2, 4, 6 and 8 tetron [PDF]

International Journal of New Chemistry, 2017
In the combination of 5-fluorophenyl-1, 3, 7, 9-tetra methyl pyrido [2, 3, d, d, 5, 6 di pyrimidine -2, 4, 6, and 8 tetron, there are 4 rings, respectively, ring that is attached to the halogen ring A and, respectively, a ring The lower and the right to ...
Faride Ahmadi
doaj   +1 more source

Database of Nuclear Independent Chemical Shifts (NICS) versus NICS_ZZ of Polycyclic Aromatic Hydrocarbons (PAHs)

, 2019
In the present contribution, we have developed a database, called the FAR-database, where the acronym FAR stands for Fused Aromatic Rings, which presents the results of nuclear independent chemical shifts calculations, NICS(0), NICS(1), NICS(0)ZZ, and ...
Fernando Alvarez-Ramírez (2333290), Yosadara Ruiz-Morales (1503736), Fernando Alvarez-Ramírez, Yosadara Ruiz-Morales   +3 more
core   +1 more source