Invited for the cover of this issue is the group of Yohei Okada at Tokyo University of Agriculture and Technology. The image depicts a series of single-benzene fluorophores. Constructing symmetrical push-pull motifs in combination with restricting bond rotations is the key to creating small yet brightly emitting fluorophores. Read the full text of the article at 10.1002/chem.202301411.
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http://dx.doi.org/10.1002/chem.202302000 | DOI Listing |
Molecules
November 2024
Institute of Chemistry, Siberian Division of the Russian Academy of Sciences, 1 Favorsky Street, 664033 Irkutsk, Russia.
The review summarizes the results of previous and the latest studies on aromaticity and related concepts. The electron counting rule for 3D-aromatic systems 2(n + 1) is shown to be a generalization of the 4n + 2 rule for planar molecules, and, vice versa, the latter can be derived from the former. The relative stability of the push-pull and captodative aromatic systems is shown to depend on the nature of the groups separated by the C=C bond in geminal or vicinal positions.
View Article and Find Full Text PDFDalton Trans
October 2024
Laboratory for Zero-Carbon Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1 N1-32, O-okayama, Meguro-ku, 152-8550 Tokyo, Japan.
Combination of a uranyl(VI) ion (UO) with a redox-active ligand results in characteristic electronic structures that cannot be achieved by either component alone. In this study, three UO complexes that bear symmetric or asymmetric 2,6-diiminopyridine-based ligands were synthesized and found to exhibit a first redox couple between -1.17 V and -1.
View Article and Find Full Text PDFSmall
November 2024
Research Institute for Sustainable Energy, Center for Research and Education in Science and Technology (TCG-CREST), Salt Lake, Kolkata, 700091, India.
Application of an aqueous Zn-ion battery is plagued by a water-induced hydrogen evolution reaction (HER), resulting in local pH variations and an unstable electrode-electrolyte interface (EEI) with uncontrolled Zn plating and side reactions. Here, 4-methyl pyridine N-oxide (PNO) is introduced as a redox non-innocent additive that comprises a hydrophilic bipolar N-O ion pair as a coordinating ligand for Zn and a hydrophobic ─CH group at the para position of the pyridine ring that reduces water activity at the EEI, thereby enhancing stability. The N-O moiety of PNO possesses the unique functionality of an efficient push electron donor and pull electron acceptor, thus maintaining the desired pH during charging/discharging.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
July 2024
Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808, China.
Aqueous zinc-metal batteries are prospective energy storge devices due to their intrinsically high safety and cost effectiveness. Yet, uneven deposition of zinc ions in electrochemical reduction and side reactions at the anode interface significantly hinder their development and application. Here, we propose a solvation-interface attenuation strategy enabled by a frustrated tertiary amine amphiphilic dipolymer electrolyte additive.
View Article and Find Full Text PDFChemistry
May 2024
Department of Chemistry, University of North Texas, Denton, Texas, 76203-5017, United States.
Unraveling the intriguing aspects of the intramolecular charge transfer (ICT) phenomenon of multi-modular donor-acceptor-based push-pull systems are of paramount importance considering their promising applications, particularly in solar energy harvesting and light-emitting devices. Herein, a series of symmetrical and unsymmetrical donor-acceptor chromophores 1-6, are designed and synthesized by the Corey-Fuchs reaction via Evano's condition followed by [2+2] cycloaddition retroelectrocyclic ring-opening reaction with strong electron acceptors TCNE and TCNQ in good yields (~60-85 %). The photophysical, electrochemical, and computational studies are investigated to explore the effect of incorporation of strong electron acceptors 1,1,4,4-tetracyanobuta-1,3-diene (TCBD) and dicyanoquinodimethane (DCNQ) with phenothiazine (PTZ) donor.
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