A5073029911- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Conducting polymers and applications
- Synthesis and Properties of Aromatic Compounds
- Electrochemical Analysis and Applications
- Analytical Chemistry and Sensors
- Fullerene Chemistry and Applications
- Luminescence and Fluorescent Materials
- Molecular Junctions and Nanostructures
- Graphene research and applications
- Organic Electronics and Photovoltaics
- Transition Metal Oxide Nanomaterials
- Photochromic and Fluorescence Chemistry
- Advanced Battery Materials and Technologies
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Organometallic Complex Synthesis and Catalysis
- Organoboron and organosilicon chemistry
- Gas Sensing Nanomaterials and Sensors
- Advancements in Battery Materials
- Magnetism in coordination complexes
- Electrochemical sensors and biosensors
- Supercapacitor Materials and Fabrication
- Catalytic C–H Functionalization Methods
- ZnO doping and properties
Leibniz Institute for Solid State and Materials Research
2016-2025
Lomonosov Moscow State University
2024
Institute for Nuclear Research
2024
Moscow State University
2024
University of Maroua
2023
Institute of Physics and Technology
2005-2018
Satbayev University
2018
Leibniz Institute for Neurobiology
2015
Leibniz Association
2011-2014
Physicotechnical Institute
2014
Rechargeable aqueous Zn-ion energy storage devices are promising candidates for next-generation technologies. However, the lack of highly reversible Zn2+-storage anode materials with low potential windows remains a primary concern. Here, we report two-dimensional polyarylimide covalent organic framework (PI-COF) high-kinetics capability. The well-organized pore channels PI-COF allow high accessibility build-in redox-active carbonyl groups and efficient ion diffusion barrier. constructed...
Abstract Three unprecedented helical nanographenes ( 1 , 2 and 3 ) containing an azulene unit are synthesized. The resultant structures unambiguously confirmed by X‐ray crystallographic analysis. embedded in possesses a record‐high twisting degree (16.1°) as result of the contiguous steric repulsion at inner rim. Structural analysis combination with theoretical calculations reveals that these manifest global aromatic structure, while exhibits weak antiaromatic character. Furthermore,...
Rechargeable aluminium (Al) batteries (RABs) have long-been pursued due to the high sustainability and three-electron-transfer properties of Al metal. However, limited redox chemistry is available for rechargeable batteries, which restricts exploration cathode materials. Herein, we demonstrate an efficient Al-amine battery based on a quaternization reaction, in nitrogen (radical) cations (R
Abstract A negatively curved aza‐nanographene (NG) containing two octagons was synthesized by a regioselective and stepwise cyclodehydrogenation procedure, in which double aza[7]helicene simultaneously formed as an intermediate. Their saddle‐shaped structures with negative curvature were unambiguously confirmed X‐ray crystallography, thereby enabling the exploration of structure–property relationship photophysical, electrochemical conformational studies. Moreover, assembly octagon‐embedded...
Two-dimensional conjugated metal-organic frameworks (2D c-MOFs) have emerged as an intriguing class of quantum materials due to their high crystallinity, persistent spin centers, and tunable structures topologies. However, it remains unclear how achieve long relaxation time at room temperature in 2D c-MOFs via a bottom-up design strategy. Herein, we hexahydroxytrithiatruxene ligand (HHTH) minimize the influence nuclear on electron while weakening d-π conjugation construct "spin docking" for...
The structure of emeraldine salt and bases with different molar weight their behavior in electrochemical doping was studied by spectroscopic spectroelectrochemical techniques. By Fourier transform infrared (FTIR) spectroscopy, the branching polymer chain at tri- tetrasubstituted benzene rings as well presence small amounts phenazine units are shown. chains increases increasing emeraldines. optical transitions protonated unprotonated were ultraviolet–visible near-infrared (UV–vis NIR)...
The structure and stabilization of charged states during p-doping polyaniline (PANI) were studied by in situATR-FTIR spectroelectrochemistry. role phenazine-like units several copolymers aniline a phenazine derivative (3,7-diamino-5-phenylphenazinium chloride, phenosafranine) was investigated PANI three with different to phenosafranine ratio electrochemically prepared. FTIR spectra as-prepared polymers as well situFTIR the oxidation give evidence presence prepared PANI, shown vibrations...
The precision synthesis of helical bilayer nanographenes (NGs) with new topology is substantial interest because their exotic physicochemical properties. However, NGs bearing non-hexagonal rings remain synthetically challenging. Here we present the efficient first nonbenzenoid nanographene (HBNG1) from a tailor-made azulene-embedded precursor, which contains novel [10]helicene backbone two embedded heptagons. Single-crystal X-ray analysis reveals its highly twisted geometry record small...
Open-shell non-alternant polycyclic hydrocarbons (PHs) are attracting increasing attention due to their promising applications in organic spintronics and quantum computing. Herein we report the synthesis of three cyclohepta[def]fluorene-based diradicaloids (1-3), by fusion benzo rings on its periphery for thermodynamic stabilization, as evidenced multiple characterization techniques. Remarkably, all them display a very narrow optical energy gap (E
The electrochemical doping of emeraldine salt and bases with different weight average molecular weights was studied by in situ Fourier transform infrared (FTIR) spectroelectrochemistry using attenuated total reflection (ATR) technique. formation stabilization charge carriers polyaniline during p-doping followed dependence the chain branching. potential IR bands oxidation polymer clearly demonstrates charged structures (π-dimers, polarons, bipolarons). It is shown that usually attributed to a...
The disinfection of bacteria by thermally excited pyroelectric materials in aqueous environments provides opportunities for the development new means sanitization. However, little is known about formation reactive oxygen species (ROS) at surface materials. To investigate pyroelectrically driven ROS generation we performed OH radical specific measurements stimulated barium titanate nanoparticles contact with palladium nanoparticles. Through electron spin resonance trap BMPO...
Abstract Three unprecedented helical nanographenes ( 1 , 2 and 3 ) containing an azulene unit are synthesized. The resultant structures unambiguously confirmed by X‐ray crystallographic analysis. embedded in possesses a record‐high twisting degree (16.1°) as result of the contiguous steric repulsion at inner rim. Structural analysis combination with theoretical calculations reveals that these manifest global aromatic structure, while exhibits weak antiaromatic character. Furthermore,...
Two novel nonhexagonal ring fused NBN-dibenzophenalenes (NBN-penta and NBN-hepta) were designed synthesized. X-ray analysis reveals the planar structure of NBN-penta, while NBN-hepta displays a double-helical structure. Both compounds possess higher oxidation potential compared to NBN-type zigzag-edged polycyclic aromatic hydrocarbons. The resultant NBN-penta exhibit global character based on DFT calculations. Furthermore, single crystal transistors fabricated, manifesting their promising in...
Combining solution-based and surface-assisted synthesis, we demonstrate the first synthesis of NBN-doped bis-tetracene (NBN-BT) peri-tetracene (NBN-PT). The chemical structures are clearly elucidated by high-resolution scanning tunneling microscopy (STM) in combination with noncontact atomic force (nc-AFM). Scanning spectroscopy (STS) characterizations reveal that NBN-BT NBN-PT possess higher energy gaps than peri-tetracene. Interestingly, can undergo stepwise one-electron oxidation convert...
Abstract n‐peri‐Acenes (n‐PAs) have gained interest as model systems of zigzag‐edged graphene nanoribbons for potential applications in nanoelectronics and spintronics. However, the synthesis n‐PAs larger than peri‐tetracene remains challenging because their intrinsic open‐shell character high reactivity. Presented here is a hitherto unknown n‐PA, that is, peri‐heptacene ( 7‐PA ), which reactive zigzag edges are kinetically protected with eight 4‐tBu‐C 6 H 4 groups. The formation validated...
Mixed-valence (MV) binuclear ferrocenyl compounds have long been studied as models for testing theories of electron transfer and in attempts to design molecular-scale electronic devices (e.g., molecular wires). In contrary that, far less attention has paid MV ferrocenes anticancer agents. Herein, we discuss the synthesis six 1,2,3-triazole combined (spectro)electrochemical, paramagnetic resonance (EPR), computational, activity studies. Our synthetic approach was based on copper-catalyzed...
The transitions near the middle oxidation peak of polyaniline were studied by resonance Raman spectroelectrochemistry. Localization polarons was observed in potential region between first and peaks connected with coupling into pairs – specific bands separated polarons, emeraldine states general. In addition, a connection cyclic voltammetry hydroquinone/benzoquinone defect redox transition confirmed. These findings allow more precise determination oxidation, protonation, degradation level...
Abstract Quinoidal azaacenes with almost pure diradical character ( y= 0.95 to 0.99) were synthesized. All compounds exhibit paramagnetic behavior investigated by EPR and NMR spectroscopy, SQUID measurements, revealing thermally populated triplet states an extremely low‐energy gap Δ E ST′ of 0.58 1.0 kcal mol −1 . The species are persistent in solution (half‐life≈14–21 h) the solid state they stable for weeks.
The role of the phenazine structure in stabilization charged states polyaniline was studied by situ electron spin resonance (ESR)-UV/vis-near-infrared (NIR) spectroelectrochemistry and copolymers aniline a derivative (3,7-diamino-5-phenylphenazinium chloride, phenosafranine). It is shown that copolymer can be prepared electropolymerization, its confirmed mass spectrometry IR spectroscopy. electrochemistry pointed to preferred polaron pair at initial charge transfer reaction instead polarons...
Abstract The reaction of the bis(imidazoliumyl)‐substituted P I cation [(2‐Im Dipp )P(4‐Im )] + ( 10 ) (2‐Im=imidazolium‐2‐yl; 4‐Im=imidazolium‐4‐yl; Dipp=2,6‐di‐isopropylphenyl) with trifluoromethanesulfonic acid (HOTf) or methyl trifluoromethylsulfonate (MeOTf) yields corresponding protonated )PH(4‐Im 2+ 11 and methylated )PMe(4‐Im 12 dications, respectively. EPR/UV/Vis‐NIR spectroelectrochemical investigation low‐coordinated predicted a stable “bottleable” P‐centered radical dication 2+....
A furan-based double [7]heterohelicene and its radical cation were achieved with fascinating chiroptical response for the neutral compound.