A5005080511- Photochemistry and Electron Transfer Studies
- Electrochemical Analysis and Applications
- Luminescence Properties of Advanced Materials
- Lanthanide and Transition Metal Complexes
- Inorganic Fluorides and Related Compounds
- Analytical Chemistry and Sensors
- Electrochemical sensors and biosensors
- Metal-Organic Frameworks: Synthesis and Applications
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Porphyrin and Phthalocyanine Chemistry
- Mass Spectrometry Techniques and Applications
- Analytical chemistry methods development
- Free Radicals and Antioxidants
- Radioactive element chemistry and processing
- Magnetism in coordination complexes
- Metal complexes synthesis and properties
- Radiation Detection and Scintillator Technologies
- Radical Photochemical Reactions
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Laser-Matter Interactions and Applications
- Chalcogenide Semiconductor Thin Films
St Petersburg University
2016-2025
Sirius University of Science and Technology
2020-2021
Bowling Green State University
2010-2019
University of Waterloo
2019
The nature of exciton−plasmon interactions in Au-tipped CdS nanorods has been investigated using femtosecond transient absorption spectroscopy. study demonstrates that the key optoelectronic properties composite heterostructures comprising electrically coupled metal and semiconductor domains are substantially different from those observed systems with weak interdomain coupling. In particular, strongly nanocomposites promote mixing electronic states at semiconductor−metal domain interfaces,...
Ultrafast transient absorption spectroscopy was used to investigate the nature of photoinduced charge transfer processes taking place in ZnSe/CdS/Pt colloidal heteronanocrystals. These nanoparticles consist a dot-in-a-rod semiconductor domain (ZnSe/CdS) coupled Pt tip. Together three components are designed dissociate an electron-hole pair by pinning hole ZnSe while allowing electron into Separated charges can then induce catalytic reaction, such as light-driven hydrogen production. Present...
The ability of metal nanoparticles to capture light through plasmon excitations offers an opportunity for enhancing the optical absorption plasmon-coupled semiconductor materials via energy transfer. This process, however, requires that component is electrically insulated prevent a "backward" charge flow into and interfacial states, which causes premature dissociation excitons. Here we demonstrate such exchange can be achieved on nanoscale by using nonepitaxial Au/CdS core/shell...
The dynamics following laser-induced molecular photodissociation of gas-phase ${\mathrm{CH}}_{2}\mathrm{BrI}$ at 271.6 nm were investigated by time-resolved Coulomb-explosion imaging using intense near-IR femtosecond laser pulses. observed delay-dependent photofragment momenta reveal that undergoes C-I cleavage, depositing 65.6% the available energy into internal product states, and absorption a second UV photon breaks C-Br bond ${\mathrm{CH}}_{2}\mathrm{Br}$. Simulations confirm this...
The photodissociation dynamics of CH3I and CH2ClI at 272 nm were investigated by time-resolved Coulomb explosion imaging, with an intense non-resonant 815 probe pulse. Fragment ion momenta over a wide m/z range recorded simultaneously coupling velocity map imaging spectrometer pixel mass spectrometry camera. For both molecules, delay-dependent pump-probe features assigned to ultraviolet-induced carbon-iodine bond cleavage followed explosion. Multi-mass also allowed the sequential...
Due to its element- and site-specificity, inner-shell photoelectron spectroscopy is a widely used technique probe the chemical structure of matter. Here we show that time-resolved can be employed observe ultrafast reactions electronic response nuclear motion with high sensitivity. The ultraviolet dissociation iodomethane (CH$_3$I) investigated by ionization above iodine 4d edge, using photoion spectroscopy. dynamics observed in spectra appear earlier are faster than those seen fragments....
Laser-induced copper deposition from aqueous and – organic solutions: state of the art prospects research, V A Kochemirovsky, M Yu Skripkin, S Tveryanovich, Mereshchenko, O Gorbunov, Panov, I Tumkin, Safonov
Two series of β-NaYF4:Ln3+ nanoparticles (Ln = La-Nd, Sm-Lu) containing 20 at. % and 40 Ln3+ with well-defined morphology size were synthesized via a facile citric-acid-assisted hydrothermal method using rare-earth chlorides as the precursors. The materials composed from particles that have shape uniform hexagonal prisms an approximate 80-1100 nm. mean diameter NaYF4:Ln3+ crystals non-monotonically depended on lanthanide atomic number minimum was observed for Gd3+-doped materials. At same...
Crystalline lanthanide terephthalates, Ln2bdc3‧nH2O (Ln = La–Lu, excluding Pm), were synthesized using a surfactant-free, ultrasound-assisted method. This approach yielded microcrystals with diverse shapes and sizes ranging from 2 to 10 μm. Notably, under these conditions, lutetium terephthalate uniquely crystallized as Lu2(1,4-bdc)3·2.5H2O, while the remaining lanthanides formed tetrahydrate Ln2bdc3‧4H2O La–Nd, Sm–Yb).
The complexation behavior of lanthanide(III) ions with terephthalic acid (1,4-benzene-dicarboxylic acid) in 0.01 M KNO3 aqueous solutions was studied across a broad pH range and at two metal-to-ligand ratios using potentiometric titration combined photoluminescence spectroscopy. Chemometric analysis curves enabled the determination relative molar fractions, stability constants, probable stoichiometry formed complexes. In 1:2 ratio, bis-complexes (two terephthalate ligands per lanthanide ion)...
Luminescent, heterometallic terbium(III)-lutetium(III) terephthalate metal-organic frameworks (MOFs) were synthesized via direct reaction between aqueous solutions of disodium and nitrates corresponding lanthanides by using two methods: synthesis from diluted concentrated solutions. For (TbxLu1-x)2bdc3·nH2O MOFs (bdc = 1,4-benzenedicarboxylate) containing more than 30 at. % Tb3+, only one crystalline phase was formed: Ln2bdc3·4H2O. At lower Tb3+ concentrations, crystallized as the mixture...
Genetically encoded voltage indicators (GEVIs) have found wide applications as molecular tools for visualization of changes in cell membrane potential. Among others, several classes archaerhodopsin-3-based GEVIs been developed and proved themselves promising various imaging studies. To expand the application range this type GEVIs, new variants with absorption band maxima shifted toward first biological window enhanced fluorescence signal are required. Here, we integrate computational...
New heterometallic antenna terephthalate MOFs, namely, (Eu
β-NaYF4 microcrystals co-doped with Yb3+, Er3+/Tm3+, and Gd3+ ions were synthesized via a hydrothermal method using rare-earth chlorides as the precursors. The SEM XRD data show that doped form uniform hexagonal prisms an approximate size of 600-800 nm. partial substitution Y by Gd results in reduction microcrystals. Upconversion luminescence spectra upon 980 nm excitation contain characteristic intra-configurational ff bands Er3+/Tm3+ ions. An addition leads to significant enhancement...
A new series of luminescent heterometallic europium(III)-lutetium(III) terephthalate metal-organic frameworks, namely (EuxLu1-x)2bdc3·nH2O, was synthesized using a direct reaction in water solution. At the Eu3+ concentration 1-40 at %, MOFs were formed as binary mixture (EuxLu1-x)2bdc3 and (EuxLu1-x)2bdc3·4H2O crystalline phases, where Ln2bdc3·4H2O phase enriched by europium(III) ions. an more than 40 only one formed: (EuxLu1-x)2bdc3·4H2O. All containing exhibited sensitization bright...
Ultrafast transient absorption spectra in the deep to near UV range (212-384 nm) were measured for [Cu(II)(MeOH)(5)Cl](+) complexes methanol following 255-nm excitation of complex into ligand-to-metal charge-transfer excited state. The electronically undergoes sub-200 fs radiationless decay, predominantly via back electron transfer, hot electronic ground state followed by fast vibrational relaxation on a 0.4-4 ps time scale. A minor photochemical channel is Cu-Cl bond dissociation, leading...
Oxidative damage to purine nucleic acid bases proceeds through quinoidal intermediates derived from their corresponding 8-oxo-7,8-dihydropurine bases. Oxidation studies of 8-oxo-7,8-dihyroadenosine and 8-oxo-7,8-dihydroinosine indicate that these species can produce stable cross-links with a wide variety nucleophiles in the 2-positions purines. An azide precursor for adenosine iminoquinone has been synthesized applied ultrafast transient absorption spectroscopic studies. Thus, be observed...
Photochemistry of copper(II) monochlorocomplexes in methanol and acetonitrile solutions is studied by UV-pump/broadband deep-UV-to-near-IR probe femtosecond transient absorption spectroscopy. Upon 255 266 nm excitation, the complexes methanol, respectively, are promoted to excited ligand-to-metal charge transfer (LMCT) state, which has a short (sub-250 fs) lifetime. From LMCT decay via internal conversion lower-lying ligand field (LF) d-d states or vibrationally hot ground electronic state....