A5037695967- Luminescence and Fluorescent Materials
- Porphyrin and Phthalocyanine Chemistry
- Molecular Sensors and Ion Detection
- Photochromic and Fluorescence Chemistry
- Nonlinear Optical Materials Studies
- Conducting polymers and applications
- Nanoplatforms for cancer theranostics
- Nonlinear Optical Materials Research
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Photochemistry and Electron Transfer Studies
- Synthesis of Organic Compounds
- Polydiacetylene-based materials and applications
- Dyeing and Modifying Textile Fibers
- Oxidative Organic Chemistry Reactions
- Organic Light-Emitting Diodes Research
- Carbon Nanotubes in Composites
- Analytical Chemistry and Chromatography
- Photoreceptor and optogenetics research
- Photodynamic Therapy Research Studies
- Organoboron and organosilicon chemistry
- Synthesis and Properties of Aromatic Compounds
- Spectroscopy and Quantum Chemical Studies
- Photopolymerization techniques and applications
- Protein Interaction Studies and Fluorescence Analysis
National Academy of Sciences of Ukraine
2012-2024
Institute of Organic Chemistry
2013-2024
University of Central Florida
2010
Institute of Physics
2010
Institute of Bioorganic Chemistry and Petrochemistry V.P. Kukhar
1996
Optical spectra of two families symmetrical polymethine dyes, bearing a positive and negative charge, are analyzed based on an essential-state model recently developed for quadrupolar dyes. The accounts molecular vibrations polar solvation reproduces the anomalous evolution with solvent polarity experimental absorption band shapes. Fluorescence excited-state well-described within same model, which also quantitatively recent observation intense two-photon toward (two-photon forbidden) lowest...
We present an experimental and theoretical investigation of the linear nonlinear optical properties a series acceptor-pi-acceptor symmetrical anionic polymethine dyes with diethylamino-coumarin-dioxaborine terminal groups different conjugation lengths. Two-photon absorption (2PA) cross sections (delta(2PA)) are enhanced increase pi-conjugation length in investigated dyes. 2PA spectra for all consist two well-separated bands. The first band, located within telecommunications window, occurs...
The multifunctional properties of carbon nanotubes (CNTs) make them a powerful platform for unprecedented innovations in variety practical applications. As result the surging growth nanotechnology, present potential problem as an environmental pollutant, and such, efficient method their rapid detection must be established. Here, we propose novel type ionic sensor complex detecting CNTs - organic dye that responds sensitively selectively to with photoluminescent signal. complexes are formed...
A detailed experimental and theoretical study of the linear nonlinear absorption a series asymmetrical D–π–A cyanine dyes with same trimethylindolin donor (D) diethylamino-coumarin-dioxaborine acceptor (A) terminal groups different conjugation lengths, is presented. Strong solvatochromic behavior affecting fluorescence quantum yields, lifetimes, properties observed due to presence permanent ground state dipole moments. Detailed studies lifetime dynamics are performed by direct...
Abstract A series of meso ‐polymethine‐substituted BODIPY compounds have been synthesized by the reaction ‐methyl‐3,5‐diphenylboradipyrromethene with a number hemicyanine derivatives. The dyes obtained exhibit intense long‐wavelength absorption, but weak fluorescence. Upon protonation band disappears and intensity short‐wavelength increases significantly. It has shown that properties obtained, which we call boradipyrromethenecyanines, are closely related to those merocyanine rather than...
Abstract A series of dyes bearing polymethine chromophore units in boron dipyrromethene (BODIPY) α‐positions were prepared by condensation 3,5‐dimethyl with various hemicyanines. One or two methyl groups the starting material can react, yielding corresponding mono‐ and disubstituted derivatives. The deeply coloured monosubstituted belong to family merocyanine exhibit spectral properties chemical behaviour similar those meso ‐analogues. On other hand, show more complex absorption spectra...
The two-photon absorption (2PA) spectrum of an organic single crystal is reported. grown by self-nucleation a subsaturated hot solution acetonitrile, and composed asymmetrical donor-π-acceptor cyanine-like dye molecule. To our knowledge, this the first report 2PA crystals made from dye. linear nonlinear properties crystalline material are investigated compared with molecular toluene its monomeric form. maximum polarization-dependent coefficient 52 ± 9 cm/GW, which more than twice as large...
Abstract magnified image A reaction of 3,5‐dimethylborondipyrromethene 3 with the DMF dimethylacetal gives rise to monoenamine 4 . The latter is converted corresponding aldehyde 5 considerable contribution enolic form allows preparing numerous 3‐vinyl substituted borondipyrromethenes and some heterocyclic derivatives. tertiary aliphatic amines consecutive Hofmann‐type decomposition intermediary quaternary salt give dialkylaminovinyl J. Heterocyclic Chem., (2009).
Two versions of a facile and efficient synthetic approach to 3,5-bis(acetaldehyde) substituted BODIPY have been developed this compound has used obtain, in high yields, variety 3,5-divinyl derivatives (vinylacetates, enamines, vinyl chlorides, some multiple-functionalized products). As shown, substituents an additive effect on the position absorption maximum. The dyes synthesized are quite stable exhibit intense fluorescence with wavelengths longer than 600 nm.
The nitrile group in newly synthesized 5‐cyano‐2,2‐difluoro‐4,6‐dimethyl‐1,3,2‐dioxaborine is shown to significantly increase the acidity of methyl groups. This allows cyanine condensation with both groups form D–π–A–π–D dyes which dioxaborine cycle a part polymethine chain. There, reactivity remaining semi‐product reduced enough perform reaction stepwise, giving access nonsymmetric derivatives. synthesis various electron donor termini [indole, benzothiazole, pyran, 4‐(dialkylamino)phenyl]...
Development of novel nanoscale devices requires unique functional nanomaterials. Furthermore, chemical design different nanoparticles in one unit is a complex task, particularly the application self-assembly J-aggregates, which can substantially advance nanomaterial's properties due to resonant delocalization excitons. Here, we have demonstrated for first time formation resonantly coherent J-aggregates on carbon nanotubes with highly efficient energy transfer from aggregates nanotubes. All...
The difluoroboron β-diketonate ring is ever more used for creating bright polymethine-type fluorophores the visible and NIR range. Here, we report synthesis spectral properties of a series dianionic cyanine dyes rare A1–π–A−π–A1 type, with central dioxaborine (A) embedded into polymethine chain various electron-acceptor terminal groups A1. Depending on nature end group, maxima their intensive (with molar extinctions up to 380 000 M–1 cm–1) narrow long-wavelength absorption band lie in range...
A difluorosubstituted aza-boron–dipyrromethene derivative with fully chelated boron atom was synthesized by the reaction of BF3 · Et2O 3,3,5,5-tetraarylazadipyrromethene, which easily prepared from 1,3-diaryl-4-nitro-butan-1-one and ammonium acetate. One fluorine dye substituted pyrrolidine residue. This resulted in a significant bathochromic effect. Ultraviolet absorption fluorescence emission spectra were recorded, quantum yields obtained compounds calculated.
Self-organization of organic molecules with carbon nanomaterials leads to the formation functionalized molecular nanocomplexes advanced features. We present a study physical and chemical properties nanotube–surfactant–indocarbocyanine dye (astraphloxin) in water focusing on aggregation resonant energy transfer from nanotubes. Self-assembly astraphloxin is evidenced absorbance photoluminescence depending dramatically concentrations both surfactant mixtures. observed an appearance new peaks...
A number of polymethine dyes based on a BODIPY nucleus annelated with pyridone ring have been synthesized. The merocyanines this series are long-wavelength and intensive dyes. Obtained for the first time, asymmetrical anionic boradipyrromethenecyanines also interesting from another viewpoint. These compounds able to exist in several equilibrium forms which belong or boradipyrromethene chromophoric systems. This results appearance multicomponent bands absorption fluorescence spectra that may...
Abstract A number of new BODIPY dyes with benzothiazolyl substituents have been synthesized that exhibit long‐wavelength absorption and act as strong fluorophores. The optical properties the were studied by using spectroscopic methods quantum‐chemical calculations. structural peculiarities obtained, in comparison to their analogues, X‐ray analysis.