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Article
Nonlinear-Optical Properties of Polyfluorotriphenylpyrazoline-Dicyanoisophorone Dyes in a Polycarbonate Matrix
Results of experimental works on studying concentration dependences and temporal and thermal stability of the quadratic response of guest–host materials based on polycarbonate and original synthesized dyes are...
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Article
Determining Poling Conditions of Chromophore–Polymer Films in the Field of Corona Discharge by Measuring Signal of Generation of Second Harmonic
Using the experimental setup for poling film samples with capability of continuous monitoring of generation signal of second harmonic, the conditions of effective orientation of chromophore molecules based on ...
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Article
Formyl Derivatives of Amino-Substituted Polyfluorotriphenyl-4,5-dihydro-1H-pyrazoles: Synthesis and Use as Donor Blocks of Nonlinear Optical Chromophores
A series of new formyl derivatives of polyfluorinated triphenyl-4,5-dihydro-1H-pyrazoles containing various amine residues in the fluorinated benzene ring have been synthesized and used as donor building blocks i...
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Article
Synthesis and nonlinear optical properties of donor-acceptor dyes based on triphenylpyrazolines as a donor block and dicyanoisophorone as acceptor
A series of donor-acceptor dyes based on polyfluoro-substituted triarylpyrazolines (as a donor block) and a dicyanoisophorone group (as an acceptor) were synthesized using the Knoevenagel condensation. The dye...
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Article
Luminescence detection of vapors of primary aliphatic amines at low concentrations using pyrylocyanine chromophores
The method for the gas-phase detection of primary aliphatic amines using silica nanoparticles modified with pyrylocyanine chromophores is proposed. The luminescence quantum yields of three new pyrylocyanine dy...
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Article
Synthesis of unsymmetrical thioflavylium dyes from julolidine derivatives and polyfluorinated triphenyldihydropyrazoles
Unsymmetrical polymethine dyes have been synthesized from 6-tert-butyl-4-methylthioflavylium perchlorates and nitrogen-containing heterocyclic aldehydes derived from julolidine and polyfluorinated triphenyl-4,5-d...
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Article
Reactions of α-perfluorophenylpyrylium salts with phenylhydrazine
Reactions of α-perfluorophenylpyrylium salts with phenylhydrazine in ethanol give acyclic phenylhydrazones, which undergo rearrangement into phenacylpyrazolines in boiling ethanol. Transformations of phenylhyd...
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Article
Detection of anilines by luminescence spectroscopy using dissolved and adsorbed pyrylocyanine dyes
Reactions of three pyrylocyanine dyes (derived from 2,4,6-trimethylpyrylium perchlorate) with p-toluidine and 2,4-diaminotoluene were studied to develop methods for detection of aromatic amines. The emission spec...
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Article
Fiber-optic chemical sensor of amine-type compounds
A scheme of a fiber chemical sensor of amine-type compounds has been implemented. The sensor includes a film nanostructure deposited on the end face of an optical fiber 600 μm in diameter. The film consists of...
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Article
Reactions of α-perfluorophenylpyrylium perchlorates with hydrazine hydrate
Reactions of α-perfluorophenylpyrylium salts with hydrazine hydrate in ethanol afforded derivatives of 1,2-diazepine, dihydro-1H-pyrazole, and/or 1-aminopyridinium salts, depending on the steric characteristics o...
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Article
Luminescent silica nanoparticles modified with a functional pyrylocyanine dye
A method was developed for the chemical modification of silica nanoparticles with a pyrylium dye under the sol-gel synthesis conditions. The films of silica particles modified with a pyrylium dye gave greenish...
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Article
Reactions of α-pentafluorophenylpyrylium salts with hydroxylamine
The reactions of α-pentafluorophenylpyrylium salts with hydroxylamine in ethanol afford isoxazoline derivatives and/or pyridine N-oxides depending on the steric characteristics of the substituent in the second α ...
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Article
Reactions with Methylamine of Pyrilo-2-cyanines Containing Polyfluorophenyl Substituents
Reactions of symmetric and unsymmetrical pyrilo-2-cyanines containing polyfluorophenyl substituents with methylamine give rise to the corresponding pyridocyanines, 1,3-cyclohexadiene derivatives, or 1-methyl-2...
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Article
Pyrilocyanines. 37. Pyrilo-2-cyanines with perfluorophenyl substituents
Symmetrical and nonsymmetrical pyrilo-2-cyanines have been synthesized containing the 6-perfluorophenyl-4-phenylpyrilium residue. As an example of these compounds we have analyzed the effect of chnging phenyl ...
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Article
2-[2-(Dimethylamino)vinyl]-6-pentafluorophenyl-4-phenylpyrylium perchlorate and its hydrolysis products: Synthesis and isomerism
2-(2-(Dimethylamino)vinyll-6 pentafluorophenyl-4-phenylpyryliunt perchlorate has been synthesized and it was shown that it is readily converted into 2-fornrylntethylene-6-pentafluorophenyl-4-phenyl-2H-pyran on...
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Article
Synthesis of N-methylpentafluorophenylpyridinium salts
Di- and triaryl-N-methylpyridinium perchlorates bearing pentafluorophenyl groups have been obtained by reaction of the appropriate pyrylium salts with methylamine. In the case of 4-phenyl-2,6-bis(pentafluoroph...
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Article
Reaction of polyfluoroaromatics with o- and p- aminophenols in DMF
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The reaction of pentafluorobenzene with o- and p-aminophenols can lead to the corresponding hydroxydiarylamin...
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Article
Synthesis of polyfluorophenoxazines: Smiles' rearrangement activated by fluorine atoms
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Two methods have been described for the preparation of 1,2,4-trifluoro-3-X-phenoxazines (X=H, Cl) from pentaf...
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