24 Result(s)
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T. A. Ivanova
Chemistry
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Article
pH-Sensitive Paramagnetic Probe 4-(Methylamino)-2-Ethyl-5,5-Dimethyl-4-Pyridine-2-Yl-2,5-Dihydro-1H-Imidazol-1-Oxyl for Controlling Microacidity Inside Poly-D,L-Lactide Films during Degradation In Vitro
Monitoring of the acidity inside the pores of aliphatic polyesters during their swelling and hydrolysis is important challenge of biomedicine. pH-sensitive nitroxyl radical 5,5-dimetyl- 4-dimetylamino-2-ethyl-...
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Article
The Diffusion of TEMPONE Radical in the Graft Copolymer of N-Isopropylacrylamide with Oligolactide in the Presence of Supercritical Carbon Dioxide by In Situ EPR Method
Impregnation of the thermoresponsive graft copolymer of N-isopropylacrylamide and oligolactide, (P(NIPAM-co-PLA)), with the composition 83.8 : 16.2 wt % with a stable nitroxyl radical, 4-oxo-2,2,6,6-tetramethyl-p...
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Article
Aliphatic Polyesters for Biomedical Purposes: Design and Kinetic Regularities of Degradation in vitro
This paper presents a brief review of the methods for creating and diagnosing materials based on aliphatic polyesters used to create temporary prostheses and dosage forms of prolonged action. After a review of...
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Article
Kinetics of Release of a Bifunctional 2,2,5,5-Tetramethyl-4-Phenyl-3-Imidazoline-1-Oxyl-3-Oxide Probe from Poly-D,L-Lactide Films Formed Using Supercritical Carbon Dioxide
Optical spectroscopy and ESR spectroscopy were used for the first time to quantitatively describe the release of a nitroxyl probe from poly-D,L-lactide (PDLLA) films into phosphate buffer. The bifunctional pro...
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Article
Kinetics of Release of the TEMPONE Nitroxyl Radical from Poly-D,L-Lactide Foamed in the Supercritical Carbon Dioxide Medium
Abstract—The electron spin resonance method was used to quantitatively describe the release of a paramagnetic bioactive substance from a biodegradable polymer matrix. A standard spin probe TEMPONE was chosen as t...
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Article
Features of the Magnetic Properties of the [Fe(salen)(2-Me-Him)]n Chain Structure
The iron(III) compound of composition [Fe(III)(salen)(2-Me-Him)]n, where H2salen = N, N′-ethylenebis(salicylaldimine) and 2-Me-Him = 2-methylimidazolate bridging ligand, was prepared. Magnetic resonance and magne...
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Article
EPR Diagnostics of D,L-Polylactide Porous Matrices Formed in Supercritical CO2
The regularities of formation of D,L-polylactide porous matrices in supercritical CO2 environment with simultaneous impregnation with paramagnetic biologically active 4-hydroxy-2,2,6,6-tetramethylpiperidine- 1-ox...
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Article
Properties of [Fe(Salten)Cl] Being a Precursor for Spin-Crossover Compounds in Polycrystals and Vitrified Acetonitrile Solutions
The complexes of precursor with pentadentate Salten ligand has been shown to have high-spin state (S = 5/2) in a single crystal and polycrystalline phase and contain both high-spin and low-spin (S = 1/2) fraction...
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Article
Intermolecular interactions and spin states of complexes [Fe(3-MeO-Qsal)2]Y (Y = PF6, BF4)
Compounds [Fe(3-MeO-Qsal)2]Y (Y = PF6, BF4) have been prepared by diffusion method and studied in temperature range 5–300 K by EPR and magnetic susceptibility methods. The coexistence of spatially separated high-...
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Article
Lability of spin state of Fe(III) complexes with tetradentate Schiff’s bases
[FeLX2]Y [L = N,N'-ethylenebis(salicylimine) (salen), N,N'-ethylenebis(acetylacetonylimine) (acen), or N,N'-ethylenebis(3-methyloxysalicylimine) (vanen); X = imidazole or N-methylimidazole; Y = BF4, ClO4, or BPh4
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Article
ALON: Synthesis and thermal properties
The aluminum oxynitride γ phase was synthesized by the high-temperature sintering of aluminum oxide and nitride. The effect of synthesis conditions, first of all, temperature, pressure, and time, on the compos...
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Article
Preparation and liquid-crystalline properties of mono- and binuclear complexes of Fe(III) with pentadentate Schiff’s base
Liquid-crystalline mono-and binuclear complexes of Fe(III) based on pentadentate Schiff’s base, N,N′-bis(2-hydroxy-4-octadecyloxybenzyliden)-1,7-diamino-4-azaheptane, have been prepared for the first time. The ef...
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Article
Thermo- and photoinduced properties of the Fe(III) complexes with the pentadentate ligand according to the EPR data
Compounds [Fe(Salten)L]BPh4 (Salten = N,N-bis[(2-oxyphenyl)methylene]-4-azaheptane-1,7-diamine; L = Him (I) and Pic (II)) were studied by the EPR method in the temperature range from 5 to 300 K. The thermoinduced...
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Article
Synthesis and magnetic properties of the complex of 3-acetylquinoxalin-2(1H)-one with Cu(II)
The complex CuHL(NO3)2 · H2O, where HL = 3-acetylquinoxalin-2(1H)-one was synthesized and studied. Elemental analysis, magnetochemistry, and ESR, electronic, and IR spectroscopy were used to show that this comple...
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Article
Water-Soluble Polymers of Acrylamide as Labeling Adhesives
The adhesive and rheological properties of high- and low-molecular-weight polyacrylamides and the products of their partial hydrolysis were studied. The suitability of the hydrolyzates of high-molecular-weight...
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Article
Phosphorylation of trivalent metal tris(3-bromo-2,4-pentanedionates)
Reactions of chromium(III) and cobalt (III) tris(3-bromo-2,4-pentandionates) with sodium dibutyl phosphate, sodium dibutylphosphinate, sodium dibutyl dithiophosphate, and sodium dibutyldithiophosphinate were s...
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Article
Macrocyclic amidophosphoryl polyethers: Biological activity, molecular structure, and structure of the complex with calcium thiocyanate
The antihypoxic and anticonvulsant activity of eight new amidophosphoryl derivatives of crown ethers was investigated. It was found that some of them exhibit pronounced antihypoxic activity. The results of an ...
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Article
Possible use of low-frequency esr to estimate the quadrupole coupling constant in copper(II) complexes in vitreous media
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Article
The molecular weight distribution as a factor in the viscosity of cellulose triacetate solutions
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Article
Indoles
Dinordeoxy-10-methylhomoeseroline and a number of its derivatives, substituted in the benzene ring and at the indole nitrogen atom, were obtained by condensation in neutral, aqueous alcoholic solutions of aryl...
