Metal-polymer complexes of cobalt(II) and Copper(II) with hyperbranched polyester polycarboxylic acids

Hyperbranched polyester polycarboxylic acids of the second and third generations for use as high-efficiency complexing agents are synthesized. On the basis of these compounds, new metal-polymer complexes of cobalt(II) and copper(II) are prepared for the first time. As evidenced by IR and ERR studies, the central atom in these metal polycarboxylates occurs in the axially symmetric system MO₆. The thermal stability of polymer copper complexes is improved with increases in the content of metal ions, the degree of functionalization, and the generation number of the polyacid platform.     

Synthesis of Ethyl 2,2-Bis{[(benzoylcarbamothioyl)oxy]methyl}propanoate and Its Complexes with Copper(II) and Cobalt(II) Ions

Russian Journal of General Chemistry - The structures of ethyl 2,2-bis{[(benzoylcarbamothioyl)oxy]methyl}propanoate and its 1 : 1 complexes with copper(II) and cobalt(II) ions were determined by...     

Structure of hyper-branched polyester polyol BOLTORN H2O-COOH. NMR data

The methods of one- and two-dimensional ¹H and ¹³C NMR spectroscopy have been used to study the structure of hyper-branched polyester polyol BOLTORN H2O-COOH and complex Co₁₂[BH20(COOH)] on its basis. It was shown that both compounds have non-stereoregular structure. Paramagnetic ions Co(II) are coordinated both on the surface of the molecule and near the core.     

Reaction of 2-chloroethyl isothiocyanate with N-phenylethyleneimine and ethylene sulfide

The reaction of 2-chloroethyl isothiocyante with N-phenylethyleneimine in the presence of triethylamine gives 2-(2-chloroethyl)imino-3-phenyl-1,3-thiazolidine. A mixture (12) of 2-(2-chloroethyl)imino-3-phenyl-l,3-thiazolidine and 7-phenyl-2,3,5,6-tetrahydroimidazo-[2,1-b]thiazolinium chloride is obtained in the absence of a catalyst. The reaction of 2-chloroethyl isothiocyanate with ethylene sulfide in the presence of triethylamine gives 2,3,5,6-tetrahydrothiazolo[2,3-b]thiazolinium chloride, while the reaction with tetraethyl-ammonium bromide gives 2-ethyleneiminium-l,3-dithiolane chloride.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1651–1653, December, 1971.     

New adsorbent based on zeolite modified with hyperbranched polyesterpolybenzoylthiocarbamate

A new hybrid adsorbent based on zeolite modified with hyperbranched polyesterpolybenzoylthiocarbamate is presented. The structure and morphology of the sorbent are characterized by potentiometric titration, IR, ¹H and ¹³C NMR spectroscopy, and electron microscopy. The fundamental possibility of extracting transition metal ions has been demonstrated using the examples of Cu^II and Co^II ions. It is shown that the sorption capacity of the adsorbent to Cu_II salt is 25.34 mg g^?1. A method of sorbent regeneration is proposed.

     

Coordination properties of N-(Thio)phosphorylated thioureas and thioamides with respect to Co(II), Ni(II), Zn(II), and Cd(II) ions in solution

The acid-base and coordination properties of N-(thio)phosphorylated thioureas and thioamides R¹C(X)NHP(Y)R ₂ ² , where X, Y = S, O (in various combinations); R¹ = t?Bu, i-Pr, PhNH, Ph; R² = (OPr?i), with respect to Co(II), Ni(II), Zn(II), and Cd(II) ions have been studied by pH-metry and UV spectrometry in an organic solvent. The pK values, the stability constants logβ and the maximum accumulated fractions of complex species in the solution have been calculated.     

Hyperbranched polyesterpolyols as components of amperometric monoamine oxidase biosensors based on electrodes modified with nanomaterials for determination of antidepressants

The use of hyperbranched polyesterpolyols of different generations favors firmer fixation of carbon nanotubes and silver nanoparticles as components of composite materials on the electrode surface (0.028 mg cm^–2), which improves the operation characteristics of monoamine oxidase biosensors. The size of silver nanoparticles (18–52 nm) depends on the conditions for preparing hyperbranched polyesterpolyols, and their use as electrode modifiers influences the analytical possibilities of amperometric biosensors. Silver nanoparticles (18 nm, data of atomic force microscopy) in polyesterpolyols of third generation (pH 10.0) as components of the developed biosensors extend the interval of determinable concentrations to 1 × 10^–4–1 × 10^–8 M and decrease the lower limit of determination to 3 × 10^–9 M, compared to the unmodified sensors, owing to enhancement of the analytical signal. The developed biosensors were tested in monitoring of drugs (antidepressants) in Coaxil and Auroriks drug forms with the relative standard deviation on the level of 0.052.     

Reactions of ferrocene with phthalonitrile on the surface of oxide powders

The reaction of ferrocene with phthalonitrile at 200°C in a vacuum in the absence of solvents forms crystals of the monoclinic phthalocyanine β phase and ferrocene polymerization products. The use of oxide powders (SiO₂, V₂O₅) as a surface for the reaction of ferrocene with phthalonitrile makes it possible to obtain iron phthalocyanines. The samples of pure compounds and deposited phthalocyanine complexes were analyzed by electronic absorption and IR spectroscopy, and X-ray diffraction.     

Metallomicellar Complex of 1-Hexadecyl-4-aza-1-azoniabicyclo-[2.2.2]octane Bromide with Copper Dibromide for Solubilization of Nitrofurantoin

Associates of amphiphilic 1-hexadecyl-4-aza-1-azoniabicyclo[2.2.2]octane bromide–copper dibromide complex solubilize nitrofurantoin (furadonin). The solubilizing capacity of premicellar aggregates with respect to nitrofurantoin is 15 times higher than that of micelles and is considerably higher (by a factor of 5–16) than the solubilizing effect of micellar solutions of the complex, ligand, and conventional cationic surfactants with respect to Orange OT.