SYNTHESIS OF MACROCYCLES FROM COMPLEX NICKEL SALTS

Исследовано взаимодействие комплексной соли хлорида никеля (II) с диаминомочевиной в присутствии глиоксаля. Получены различные комплексные соли катионного типа на основе никеля (II) с диаминомочевиной и на их основе были синтезированы соответствующие макроциклические соединения. Полученные комплексы и макроциклы исследованы физико-химическими методами анализа. The interaction of a complex salt of nickel (II) chloride with diamino urea in the presence of glyoxal was studied. Various complex salts of the cationic type based on nickel (II) with diamino urea were obtained and the corresponding macrocyclic compounds were synthesized on their basis. The resulting complexes and macrocycles were studied by physicochemical methods of analysis.

Protective properties of the nickel (II) complex with tryptophan

Aim. The synthesized and characterized of the complex nickel (II) with tryptophan [NiL2 (H2O)2]; L = Trp. It is shown that the composition of the complex obtained depends on the ratio of the initial components. Methods. The composition and structure of the complex were studied by elemental, TG/DrTG-DTA analysis and IR spectroscopy. The method of IR showed that the ligand in the composition of the metal complex enter the neutral form and coordinate with the complexing agent through the nitrogen atom. Results. The results of thermogravimetric studies have shown that the final product of the thermal decomposition of all compound is metal oxide, respectively. Conclusions. Have been studied the biological properties – the toxicity has been evaluated, the influence of the complex on the resistance to hypoxia and ant radiation activity has been determined. Keywords: tryptophan, nickel, tryptophan-metal complexes, amine groups, IR spectroscopy, thermogravimetry, toxicity, antiradiation activity.

Study on Ultrasonically-Enhanced Sulfuric Acid Leaching of Nickel from Nickel-Containing Residue

In this paper, nickel-containing residue, a typical solid waste produced in the battery production process, was used to study the cavitation characteristics of ultrasonic waves in a liquid–solid reaction. The ultrasonically-enhanced leaching technology for multicomponent and complex nickel-containing residue was studied through systematic ultrasonic-conventional comparative experiments. An ultrasonic leaching kinetics model was established which provided reliable technological guidance and basic theory for the comprehensive utilization of nickel-containing residue. In the study, it was found that ultrasonically-enhanced leaching for 40 min obtained the same result as conventional leaching for 80 min, and the Ni extraction degree reached more than 95%. According to the kinetic fitting of the leaching process, it was found that the sulfuric acid leaching process belonged to the diffusion-controlled model of solid product layers under conventional and ultrasonic conditions, and the activation energy of the reaction was Ea1 = 17.74 kJ/mol and Ea2 = 5.04 kJ/mol, respectively.

SILICA GEL MODIFICATION BY NICKEL(II) COMPLEXES WITH NITROGEN- AND OXYGEN-CONTAINING ORGANIC LIGANDS FOR GAS CHROMATOGRAPHY

Gas chromatographic sorbents based on Siloсhrome S-80 adsorptively modified with 8-hydroxyquinolinate, 1-phenylazo-2-naphtholate and 2-nitroso-1-naphtholate of nickel(II) have been obtained. It has been established that the thermal stability (up to 170–350 °C) of chelate-containing sorbents is sufficient for carrying out gas chromatographic separations. The IR and Raman spectra of the obtained materials confirmed the success of the complexation processes in the synthesis of complex nickel(II) compounds and the retention of coordination bonds after the deposition of chelates on silica gel. The characteristics of the surface and the porous structure of the prepared sorbents are investigated. As a result of adsorptive modification of Silochrome S-80 with nickel(II) chelates, it’s specific surface area (84 m2/g) decreases by 12–32 m2/g along with a decrease in the average pore size, which indicates the fixation of modifiers at the edges of large pores. It was shown that modification of Silochrome S-80 with 8-hydroxyquinolinate, 1-phenylazo-2-naphtholate, 2-nitroso-1-naphtholate of nickel(II) has a significant effect on the chromatographic polarity and selectivity of sorbents. The presence of a polar nitroso-groups in the composition of nickel(II) 2-nitroso-1-naphtholate makes the metal center more accessible for donor-acceptor interactions with sorbates (pyridine, carbonyl compounds). Also, the nitroso-group is active in the formation of hydrogen bonds with alcohols, which complicates their elution at column temperatures below 170 °C. The greatest affinity to the homologous of arenes is shown by silochrome modified by a nickel(II) complex with the least bulky 8-hydroxyquinolinate ligands, which leads to an increase in the retention times of aromatic and polyaromatic compounds along with an increase of the sorbent selectivity. The possibility of practical application of a chromatographic column filled with Silochrome S-80 with deposited nickel(II) 8-hydroxyquinolinate for gas chromatographic (FID) separation of mixtures of polyaromatic compounds in the temperature programming mode is shown.

Removal of Arsenic(III) Ion from Aqueous Media Using Complex Nickel-Aluminum and Nickel-Aluminum-Zirconium Hydroxides

The technology of wastewater treatment involving removal of heavy metals using complex metal hydroxides is reported. In this study, complex nickel-aluminum (NA11 and NA12) and nickel-aluminum-zirconium (NAZ1 and NAZ2) hydroxides were prepared for the removal of arsenite ions, As(III), from aqueous solution. The characteristics of each adsorbent were evaluated, and the adsorption capacity and adsorption mechanism were determined. The adsorption capacity of As(III) on NAZ1 (15.3 mg g−1) was greater than that on NA11 (9.3 mg g−1). Coverage is directly related to the specific surface area with a correlation coefficient of 0.921. Ion exchange involving sulfate ions in the interlayer of the adsorbent also plays a role in the mechanism of As(III) adsorption as demonstrated by correlation coefficients of 0.797 and 0.944 for the NA11 and NAZ1, respectively. The results demonstrate the usefulness of NAZ1 in removing As(III) from aqueous media.

Synthesis of the first nickel borate nitrate K7Ni[B18O24(OH)9](NO3)6· (H3BO3)

The novel potassium nickel borate nitrate K7Ni[B18O24(OH)9](NO3)6 ·(H3BO3) was obtained from a simple hydrothermal synthesis in a stainless-steel autoclave at T = 513 K starting with nickel dichloride hexahydrate, and boric and nitric acid with the pH adjusted to 8 by KOH. Single-crystal X-ray diffraction data provided the basis for the structure analysis and refinement. The compound crystallizes in the trigonal space group R3̅ (no. 148) with the lattice parameters a = 1222.29(8) and c = 5478.4(4) pm. Generally, K7Ni[B18O24(OH)9](NO3)6 ·(H3BO3) is comprised of nitrate layers and complex nickel borate layers surrounded by boric acid, nitrate anions, and potassium cations.