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Journal of the Belarusian State University. Chemistry最新文献

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Solvothermal synthesis of metastable molybdenum, tungsten and vanadium oxides 溶剂热合成亚稳钼、钨、钒氧化物
Journal of the Belarusian State University. Chemistry Pub Date : 2020-03-05 DOI: 10.33581/2520-257x-2020-1-32-39
T. Sviridova
{"title":"Solvothermal synthesis of metastable molybdenum, tungsten and vanadium oxides","authors":"T. Sviridova","doi":"10.33581/2520-257x-2020-1-32-39","DOIUrl":"https://doi.org/10.33581/2520-257x-2020-1-32-39","url":null,"abstract":"It is shown that under the solvothermal conditions the polycondensation of molybdic, tungstic and vanadic oxoacids yields metastable oxide phases (h-MoO3, h-WO3, xerogel-V2O5 of lamellar structure) in the form of microcrystals 2–10 μm in size, while the hydrates of these oxides formed as the by-products exhibiting conversion as the result of recrystallization during the course of further growing. By changing the concentration of the reaction solution it is possible to exert an effective control over the nucleation to obtain the oxide particles of the similar structure and habitus.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89860374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The development of methods for the determination of residues of the insecticide pymetrozine in water, soil, cucumber and rape 建立了吡蚜酮在水、土壤、黄瓜和油菜中的残留量测定方法
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-30 DOI: 10.33581/2520-257x-2019-2-79-87
M. Zayats, S. Leschev
{"title":"The development of methods for the determination of residues of the insecticide pymetrozine in water, soil, cucumber and rape","authors":"M. Zayats, S. Leschev","doi":"10.33581/2520-257x-2019-2-79-87","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-79-87","url":null,"abstract":"Based on the literature data on the solubility of pymetrozine in water and organic solvents, as well as experimental data on the extraction of pymetrozine from water, soil and plant matrices, the optimal conditions for the extraction of pymetrozine from water; soil; cucumber; rape seeds, oil and green pods were selected. The conditions for cleaning extracts were selected as well. At the first stage, acetonitrile, a mixture of dichloromethane – isopropanol, or a mixture of dichloromethane – methanol in the presence or absence of inorganic salts were used for extraction of the pesticide. Pymetrozine was found to be a highly hydrophilic substance. For the purification of extracts of pymetrozine from plant matrices the extraction systems hexane – 0.02 mol/L aqueous solution of orthophosphoric acid, hexane or chloroform – aqueous solutions of ammonium sulfate were successfully used. The samples, obtained after this treatment, were pure enough to determine the residual amounts of pymetrozine in them at the maximum residue level (MRL), determined in Russia and the countries of the European Union, or lower using widespread liquid chromatography with diode-array (ultraviolet) detection.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80715874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IR-spectrum of monometallic copper(II) halogenide complexes with 1-tert-butyl-1,2,4-tria zole: experimental and quantum chemical studies 1-叔丁基-1,2,4-三唑单金属卤化铜配合物的红外光谱:实验和量子化学研究
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-30 DOI: 10.33581/2520-257x-2019-2-12-20
Djennet S. Saparova, A. N. Bogatikov, V. Matulis, M. M. Degtyarik
{"title":"IR-spectrum of monometallic copper(II) halogenide complexes with 1-tert-butyl-1,2,4-tria zole: experimental and quantum chemical studies","authors":"Djennet S. Saparova, A. N. Bogatikov, V. Matulis, M. M. Degtyarik","doi":"10.33581/2520-257x-2019-2-12-20","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-12-20","url":null,"abstract":"The crystalline complexes CuL2X2 and CuL4X2 , where X = Cl or X = Br were synthesized by the interaction of copper(II) chloride or bromide with 1-tert-butyl-1,2,4-triazole (L) in water or organic solvents. The structure of metal complexes have been studied by elemental analysis, X-ray analysis and IR-spectroscopy in the medium (4000 –500 cm –1 ) and long-wavelength (400–50 cm –1 ) regions. Quantum chemical calculations of the vibrational spectra of the CuL2Cl2 and CuL4Cl2 complexes have been carried out to perform the assignment of the signals in the IR-spectra. It is shown that the polymer structure of CuL2X2 complexes is formed due to bridging of one of their halide ions. In the CuL4X2 complexes, the halide ions and 1-tert-butyl-1,2,4-triazole form an island type structure. In all metal complexes 1-tert-butyl-1,2,4-triazole is coordinated by N(4) atom of heterocycle.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87078052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Compo­sition, structure and properties of electroless deposited nickel – phosphorus – copper coatings 化学沉积镍磷铜镀层的组成、结构和性能
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-30 DOI: 10.33581/2520-257x-2019-2-62-68
L. S. Tsybul’skaya, S. Perevoznikov, V. Shendyukov
{"title":"Compo­sition, structure and properties of electroless deposited nickel – phosphorus – copper coatings","authors":"L. S. Tsybul’skaya, S. Perevoznikov, V. Shendyukov","doi":"10.33581/2520-257x-2019-2-62-68","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-62-68","url":null,"abstract":"The nickel – phosphorus – copper functional coating was deposited on aluminum alloys substrate by chemical deposition method from malonate­glycinate nickel plating solution. The chemical and phase coatings composition was studied by X­ray fluorescence and X­ray phase analyze. Thermally stimulated phase transitions in deposited Ni – P – Cu coating were detected by differential scanning calorimetry method. The annealing at 250 and 400 °С was shown to lead to the changes in coating structure involving the transition from amorphous to amorphous­crystalline at 250 °С and to crystalline at 400 °С with Ni and Ni3P1 –  δ phases forming. Changes in the structure of Ni–P coating results in the increase of microhardness by 1.6–1.7 times and wear resistance by 3– 4 times. Annealing at 400 °С led to decreasing of corrosion stability of the coatings in 3.5 % sodium chloride solution. The optimum physical, mechanical and protective properties has the attained in the case of Ni – P – Cu coating annealed at 250 °C.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88771526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of functionalized polyisobutylene and its block copolymers with D,L-lactide 功能化聚异丁烯及其与D, l -丙交酯嵌段共聚物的合成
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-30 DOI: 10.33581/2520-257x-2019-2-40-50
P. Nikishau, E. Ksendzov, D. Shiman, L. V. Gaponik, S. Kostjuk
{"title":"Synthesis of functionalized polyisobutylene and its block copolymers with D,L-lactide","authors":"P. Nikishau, E. Ksendzov, D. Shiman, L. V. Gaponik, S. Kostjuk","doi":"10.33581/2520-257x-2019-2-40-50","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-40-50","url":null,"abstract":"Method of reactive polyisobutylene modification by various alkoxybenzenes (anisole and 4-phenoxybutanol) was proposed to form functionalized polyisobutylenes. Polymerization of D,L-lactide was explored on the 4-phenoxybutanol/1,5,7-triazabicyclo[4.4.0]dec-5-ene system. It led to determination of optimal conditions for gaining of poly(isobutylene-b-D,L-lactide). Such copolymers (Mn = 14 300 g/mol and Mn = 36 600 g/mol, Mw /  Mn ≤ 2.5) which were obtained by the polymerization of D,L-lactide on polyisobutylene macroinitiator shows microphase ordering. Formation of the block copolymers is confirmed by 1Н NMR spectroscopy, gel permeation chromatography, and scanning electron microscopy.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76824650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Biopharmaceutical aspects of techno­logy of wound­healing gels containing silver(I) complex with 2-­(4,6-­di-­tert-­butyl-­2,3-­dihydroxyphenylsulphanyl)acetic acid 含银(I)与2—(4,6—二叔—丁基—2,3—二羟基苯基磺胺基)乙酸配合物的伤口愈合凝胶的生物制药技术
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-30 DOI: 10.33581/2520-257x-2019-2-29-39
H. Harbatsevich, Sergei I. Stakhevich, N. Loginova, G. Ksendzova, N. Osipovich, I. N. Slabko, V. V. Butkevich, Zhanna A. Makarevich, Lyudmila V. But'ko
{"title":"Biopharmaceutical aspects of techno­logy of wound­healing gels containing silver(I) complex with 2-­(4,6-­di-­tert-­butyl-­2,3-­dihydroxyphenylsulphanyl)acetic acid","authors":"H. Harbatsevich, Sergei I. Stakhevich, N. Loginova, G. Ksendzova, N. Osipovich, I. N. Slabko, V. V. Butkevich, Zhanna A. Makarevich, Lyudmila V. But'ko","doi":"10.33581/2520-257x-2019-2-29-39","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-29-39","url":null,"abstract":"The object of the work is to develop optimal composition of a gel with wound­healing ability based on Ag(I) complex with 2­(4,6­di­tert­butyl­2,3­dihydroxyphenylsulphanyl)acetic acid to produce a novel effective remedy. It was found that propylene glycol (PG) favours the formation of more fine suspension of Ag(I) complex, and introduction of polyvinylpyrrolidone (PVP) hinders aggregation of the particles of the complex, thus providing optimal dispersity of the gel suspension. The gels based on methyl cellulose (MC) are characterized by an acceptable degree of release of Ag(I) complex. It is the gels containing PG and PVP that are characterized by the most complete release of the active substance, which is in agreement with the data on the optimal dispersity. It was found that PG and PVP being introduced into the gel composition increase the osmotic activity of the gel considerably. The optimal composition of the ointment base was determined, %: MC – 3.5; PVP – 5.0; 0.1 mol/L citric acid solution – 5.0; PG – 20.0; water for injections – up to 100.0. The gel obtained was shown to surpass «Dermazin» cream and «Levomecol» ointment in wound­healing ability, while the content of the active substance was significantly lower (0.5 %), and to promote wounds to be cleansed of microorganisms fast and completely too. No accumulation of silver in the liver was found when the gel was used medicinally.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90576207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrodeposition of copper – tin alloys from glycol electrolytes 乙二醇电解液电沉积铜锡合金
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-30 DOI: 10.33581/2520-257x-2019-2-69-78
T. N. Vorobyova, Maryia G. Haluza, Olga N. Vryblevskaya, A. V. Paniatouski, E. A. Veretennikova
{"title":"Electrodeposition of copper – tin alloys from glycol electrolytes","authors":"T. N. Vorobyova, Maryia G. Haluza, Olga N. Vryblevskaya, A. V. Paniatouski, E. A. Veretennikova","doi":"10.33581/2520-257x-2019-2-69-78","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-69-78","url":null,"abstract":"Stable ethylene glycol (EG) and propylene glycol (PG) electrolytes containing СuCl2 · 2H2O, SnCl4 · 5H2O and Trilon B have been developed, which provide electrodeposition of Cu – Sn alloy with tin content varying from 34 to 52 at. % in case of EG and from 51 to 91 at. % in case of PG electrolytes. It is found that the coatings contain phases of Cu6Sn5 и Cu10Sn3 intermetallic compounds, and metallic tin is also present in case of its highest content in the alloy. It is revealed that tin content can be simply varied by the change of current density or concentrations of tin and copper compounds in glycols. The effect of electrolyte composition, deposition conditions, a nature of a substrate on the coatings deposition rate (in the limits of 0.9‒2.9 μm ∙ h‒1), total metal current efficiency (from 40 to 95 %), the ratio of metals in the alloy (from 34 to 91 at. %), its phase composition and microstructure is determined. The conditions for the deposition of Cu – Sn alloy close to the eutectic composition have been found.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84009442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Formation of laterally-oriented monolayers of plasmonic silver nanoplats and their ensembles with cadmium selenide quantum dots on the sur face of thin polymeric film 等离子体银纳米片横向定向单层的形成及其与薄聚合物膜表面硒化镉量子点的集成
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-30 DOI: 10.33581/2520-257x-2019-2-21-28
P. Malakhovsky, M. Artemyev
{"title":"Formation of laterally-oriented monolayers of plasmonic silver nanoplats and their ensembles with cadmium selenide quantum dots on the sur face of thin polymeric film","authors":"P. Malakhovsky, M. Artemyev","doi":"10.33581/2520-257x-2019-2-21-28","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-21-28","url":null,"abstract":"We present here a novel method for formation of laterally-oriented monolayers of plasmonic silver nanoplates and their electrostatic ensembles with semiconductor quantum dots. Monolayers were electrostatically deposited on the surface of thin polymeric film containing different amount of tertiary amino groups. This method allows simultaneously investigate optical properties and morphology of silver nanoplates using transmittance electron microscopy. The optical density of films and surface concentration of silver nanoplates is proportional to the percentage of tertiary amino groups in the polymeric film. A surface ligand exchange was used for functionalization of the surface of silver nanoplates toward formation of electrostatic ensembles with colloidal quantum dots. We observed a straight correlation between the red shift of surface plasmon resonances in silver nanoplates and alkyl chain length of ligand molecules.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80944254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of structure and properties of platinum(II) chloride complexes with (2-alkyltetrazol-5-yl)acetic acid by quantum chemistry and NMR-spectroscopy methods 用量子化学和核磁共振光谱方法研究氯化铂与(2-烷基四唑-5-基)乙酸配合物的结构和性质
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-30 DOI: 10.33581/2520-257x-2019-2-3-11
V. Matulis, Ekaterina G. Ragoyja, T. V. Serebryanskaya, Yuri V. Grigoriev, O. Ivashkevich
{"title":"Study of structure and properties of platinum(II) chloride complexes with (2-alkyltetrazol-5-yl)acetic acid by quantum chemistry and NMR-spectroscopy methods","authors":"V. Matulis, Ekaterina G. Ragoyja, T. V. Serebryanskaya, Yuri V. Grigoriev, O. Ivashkevich","doi":"10.33581/2520-257x-2019-2-3-11","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-3-11","url":null,"abstract":"It has been shown that the WP04 functional in combination with moderate basic sets 6-31G(d) and SDD allows to calculate characteristics of 1H NMR-spectrum of metal complexes with ligands based on tetrazole derivatives with high accuracy, which can be used to assign signals in the NMR-spectra. The process of hydrolysis of the isomeric platinum(II) chloride complexes with (2-isopropyltetrazol-5-yl)acetic acid has been investigated using the methods of quantum chemistry and NMR-spectroscopy. An explanation of the changes of signals in the 1H NMR-spectra of the considered complexes during their hydrolysis is given.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80626520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrochemical synthesis of Sn–Ag alloy coatings in sulphate solution 硫酸盐溶液中Sn-Ag合金镀层的电化学合成
Journal of the Belarusian State University. Chemistry Pub Date : 2019-08-15 DOI: 10.33581/2520-257x-2019-2-51-61
O. Vrublevskaya, M. Shikun
{"title":"Electrochemical synthesis of Sn–Ag alloy coatings in sulphate solution","authors":"O. Vrublevskaya, M. Shikun","doi":"10.33581/2520-257x-2019-2-51-61","DOIUrl":"https://doi.org/10.33581/2520-257x-2019-2-51-61","url":null,"abstract":"The optimal conditions for the electrochemical synthesis in the sulfate electrolyte of low-melting Sn–Ag alloy coatings used in the assembly of electronic equipment containing 7.1–8.3 at. % of silver and with total current yield of metals equal to 88.8–87.0 % are determined. It is established that electrochemical reduction of Sn(II) and Ag(I) on the surface of the alloy is accompanied by the process of contact displacement of Ag(I) with tin included into the coating. The process of contact displacement is intensified with the electrolyte temperature growth and leads to the increase in silver content in the alloy, to the appearance of dendrites on the surface of the coating due to its passivation.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82631576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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