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Journal of the Belarusian State University. Chemistry最新文献

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Thermostable heat-insulating composite materials based on hollow microspheres and solid phosphate binders: development and research 基于空心微球和固体磷酸盐粘结剂的耐热隔热复合材料的开发与研究
Journal of the Belarusian State University. Chemistry Pub Date : 2022-09-22 DOI: 10.33581/2520-257x-2022-2-70-82
Natalia Apanasevich, A. Sokal, Alexander N. Kudlash, K. Lapko, Alesia Yu. Siomikha, Aliaksandra M. Yerakhavets
{"title":"Thermostable heat-insulating composite materials based on hollow microspheres and solid phosphate binders: development and research","authors":"Natalia Apanasevich, A. Sokal, Alexander N. Kudlash, K. Lapko, Alesia Yu. Siomikha, Aliaksandra M. Yerakhavets","doi":"10.33581/2520-257x-2022-2-70-82","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-70-82","url":null,"abstract":"Thermostable heat-insulating composite materials based on solid magnesium phosphate and calcium phosphate binders, fly-ash and glass hollow microspheres have been developed and proposed. Thermal and phase transformations have been studied as well as strength characteristics of the initial composites and products of their thermal treatment up to 1000 °C have been determined. It is shown that the prepared phosphate composites are thermally stable in the temperature range of 20 –1000 °С, have a density 0.4 – 0.6 g/cm3 , thermal conductivity 0.11– 0.19 W/(m ⋅ K) and show sufficiently high strength properties (compressive strength 1.4 –3.2 MPa).","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81485103","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
Phase composition and local environment of iron ions in gadolinium-doped iron oxide nanoparticles 掺钆氧化铁纳米颗粒中铁离子的相组成和局部环境
Journal of the Belarusian State University. Chemistry Pub Date : 2022-09-19 DOI: 10.33581/2520-257x-2022-2-30-37
J. Fedotova, Uladzislaw E. Gumiennik, S. Vorobyova, M. M. Degtyarik, A. Kharchanka, J. Przewoźnik, C. Kapusta
{"title":"Phase composition and local environment of iron ions in gadolinium-doped iron oxide nanoparticles","authors":"J. Fedotova, Uladzislaw E. Gumiennik, S. Vorobyova, M. M. Degtyarik, A. Kharchanka, J. Przewoźnik, C. Kapusta","doi":"10.33581/2520-257x-2022-2-30-37","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-30-37","url":null,"abstract":"FeO ⋅ Fe2O3 ⋅ nH2O, Fe2.95Gd0.05O4 and Fe2.9Gd0.1O4 powders were obtained by chemical precipitation from aqueous solutions. The phase composition and local environment of iron ions in gadolinium-doped iron oxide nanoparticles were studied by X-ray diffraction analysis and nuclear gamma resonance (NGR) spectroscopy. Interpretation of radiographs and NGR spectra of synthesised samples indicates the presence of a superposition of maghemite γ-Fe2O3 and iron hydroxide α-FeOOH in the samples. It was found that under the deposition of powders in the presence of gadolinium nitrate, an increase in the content of iron hydroxide α-FeOOH is observed, which disappears after annealing at 200 °C.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73342785","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, structure and characterisation of late transition metal complexes with 2-(tetrazol-1-yl)pyridine 2-(四唑-1-酰基)吡啶晚期过渡金属配合物的合成、结构和表征
Journal of the Belarusian State University. Chemistry Pub Date : 2022-09-13 DOI: 10.33581/2520-257x-2022-2-38-51
T. V. Serebryanskaya, Hanna A. Belavusava, Yuri V. Grigoriev, S. Voitekhovich, L. Ivashkevich, O. Ivashkevich
{"title":"Synthesis, structure and characterisation of late transition metal complexes with 2-(tetrazol-1-yl)pyridine","authors":"T. V. Serebryanskaya, Hanna A. Belavusava, Yuri V. Grigoriev, S. Voitekhovich, L. Ivashkevich, O. Ivashkevich","doi":"10.33581/2520-257x-2022-2-38-51","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-38-51","url":null,"abstract":"Complexes [MII(2-pytz)Cl2] (M(II) = Pt, Pd; 2-pytz = 2-(tetrazol-1-yl)pyridine) were synthesised via direct interaction of the corresponding metal chlorides (K2PtCl4 or PdCl2) with 2-pytz under ambient conditions. RuCl3 does not react with 2-pytz under reflux in the protic media, while under reflux in N, N-dimethylformamide in the presence of LiCl, decomposition of the tetrazole cycle occurred leading to the formation of Ru(III)-coordinated N, N-dimethyl-N ′-(pyridin-2-yl)formimidamide derivative Li[RuIII(Py — N =C — NMe2)2Cl2]. The complex [Ru(2-pytz)(DMSO)3Cl2] ⋅ MeOH, where DMSO is dimethyl sulfoxide, was synthesised by reacting a specially prepared precursor cis-[Ru(DMSO)4Cl2] with 2-pytz in methanol under reflux conditions. The complex [Ru(2-pytz)(DMSO)2Cl2] was synthesised by reacting cis-[Ru(DMSO)4Cl2] with 2-pytz in ethanol under reflux conditions. The resulting complexes were characterised by elemental analyses, electrospray ionisation mass-spectrometry with detection of positive and negative ions, infrared spectroscopy, 1H and 13C nuclear magnetic resonance (NMR) spectroscopy, and simultaneous thermal analysis. The structures of complexes [Pd(2-pytz)Cl2] and [Ru(2-pytz)(DMSO)3Cl2] ⋅ MeOH were investigated by single-crystal X-ray analysis. In the former, 2-pytz shows a N,N-chelating coordination via the pyridine ring N and the tetrazole ring N2 atoms. In the latter, 2-pytz coordinates as a monodentate ligand via the tetrazole ring N4 atom. According to 1H NMR spectroscopy data, in complex [Ru(2-pytz)(DMSO)2Cl2], 2-pytz coordinates as a N, N-chelating ligand via the pyridine ring N and the tetrazole ring N2 atoms.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85844505","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
Green chemistry teaching: Belarusian view through world tendencies 绿色化学教学:世界趋势下的白俄罗斯观
Journal of the Belarusian State University. Chemistry Pub Date : 2022-09-12 DOI: 10.33581/2520-257x-2022-2-83-94
Т.А. Savitskaya, A. P. Liavontsyeu, I. Kimlenka, D. Grinshpan, Pavel Drashar, T. D. Lam, Pham Thi Lan
{"title":"Green chemistry teaching: Belarusian view through world tendencies","authors":"Т.А. Savitskaya, A. P. Liavontsyeu, I. Kimlenka, D. Grinshpan, Pavel Drashar, T. D. Lam, Pham Thi Lan","doi":"10.33581/2520-257x-2022-2-83-94","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-83-94","url":null,"abstract":"The disciplines curricula on green chemistry and sustainable chemistry available in various universities of the world were analysed. Trends in education development and science in this particular area were described as well as actual green chemistry teaching problems that need to be solved. Analysing the data obtained three approaches defining a trajectory for teaching the basic foundations of green chemistry were identified: British, European, and American. The first one involves in-depth study and the formation of competencies in the field of green chemistry. The second approach implies the inclusion of green chemistry in traditional chemical disciplines (organic, analytical chemistry, etc.). The third approach implies the inclusion of green chemistry as a module in such practice-oriented disciplines as biotechnology, food safety, ecology, etc. The content of the laboratory classes in green chemistry curricula and the usage of a green chemistry metric «green star» for assessment of their safety are discussed. It is proposed to join efforts of different countries for green chemistry ideas promotion and transfer the green chemistry ideas through creation of green chemistry centers of excellence for the use of its principles and methods in scientific research and the educational process.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80808165","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 and luminescent properties of strontium aluminates activated with bismuth ions 铋离子活化铝酸锶的合成及其发光性能
Journal of the Belarusian State University. Chemistry Pub Date : 2022-09-05 DOI: 10.33581/2520-257x-2022-2-3-9
G. Shevchenko, Yu. V. Bokshyts, Viktor A. Zhuravkov, G. V. Shishko, Ekaterina A. Kovel
{"title":"Synthesis and luminescent properties of strontium aluminates activated with bismuth ions","authors":"G. Shevchenko, Yu. V. Bokshyts, Viktor A. Zhuravkov, G. V. Shishko, Ekaterina A. Kovel","doi":"10.33581/2520-257x-2022-2-3-9","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-3-9","url":null,"abstract":"The Bi-activated strontium aluminates SrAl2O4 and Sr3Al2O6 are synthesised by the solid-phase method; their structural phase and spectral-luminescent properties are studied. The possibility of controlling the luminescence spectrum, its intensity and, consequently, the colour characteristics of the samples by changing the composition of the matrix, the nature of the activator and its concentration are shown.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75792655","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 deposition of copper on zinc and its alloys 铜在锌及其合金上的电化学沉积
Journal of the Belarusian State University. Chemistry Pub Date : 2022-08-31 DOI: 10.33581/2520-257x-2022-2-64-69
B. Kuznetsov
{"title":"Electrochemical deposition of copper on zinc and its alloys","authors":"B. Kuznetsov","doi":"10.33581/2520-257x-2022-2-64-69","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-64-69","url":null,"abstract":"A new electrolyte composition and deposition conditions of quality (light, densely packed, homogeneous) copper coatings on zinc and its alloys were found. It was established that the electrochemical deposition of copper is possible from an alkaline solution containing propylene glycol. It was shown that the adding of hydroxyethylidene diphosphonic acid in the solution stabilises the electrolyte during operation and storage. The addition of morpholine provided deposition of quality copper coatings on zinc and its alloys in a wide range of current densities.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76539946","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 and structure of novel tripodal ligands based on tetrazol-5-thioles 新型四唑-5-噻唑类三足配体的合成与结构
Journal of the Belarusian State University. Chemistry Pub Date : 2022-08-24 DOI: 10.33581/2520-257x-2022-2-10-18
S. Voitekhovich, M. M. Degtyarik, A. Lyakhov, L. Ivashkevich, Yuri V. Grigoriev, O. Ivashkevich
{"title":"Synthesis and structure of novel tripodal ligands based on tetrazol-5-thioles","authors":"S. Voitekhovich, M. M. Degtyarik, A. Lyakhov, L. Ivashkevich, Yuri V. Grigoriev, O. Ivashkevich","doi":"10.33581/2520-257x-2022-2-10-18","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-10-18","url":null,"abstract":"Novel tripodal ligands (R1N4CS)3CH, where R1 = Me, Ph, were synthesised by alkylation of 1-R-tetrazol-5-thioles with iodoform in alkaline media. These ligands were identified based on data of elemental analysis, nuclear magnetic resonance spectroscopy, thermal analysis, and X-ray diffraction analysis of single crystals.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78621990","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
Thermal protective ability of electrochemically deposited nickel and nickel – boron coatings 电化学镀镍和镍硼涂层的热防护性能
Journal of the Belarusian State University. Chemistry Pub Date : 2022-08-23 DOI: 10.33581/2520-257x-2022-2-52-63
S. Perevoznikov, Ekaterina V. Makovskaya, L. Tsybulskaya, V. Shendyukov
{"title":"Thermal protective ability of electrochemically deposited nickel and nickel – boron coatings","authors":"S. Perevoznikov, Ekaterina V. Makovskaya, L. Tsybulskaya, V. Shendyukov","doi":"10.33581/2520-257x-2022-2-52-63","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-52-63","url":null,"abstract":"The thermal protective ability of electrochemically deposited Ni and Ni – B coatings was investigated with the aim of their potential application in the production of lamella-type under-die coolers. It has been established that all studied nickelbased coatings retain thermal stability when heated in an air atmosphere in the temperature range from 500 to 700 °C. At a higher annealing temperature (800 °C), the coatings are oxidised (to the greatest extent the nickel coating) with the formation of an oxide layer up to 7–8 μm thick, the main product of oxidation is Ni0.8Cu0.2O. It is shown that the Ni – B coating with a boron content of 4.5 at. % exhibits the highest thermal stability due to the formation of a film of nickel borate (Ni3(BO3)2) on its surface during annealing. A thin continuous film of borate prevents the contact of atmospheric oxygen with the surface and, accordingly, the formation of mixed oxides of copper and nickel, which are a consequence of the thermal instability of nickel coatings during annealing.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90739242","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 new multitope tetrazole-containing ligands 新型含四氮唑多构型配体的合成
Journal of the Belarusian State University. Chemistry Pub Date : 2022-08-23 DOI: 10.33581/2520-257x-2022-2-19-29
E. Grigoriev, L. Ivashkevich, A. Lyakhov, Inna Grigorieva, Yuri V. Grigoriev, O. Ivashkevich
{"title":"Synthesis of new multitope tetrazole-containing ligands","authors":"E. Grigoriev, L. Ivashkevich, A. Lyakhov, Inna Grigorieva, Yuri V. Grigoriev, O. Ivashkevich","doi":"10.33581/2520-257x-2022-2-19-29","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-2-19-29","url":null,"abstract":"Drawing the experience of 5-phenyl- and 5-pyridyltetrazoles, it was shown that classical nitration-reduction methods in combination with typical alkylation reactions of tetrazole derivatives can be used to obtain multitopic polynuclear tetrazole-containing ligands. Methods for the preparation of a number of previously undescribed polynuclear tetrazole derivatives, including those combining both tetrazole and pyridine rings in the molecule, have been developed. The composition and structure of the obtained compounds were determined by elemental analysis, single crystal X-ray diffraction, NMR and IR spectroscopy. For (5-(pyridin-2-yl)tetrazol-2-yl)(5-(pyridin-2-yl)tetrazol-1-yl)methane the crystalline structure was determined and it was found that this compound forms a 3D polymer framework due to non-classical hydrogen bonds. In its crystal structure there is a network of π – π stacking interactions between tetrazole rings of neighbouring molecules, as well as between pyridine rings.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76510679","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 and structure of сopper(II) thiocyanate and nitrate complexes with 1-tert-butyl1H-1,2,4-triazolе 1-叔丁基1h -1,2,4-三唑啉酯硫氰酸酯与硝酸酯配合物的合成与结构
Journal of the Belarusian State University. Chemistry Pub Date : 2022-04-11 DOI: 10.33581/2520-257x-2022-1-83-95
M. M. Degtyarik, A. Lyakhov, Inna Grigorieva, L. Ivashkevich, Yuri V. Grigoriev, O. Ivashkevich
{"title":"Synthesis and structure of сopper(II) thiocyanate and nitrate complexes with 1-tert-butyl1H-1,2,4-triazolе","authors":"M. M. Degtyarik, A. Lyakhov, Inna Grigorieva, L. Ivashkevich, Yuri V. Grigoriev, O. Ivashkevich","doi":"10.33581/2520-257x-2022-1-83-95","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-1-83-95","url":null,"abstract":"Complexes [Сu(NCS)2L3], [Сu(NO3)2L4] and [Cu(NCS)2L4]·L have been prepared by direct synthesis involving the interaction of metallic copper, ammonium salts NH4X (Х = NCS, NO3) and 1-tert-butyl-1H-1,2,4-triazole (L). Their composition and structure were determined by elemental analysis, single crystal X-ray analysis, and IR spectroscopy (range of 4000–500 cm–1). All the complexes showed mononuclear structure. In them triazole acts as a monodentate ligand, being coordinated by the N4 atom of the heterocycle. The NCS– and NO–3 anions display monodentate N- and O-coordination, accordingly. In [Сu(NCS)2L3], copper(II) cation has square-pyramidal environment of nitrogen atoms of two ligands L and two thiocyanate anions in the basal sites, and one nitrogen atom of ligand L in the apical position. In complexes [Сu(NO3)2L4] and [Cu(NCS)2L4]·L, copper(II) cations are octahedrally surrounded by nitrogen atoms of ligand L in the equatorial sites and by O or N atoms of corresponding anions in the axial positions.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78964919","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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