Pub Date : 2020-03-05DOI: 10.33581/2520-257x-2020-1-32-39
T. Sviridova
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.
{"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}
Pub Date : 2019-08-30DOI: 10.33581/2520-257x-2019-2-79-87
M. Zayats, S. Leschev
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.
{"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}
Pub Date : 2019-08-30DOI: 10.33581/2520-257x-2019-2-12-20
Djennet S. Saparova, A. N. Bogatikov, V. Matulis, M. M. Degtyarik
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.
在水或有机溶剂中，氯化铜(II)或溴化铜与1-叔丁基-1,2,4-三唑(L)相互作用，合成了X = Cl或X = Br的结晶配合物CuL2X2和CuL4X2。通过元素分析、x射线分析和红外光谱研究了金属配合物在中波(4000 ~ 500 cm -1)和长波(400 ~ 50 cm -1)区域的结构。对CuL2Cl2和CuL4Cl2配合物的振动光谱进行了量子化学计算，以确定红外光谱中的信号分配。结果表明，CuL2X2配合物的聚合物结构是由于其中一个卤化物离子的桥接而形成的。在CuL4X2配合物中，卤化物离子与1-叔丁基-1,2,4-三唑形成岛状结构。在所有的金属配合物中，1-叔丁基-1,2,4-三唑是由杂环上的N(4)原子配位的。
{"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}
Pub Date : 2019-08-30DOI: 10.33581/2520-257x-2019-2-62-68
L. S. Tsybul’skaya, S. Perevoznikov, V. Shendyukov
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.
以丙二酸盐-甘氨酸盐镀镍液为原料，采用化学沉积法在铝合金基体上制备了镍磷铜功能镀层。采用x射线荧光和x射线物相分析研究了涂层的化学成分和物相组成。采用差示扫描量热法对Ni - P - Cu镀层的热激相变进行了检测。250°和400°С退火导致涂层结构发生变化，在250°С从无定形转变为非晶，在400°С转变为结晶，形成Ni和Ni3P1 - δ相。Ni-P镀层组织的改变使镀层显微硬度提高1.6 ~ 1.7倍，耐磨性提高3 ~ 4倍。400°С退火导致涂层在3.5%氯化钠溶液中的腐蚀稳定性下降。在250℃退火条件下，Ni - P - Cu涂层获得了最佳的物理、机械和防护性能。
{"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}
Pub Date : 2019-08-30DOI: 10.33581/2520-257x-2019-2-40-50
P. Nikishau, E. Ksendzov, D. Shiman, L. V. Gaponik, S. Kostjuk
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.
提出了用各种烷氧苯(苯甲醚和4-苯氧丁醇)对聚异丁烯进行反应性改性的方法，得到功能化聚异丁烯。研究了4-苯氧基丁醇/1,5,7-三氮杂环[4.4.0]十二-5-烯体系中D, l -丙交酯的聚合反应。从而确定了合成聚异丁烯-b- d -l -丙交酯的最佳工艺条件。D, l -丙交酯在聚异丁烯高分子引发剂上聚合得到的共聚物(Mn = 14 300 g/mol和Mn = 36 600 g/mol, Mw / Mn≤2.5)具有微相有序性。嵌段共聚物的形成是通过1Н核磁共振波谱，凝胶渗透色谱和扫描电镜证实的。
{"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}
Pub Date : 2019-08-30DOI: 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
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.
{"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}
Pub Date : 2019-08-30DOI: 10.33581/2520-257x-2019-2-69-78
T. N. Vorobyova, Maryia G. Haluza, Olga N. Vryblevskaya, A. V. Paniatouski, E. A. Veretennikova
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.
{"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}
Pub Date : 2019-08-30DOI: 10.33581/2520-257x-2019-2-21-28
P. Malakhovsky, M. Artemyev
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.
{"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}
Pub Date : 2019-08-30DOI: 10.33581/2520-257x-2019-2-3-11
V. Matulis, Ekaterina G. Ragoyja, T. V. Serebryanskaya, Yuri V. Grigoriev, O. Ivashkevich
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.
{"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}
Pub Date : 2019-08-15DOI: 10.33581/2520-257x-2019-2-51-61
O. Vrublevskaya, M. Shikun
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.
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