Voprosy Khimii i Khimicheskoi Tekhnologii最新文献_第5页

Green synthesis and characterization of reduced graphene oxide 还原性氧化石墨烯的绿色合成与表征

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-07-01 DOI: 10.32434/0321-4095-2023-149-4-69-76

M. H. Nawaz, Nafees Iqbal, Ramla Rehman, J. Lim, M. K. Shahid

{"title":"Green synthesis and characterization of reduced graphene oxide","authors":"M. H. Nawaz, Nafees Iqbal, Ramla Rehman, J. Lim, M. K. Shahid","doi":"10.32434/0321-4095-2023-149-4-69-76","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-149-4-69-76","url":null,"abstract":"The distinctive chemical, physical, thermal and mechanical properties of graphene made it widely recognized material in wide-ranging field of science and technology. Generally, the synthesis of graphene or reduced graphene oxide (rGO) requires two main steps. The first step involves the oxidation of graphite to graphene oxide (GO) and in the second step, reducing agents or reductants contribute to the reduction of GO to form rGO. A large number of reducing agents have been applied to synthesize rGO such as hydrazine, hydroxyl amine, sodium borohydride, etc. However, the hazardous nature of such reducers created a space for the research on green reducing agents for rGO synthesis. This study introduces the low-cost green synthesis of rGO via green reducing agents such as eucalyptus hybrid extract, thiourea, lemon extract and starch. Among all the green reductants, eucalyptus hybrid extract exhibited the remarkable reduction of GO, as confirmed by VU-visible spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction results. The absorption peak of rGO-eucalyptus is appeared at 272 nm, whereas the d-spacing between layers is determined to be 0.364 nm. The obtained band gap of rGO-eucalyptus (2 eV) is found less as compared with other reducing agents such as thiourea, lemon extract and starch. The stretching vibration of oxygen functionalities appeared in FTIR of GO, is disappeared after reduction with eucalyptus extract. The flavonoid components of eucalyptus extracts are antioxidant in nature and hence, work as reducing agents.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80794921","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

Chemical applications of hybridized light-matter states (a review) 光物质杂化态的化学应用(综述)

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-07-01 DOI: 10.32434/0321-4095-2023-149-4-3-16

A. Avramenko

{"title":"Chemical applications of hybridized light-matter states (a review)","authors":"A. Avramenko","doi":"10.32434/0321-4095-2023-149-4-3-16","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-149-4-3-16","url":null,"abstract":"Interactions between light and matter are a fundamental part of chemical sciences responsible for basic photophysical processes such as phosphorescence and fluorescence. However, these photophysical phenomena occur in the \"weak\" limit of interaction between light and matter in which the photon and molecule interact with each other without the former fundamentally changing the physical properties of the latter. By constructing a Fabry-Perot cavity, which traps light of a certain frequency, then placing a molecule in a cavity that undergoes a molecular electron transition at the frequency of the trapped light, scientists can force strong light-matter interaction. This interaction occurs if the exchange between the light of the cavity mode and the molecule's excited state is faster than the decay rate of either state, forming a hybrid light-matter state known as a polariton. The photophysical properties of these polariton states have been of interest to scientists due to the possibility that they can allow for the modification of the reactivity of molecules without the addition of functional groups or modification of the surrounding environment. Of particular interest is the ability of polaritons to influence the potential energy surface of molecules, with polaritons showing the ability to both, suppress the photochemical reaction in molecules such as spiropyran and stilbene, while also enhancing the nonradiative relaxation rate of porphyrins. Due to their photonic nature, polaritons have also shown the ability to facilitate long range energy transfer processes in organic dye molecules. This review focuses on discussing these recent advances in a chemistry context as well as the optical design of cavities required to sustain polaritons.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84556492","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 study of mixed-ligand heterometallic complexes of cobalt and neodymium succinates with pyridine or phenanthroline 钴、琥珀酸钕与吡啶或邻菲罗啉混合配体杂金属配合物的合成与研究

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-07-01 DOI: 10.32434/0321-4095-2023-149-4-94-104

L. Sliusarchuk, N. Ivakha, L. Zheleznova, S. Kuleshov, O. Trunova

{"title":"Synthesis and study of mixed-ligand heterometallic complexes of cobalt and neodymium succinates with pyridine or phenanthroline","authors":"L. Sliusarchuk, N. Ivakha, L. Zheleznova, S. Kuleshov, O. Trunova","doi":"10.32434/0321-4095-2023-149-4-94-104","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-149-4-94-104","url":null,"abstract":"The paper reports the results of the study on the synthesis of new heterometallic complexes of Co(II) and Nd(III) with succinic acid in the presence of 1,10-phenanthroline or pyridine. The following hetero- and monocomplexes were synthesized: [Со(С4Н4О4)2Ру]2H2O and [Со(С4Н4О4)Рhen]2H2O; [Nd2(С4Н4О4)3]5Н2О and [Nd2(С4Н4О4)32Phen]2Н2О; [Сo2Nd2(C4Н4O4)54Py]4Н2О and [Сo2Nd2(C4Н4O4)52Phen]4Н2О (Phen – phenanthroline, and Py – pyridine). The study of their composition, structure, thermal properties and determination of the ability of heterocomplexes to form complex oxides was carried out. The complexes were characterized by a number of physicochemical methods: elemental analysis, IR- and diffuse reflection spectroscopies, X-ray powder diffraction and differential thermal analysis. Based on the analysis of diffuse reflection spectra and IR spectra of heterocomplexes, it was shown that succinic acid and 1,10-phenanthroline are bidentately bound to metal atoms. The metals are connected by succinic acid, forming a chain. Oxide powders were obtained during thermolysis of heterocomplexes up to 8000C. The composition of the synthesized heterometallic compounds was controlled by X-ray powder diffraction. It was shown that a complex oxide of NdСоО3 (cubic crystal system), without impurities, was formed, when the heterocomplex of phenanthroline [Сo2Nd2(C4Н4O4)52Phen]4Н2О was heated to 8000C. When heating the heterocomplex of pyridine [Сo2Nd2(C4Н4O4)54Py]4Н2О, in addition to the complex oxide NdСоО3, oxides Nd2О3 (hexagonal crystal system), Nd2О3 (cubic crystal system) and Со3O4 oxide (cubic crystal system) were formed. The heterocomplex [Сo2Nd2(C4Н4O4)52Phen]4Н2О can be used as a precursor for the synthesis of cobaltate of neodymium with lower energy costs than in solid-phase synthesis.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73340402","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

The relative role of polar and nonpolar factors of the structure of substance on the process of their penetration through the blood–brain barrier 物质结构的极性和非极性因素在其穿透血脑屏障过程中的相对作用

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-07-01 DOI: 10.32434/0321-4095-2023-149-4-51-57

G. P. Kosinska, L. M. Ognichenko, A. Artemenko, M.E. Kichova, T.A. Sidelnykova, O. Lebed', V. Kuz'min

{"title":"The relative role of polar and nonpolar factors of the structure of substance on the process of their penetration through the blood–brain barrier","authors":"G. P. Kosinska, L. M. Ognichenko, A. Artemenko, M.E. Kichova, T.A. Sidelnykova, O. Lebed', V. Kuz'min","doi":"10.32434/0321-4095-2023-149-4-51-57","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-149-4-51-57","url":null,"abstract":"The analysis of the relative role of polar and non-polar factors of the molecular structure on the penetration of substances through the blood–brain barrier (BBB) was carried out. Such analysis will allow a preliminary approximate assessment of the ability of substances to cross the blood–brain barrier. Using previously developed computer expert systems on the basis of QSAR/QSPR models in the framework of simplex approach, the water solubility logSw (polar factor model), the lipophilicity logP (nonpolar factor model), and the characteristics of penetration through the blood–brain barrier (logBB, logPS, logP0PAMPA–BBB) were calculated for a set of 614 different organic compounds. It was determined whether substances belong to classes BBB+ or BBB– and whether these substances are substrates of P-glycoprotein (P-gl) or not (no-P-gl). Analysis of the distribution of the points of the investigated molecules in the logP vs. logSw coordinates revealed that lipophilicity and water solubility for the compounds with high penetrating ability should be approximately in following ranges: 3logP6; and –5logSw–1. For the data, which are presented in different scales, continuous scale and classification scale, a half-sign correlation coefficient Rss was calculated. Rss equals 0.93, that confirms the consistency of the results of the prognosis of Log BB parameters and classification BBB+/BBB–. The general trends in the classification of the investigated compounds according to the BBB+/BBB– and P-gl/no-P-gl classes were quantitatively estimated. The sign coefficient of association, which equals –0.35, emphasizes the antibatic nature of the relationship between the data of the two classifications.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80720399","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

The problem of oxide admixtures in zinc sulfide as a material for infrared optics (a review) 红外光学材料硫化锌中氧化物外加剂的问题(综述)

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-06-01 DOI: 10.32434/0321-4095-2023-148-3-22-28

V. Zinchenko, I. Magunov, O. V. Mozkova, B. A. Gorshteĭn

{"title":"The problem of oxide admixtures in zinc sulfide as a material for infrared optics (a review)","authors":"V. Zinchenko, I. Magunov, O. V. Mozkova, B. A. Gorshteĭn","doi":"10.32434/0321-4095-2023-148-3-22-28","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-148-3-22-28","url":null,"abstract":"The paper reports on the main physicochemical properties of zinc sulfide (ZnS) and the features of its application in optics, optoelectronics, and semiconductor technology, as well as the main synthesis methods (synthesis in a solution, self-propagating high-temperature synthesis, and chemical vapor deposition). The harmful effect of the ZnO admixture on the optical and operational properties of zinc sulfide as a starting material for optical ceramics and in a thin film coating is shown. Possible ways of zinc oxide entering the base material during synthesis, storage in air or subsequent heat treatment are considered. The possibility of detecting and estimating the content of oxide admixture (ZnO) in ZnS by methods of substantial chemical analysis has been established. For the first time, approaches were proposed and implemented aimed at weakening the harmful effect of oxide admixtures by binding them with the help of lanthanide sulfides and sulfofluorides, followed by the formation of lanthanide oxosulfides by exchange reactions. The use of the addition of boron oxide (B2O3) with the formation of complex compounds with significantly lower chemical activity and volatility compared to ZnO is considered more promising. The method developed by the authors implies the complete removal of the ZnO impurity by heat treatment of the material with a sulfurizing agent, Sb2S3, the excess of which is removed by heat treatment in a vacuum. This method seems to be more labor-intensive, but more attractive for consumers of zinc sulfide as a material for interference optics.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81654003","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

The system Hf–Re–Si at 10000C 系统在10000C的Hf-Re-Si

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-06-01 DOI: 10.32434/0321-4095-2023-148-3-72-76

L. Zinko, G. Nychyporuk, R. Gladyshevskii

引用次数: 0

Spectral-luminescent characteristics of coordination compounds and metal polymers of Yb(III) Yb(III)配位化合物和金属聚合物的光谱发光特性

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-06-01 DOI: 10.32434/0321-4095-2023-148-3-77-85

N. Ivakha, O. Berezhnytska, O. Rohovtsov, I. Savchenko, N. Rusakova, O. Trunova

{"title":"Spectral-luminescent characteristics of coordination compounds and metal polymers of Yb(III)","authors":"N. Ivakha, O. Berezhnytska, O. Rohovtsov, I. Savchenko, N. Rusakova, O. Trunova","doi":"10.32434/0321-4095-2023-148-3-77-85","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-148-3-77-85","url":null,"abstract":"New mono- and heteroligand (with phenanthroline or dipyridyl) metal complexes of ytterbium (III) with 2-methyl-5-biphenylpentene-1-3,5-dione were synthesized in this work. Homo- and copolymers of ytterbium complex with methyl methacrylate or styrene were obtained by the method of radical polymerization. Coordination compounds were investigated by IR spectroscopy, diffuse reflectance spectroscopy, thermal and luminescence analyses. It was determined that the -diketone molecules are bidentate-cyclically coordinated to the central atom, and the coordination sphere of the monoligand complex is supplemented by two water molecules, which in the case of heteroligand complexes (HLC) are replaced by phenanthroline or dipyridyl molecules. An increase in thermal stability of heteroligand complexes and metallopolymers was observed compared to the metallocomplex. The spectral properties of the synthesized compounds were studied and it was established that the structure of the coordination node of the elementary link of polymer macromolecules does not change during the polymerization process. It was shown that all the studied samples exhibited 4f-luminescence in the near-infrared region of the spectrum, while the lowest relative luminescence intensity was characteristic of ytterbium (III) homopolymer and copolymers, and the highest values were shown by heteroligand complexes with phenanthroline, which allows us to propose them as precursors of luminescent materials.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78447449","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

Ni–La coatings as electrocatalysts for hydrogen evolution reaction deposited from electrolytes based on a deep eutectic solvent Ni-La涂层作为析氢反应的电催化剂

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-06-01 DOI: 10.32434/0321-4095-2023-148-3-103-109

V. Protsenko, L. Pavlenko, L. Bobrova, S. Korniy, T. Butyrina, F. Danilov

{"title":"Ni–La coatings as electrocatalysts for hydrogen evolution reaction deposited from electrolytes based on a deep eutectic solvent","authors":"V. Protsenko, L. Pavlenko, L. Bobrova, S. Korniy, T. Butyrina, F. Danilov","doi":"10.32434/0321-4095-2023-148-3-103-109","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-148-3-103-109","url":null,"abstract":"Ni–La electrocatalytic coatings were electrodeposited from electrolytes based on a eutectic mixture of choline chloride and ethylene glycol (the so-called deep eutectic solvent \"ethaline\") containing dissolved NiCl2 and LaCl3 salts. It was shown that in this case, nickel alloys containing up to approximately 1.75 wt.% lanthanum were formed. An increase in the cathodic current density and the content of La(III) salt in the solution contributed to a higher content of lanthanum in the electrodeposits. The presence of a lanthanum(III) salt in the electrolyte led to a noticeable leveling of the surface microprofile. The electrocatalytic activity of the deposited coatings towards the hydrogen evolution reaction was evaluated by linear voltammetry in an aqueous solution of 1 M NaOH at a temperature of 298 K. It was found that the polarization of hydrogen evolution decreased, and the exchange current density increased with an increase in the lanthanum content in the coating. For example, the calculated hydrogen evolution exchange current density is 4.2610–5 A cm–2 and 1.0310–3 A cm–2 for a lanthanum-free nickel deposit and a nickel-based coating containing 1.75 wt.% La, respectively. The increased electrocatalytic activity observed when lanthanum was introduced into the nickel matrix can be attributed to both the synergistic interaction of the nickel and lanthanum components of the alloy (as previously described, the catalytic effect resulting from the hypo-hyper-d-electron interaction of transition metals) and the presence of surface active sites with lanthanum in different oxidation states (La(III)/La(II)), which can serve as electron carriers. The significant electrocatalytic effect observed when nickel is doped with lanthanum during deposition from an electrolyte based on DES allows us to consider such electrode materials as very promising for use in the electrolytic synthesis of \"green\" hydrogen.","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91164533","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

Fluorosilicic acid: secondary raw material and reagent in technological practice and preparative synthesis (a review) 氟硅酸:工艺实践和制备中的二次原料和试剂(综述)

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-06-01 DOI: 10.32434/0321-4095-2023-148-3-3-21

V. O. Gelmboldt

引用次数: 0

Template synthesis for the creation of photo- and electrocatalysts 模板合成用于制造光和电催化剂

Voprosy Khimii i Khimicheskoi Tekhnologii Pub Date : 2023-06-01 DOI: 10.32434/0321-4095-2023-148-3-86-93

V. Knysh, O. Shmychkova, T. Luk'yanenko, A. Velichenko

{"title":"Template synthesis for the creation of photo- and electrocatalysts","authors":"V. Knysh, O. Shmychkova, T. Luk'yanenko, A. Velichenko","doi":"10.32434/0321-4095-2023-148-3-86-93","DOIUrl":"https://doi.org/10.32434/0321-4095-2023-148-3-86-93","url":null,"abstract":"This work reports the optimal conditions for the synthesis of a matrix for the creation of photo- and electrocatalysts. Specifically, it is shown that TiO2 nanotube arrays has a high specific surface area and improved catalytic properties, but has low conductivity and weak structural strength, that requires further optimization. The original TiO2 nanotubes were prepared by anodizing of Ti foil in ethylene glycol with 0.3 wt.% ammonium fluoride and 2 vol.% water at a constant potential, followed by another anodizing in ethylene glycol with 5 wt.%H3PO4. The reduction was conducted in 1 M HClO4. Some samples were thermally treated in the air using tube furnace. The study demonstrates how the synthesis conditions of the coating affect the morphology and stoichiometry of the resulting oxide coating. For the obtained materials, the Tafel slope in the oxygen evolution reaction is determined by the semiconductor characteristics of the coating, which, in turn, depend on the stoichiometry of the synthesized oxide. The higher the stoichiometry in the oxygen sublattice, the fewer the charge carriers and the greater the contribution of the semiconductor component to the Tafel slope. As for hydrogen evolution, the layers obtained after heat treatment show a lower Tafel slope (175 mV dec–1).","PeriodicalId":23684,"journal":{"name":"Voprosy Khimii i Khimicheskoi Tekhnologii","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90102331","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