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Amorphization of poly(vinyl alcohol) in the mesoporous matrix based on high-density polyethylene 聚乙烯醇在基于高密度聚乙烯的介孔基质中的蜕变
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.044
Alena Yu. Yarysheva , Aleksandr Yu. Kopnov , Anna K. Berkovich , Artem V. Bakirov , Larisa M. Yarysheva , Olga V. Arzhakova , Sergey N. Chvalun
{"title":"Amorphization of poly(vinyl alcohol) in the mesoporous matrix based on high-density polyethylene","authors":"Alena Yu. Yarysheva ,&nbsp;Aleksandr Yu. Kopnov ,&nbsp;Anna K. Berkovich ,&nbsp;Artem V. Bakirov ,&nbsp;Larisa M. Yarysheva ,&nbsp;Olga V. Arzhakova ,&nbsp;Sergey N. Chvalun","doi":"10.1016/j.mencom.2024.06.044","DOIUrl":"10.1016/j.mencom.2024.06.044","url":null,"abstract":"<div><p>Poly(vinyl alcohol) (PVA) was incorporated into the mesoporous structure of high-density polyethylene (HDPE) directly upon the tensile drawing of films <em>via</em> crazing in water–ethanol PVA solutions. The structure and thermophysical properties of the HDPE–PVA nanocomposites were explored by differential scanning calorimetry and X-ray analysis. PVA was found to exist in an amorphized state within the mesoporous structure of the HDPE host matrix since its crystallization is prevented by the spatial confinements.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 604-605"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tribological characteristics of electroless Ni–P alloys as an alternative to chromium coatings: infometric analysis 作为铬涂层替代品的无电解 Ni-P 合金的摩擦学特性：信息计量分析
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.002
Evgeny G. Vinokurov , Tatiana F. Burukhina , Vladimir D. Skopintsev , Valeriy P. Meshalkin
{"title":"Tribological characteristics of electroless Ni–P alloys as an alternative to chromium coatings: infometric analysis","authors":"Evgeny G. Vinokurov ,&nbsp;Tatiana F. Burukhina ,&nbsp;Vladimir D. Skopintsev ,&nbsp;Valeriy P. Meshalkin","doi":"10.1016/j.mencom.2024.06.002","DOIUrl":"10.1016/j.mencom.2024.06.002","url":null,"abstract":"<div><p>Ni–P coatings, with their high microhardness (HV) and wear resistance, have been proposed as a viable alternative to hard chromium. However, wear testing experiments on electroless Ni–P coatings were conducted under a variety of conditions, including test equipment, load, substrate materials and counterface materials, resulting in unreliable comparative evaluations of experimental results. Therefore, this article presents an analysis of experimental research on Ni–P and Cr coatings, as well as a statistical analysis of the results obtained under similar conditions. The results of simultaneous wear tests on Ni–P and Cr coatings published from 1958 to 2022 were used for evaluation and comparative analysis. The relative wear of Ni–P <em>versus</em> hard Cr was calculated from experimental data and analyzed using statistical methods such as Tukey’s statistical methods, nonparametric and parametric statistics. This review found that the wear performance of electroless nickel coatings generally does not match that of hard chromium coatings. The results of this analysis indicate that: (i) Ni–P coating can be used as a protective and hardening coating; (ii) the wear resistance of the electroless Ni–P coating, being 1.9 ± 0.4 times less, does not reach the same level of wear resistance as that of hard Cr; (iii) there is a tendency for the wear resistance of Ni–P to gradually approach the wear resistance of Cr; (iv) the dependence of the wear rate on the phosphorus content of the Ni–P alloy indicates that the minimum possible wear rate is achieved at a P content of about 4–7 wt%. The search for effective alternatives to hard chromium plating is ongoing, and this review has identified several areas where effective engineering solutions could be found.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 472-477"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The synergistic effect of ultrasound and γ-radiation on Lactobacillus casei bacteria in the presence of a theraphthal sonosensitizer 超声波和 γ 射线在 theraphthal 声敏化剂作用下对干酪乳杆菌的协同效应
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.015
Alexey V. Sarantsev , Svetlana E. Mazina , Alexander V. Gopin , Oxana V. Kharissova , Boris I. Kharisov , Alexander L. Nikolaev
{"title":"The synergistic effect of ultrasound and γ-radiation on Lactobacillus casei bacteria in the presence of a theraphthal sonosensitizer","authors":"Alexey V. Sarantsev ,&nbsp;Svetlana E. Mazina ,&nbsp;Alexander V. Gopin ,&nbsp;Oxana V. Kharissova ,&nbsp;Boris I. Kharisov ,&nbsp;Alexander L. Nikolaev","doi":"10.1016/j.mencom.2024.06.015","DOIUrl":"10.1016/j.mencom.2024.06.015","url":null,"abstract":"<div><p>The effectiveness of the combined action of ultrasound and γ-radiation on <em>Lactobacillus casei</em> is studied. A superadditive death effect is shown, whose magnitude depends on dose levels, sequence of effects, and the presence of theraphthal (sodium salt of cobalt 4,5-octacarboxyphthalocyanine) as a sonosensitizer.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 518-520"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","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 functional allyl-α-tetrahydropyrones from cyrene 从芘合成功能性烯丙基-α-四氢吡喃酮
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.016
Yuliya A. Khalilova, Liliya Kh. Faizullina, Shamil M. Salikhov, Farid A. Valeev
{"title":"Synthesis of functional allyl-α-tetrahydropyrones from cyrene","authors":"Yuliya A. Khalilova,&nbsp;Liliya Kh. Faizullina,&nbsp;Shamil M. Salikhov,&nbsp;Farid A. Valeev","doi":"10.1016/j.mencom.2024.06.016","DOIUrl":"10.1016/j.mencom.2024.06.016","url":null,"abstract":"<div><p>Addition of allylzinc to cyrene affords diastereomeric 4-allyl-6,8-dioxabicyclo[3.2.1]octan-4-ols. Opening of their 1,6-anhydro bridge with Ac<sub>2</sub>O followed by selective deacetylation of the resulting tertiary and acetal acetates yields diastereomeric 2-acetoxymethyl-5-allyl-tetrahydro- pyran-5,6-diols whose oxidation by the action of DMSO–Ac<sub>2</sub>O system is accompanied by etherification of tertiary hydroxy groups leading to methylthiomethoxy pyrone derivatives. The opening of 1,6-anhydro bridge in 4-allyl-6,8-dioxabicyclo[3.2.1]octan-4-ols with MeOH–HCl followed by oxidation with PCC gives individual (4<em>S</em>,6<em>S</em>)- 1-allyl-6-methoxy-2,5-dioxabicyclo[2.2.2]octan-3-one.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 521-522"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nanosized systems of aluminum phthalocyanine and amphiphilic copolymers of N-vinylpyrrolidone with mono- and dimethacrylates for photodynamic therapy and fluorescence diagnostics 用于光动力疗法和荧光诊断的纳米级酞菁铝系统以及 N-乙烯基吡咯烷酮与单甲基和二甲基丙烯酸酯的两性共聚物
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.007
Svetlana V. Kurmaz, Ivan V. Ulyanov, Nina S. Emelyanova, Vladimir A. Kurmaz, Alexey V. Kozlov, Lev R. Sizov, Alexander Yu. Rybkin
{"title":"Nanosized systems of aluminum phthalocyanine and amphiphilic copolymers of N-vinylpyrrolidone with mono- and dimethacrylates for photodynamic therapy and fluorescence diagnostics","authors":"Svetlana V. Kurmaz,&nbsp;Ivan V. Ulyanov,&nbsp;Nina S. Emelyanova,&nbsp;Vladimir A. Kurmaz,&nbsp;Alexey V. Kozlov,&nbsp;Lev R. Sizov,&nbsp;Alexander Yu. Rybkin","doi":"10.1016/j.mencom.2024.06.007","DOIUrl":"10.1016/j.mencom.2024.06.007","url":null,"abstract":"<div><p>Water-soluble nanosized systems of aluminum phthalo- cyanine, which is a promising photosensitizer for photodynamic therapy and fluorescence diagnostics, were obtained by encapsulating it in biocompatible copolymers of <em>N</em>-vinylpyrrolidone with mono- and dimethacrylates. The physicochemical (water solubility, stability and size of nanoparticles) and photophysical (absorption and fluorescence) properties of the resulting nanoparticles in aqueous solution were determined. Quantum chemical modeling revealed the formation of coordination bonds between the Al atom of the dye and the oxygen atoms of all monomer units.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 492-495"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis, reactivity, and catalytic application of tetraphenylcyclobutadiene iridium complexes 四苯基环丁二烯铱络合物的合成、反应性和催化应用
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.025
Nikita V. Shvydkiy, Yulia V. Nelyubina, Dmitry S. Perekalin
{"title":"Synthesis, reactivity, and catalytic application of tetraphenylcyclobutadiene iridium complexes","authors":"Nikita V. Shvydkiy,&nbsp;Yulia V. Nelyubina,&nbsp;Dmitry S. Perekalin","doi":"10.1016/j.mencom.2024.06.025","DOIUrl":"10.1016/j.mencom.2024.06.025","url":null,"abstract":"<div><p>Reaction of [(coe)<sub>2</sub>IrCl]<sub>2</sub> (coe = cyclooctene) with AgPF<sub>6</sub>, arene (toluene, <em>p</em>-xylene, mesitylene), and diphenylacetylene, followed by counter anion exchange to BARF<sup>–</sup>, gives cyclobutadiene iridium complexes [(C<sub>4</sub>Ph<sub>4</sub>)Ir(arene)]BARF in 10–22% yield. Replacement of toluene in [(C<sub>4</sub>Ph<sub>4</sub>)Ir(toluene)]BARF by various ligands (trimethyl-phosphite, 1,3,5-triaza-7-phosphaadamantane, <em>tert</em>-butyl isonitrile) provides access to the half-sandwich cyclobuta-diene iridium complexes [(C<sub>4</sub>Ph<sub>4</sub>)Ir(L)<sub>3</sub>]BARF. Complex [(C<sub>4</sub>Ph<sub>4</sub>)Ir(toluene)]BARF in combination with [NBnEt<sub>3</sub>]Cl catalyses the insertion reaction between phenyl diazoacetate and various amines.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 547-549"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","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 functionalized thiazolidin-4-ones by the condensation of thioureas with dialkyl acetylenedicarboxylates 通过硫脲类化合物与乙炔二羧酸二烷基酯的缩合合成新的官能化噻唑烷-4-酮
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.031
Andrey A. Streltsov, Alexei N. Izmest’ev, Yurii A. Strelenko, Angelina N. Kravchenko, Galina A. Gazieva
{"title":"Synthesis of new functionalized thiazolidin-4-ones by the condensation of thioureas with dialkyl acetylenedicarboxylates","authors":"Andrey A. Streltsov,&nbsp;Alexei N. Izmest’ev,&nbsp;Yurii A. Strelenko,&nbsp;Angelina N. Kravchenko,&nbsp;Galina A. Gazieva","doi":"10.1016/j.mencom.2024.06.031","DOIUrl":"10.1016/j.mencom.2024.06.031","url":null,"abstract":"<div><p>Thiazolidin-4-ones functionalized at the position 5 and their heterocycle-annulated analogues were obtained based on the reaction of thioureas with dialkyl acetylenedicarboxylates. In most cases the reaction proceeds with high selectivity to form 2-iminothiazolidin-4-one-type products.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 563-565"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reactions of 1-alkylsulfanyl- and 1-alkylsulfonyl- 2,3,5,6-tetrafluorobenzenes with nitromethane and DBU 1- 烷基硫酰基和 1- 烷基磺酰基-2,3,5,6-四氟苯与硝基甲烷和 DBU 的反应
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.021
Borislav V. Koshcheev, Alexander M. Maksimov, Rodion V. Andreev
{"title":"Reactions of 1-alkylsulfanyl- and 1-alkylsulfonyl- 2,3,5,6-tetrafluorobenzenes with nitromethane and DBU","authors":"Borislav V. Koshcheev,&nbsp;Alexander M. Maksimov,&nbsp;Rodion V. Andreev","doi":"10.1016/j.mencom.2024.06.021","DOIUrl":"10.1016/j.mencom.2024.06.021","url":null,"abstract":"<div><p>1-Alkylsulfanyl-4-X-2,3,5,6-tetrafluorobenzenes (X = CF<sub>3</sub>, H; alkyl = Me, Bn, CHF<sub>2</sub>) upon reactions with nitromethane in the presence of DBU undergo replacement of 2 or 3-positioned fluorine atoms by a nitromethyl group to afford the corresponding (nitromethyl)trifluoroarenes. The calculations of the transition states using the DFT method correctly predict the ratios of reaction products. In the cases of relative sulfones, only 2-positioned fluorine atom undergoes substitution; however, the sulfonyl group can also be displaced by a nitromethyl moiety.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 533-535"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141952366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unsymmetrical cationic porphyrin that forms sedimentation-unstable complexes with nucleic acids 与核酸形成沉降不稳定复合物的不对称阳离子卟啉
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.018
Natalya Sh. Lebedeva , Elena S. Yurina , Aleksey N. Kiselev , Mikhail A. Lebedev , Sergey A. Syrbu
{"title":"Unsymmetrical cationic porphyrin that forms sedimentation-unstable complexes with nucleic acids","authors":"Natalya Sh. Lebedeva ,&nbsp;Elena S. Yurina ,&nbsp;Aleksey N. Kiselev ,&nbsp;Mikhail A. Lebedev ,&nbsp;Sergey A. Syrbu","doi":"10.1016/j.mencom.2024.06.018","DOIUrl":"10.1016/j.mencom.2024.06.018","url":null,"abstract":"<div><p>A water-soluble cationic porphyrin containing <em>N</em>-methyl- pyridinium fragments and an indole residue, namely, 5-[4-(1-methylindol-2-yl)phenyl]-10,15,20-tris(1-methyl- pyridinium-3-yl)porphyrin triiodide, has been synthesized. The porphyrin forms sedimentation unstable complexes with low and high molecular weight nucleic acids. This ability to precipitate nucleic acids can be used in laboratory, clinical and research practice for isolating nucleic acids.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 525-527"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141960058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","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 3-(2,3,5,6-tetrafluoropyridinylthio)pyrazoles from 3-aminopyrazoles 从 3-氨基吡唑合成 3-(2,3,5,6-四氟吡啶硫基)吡唑
IF 1.8 4区 化学
Mendeleev Communications Pub Date : 2024-07-01 DOI: 10.1016/j.mencom.2024.06.020
Denis S. Koltun, Alexander D. Dilman
{"title":"Synthesis of 3-(2,3,5,6-tetrafluoropyridinylthio)pyrazoles from 3-aminopyrazoles","authors":"Denis S. Koltun,&nbsp;Alexander D. Dilman","doi":"10.1016/j.mencom.2024.06.020","DOIUrl":"10.1016/j.mencom.2024.06.020","url":null,"abstract":"<div><p>Pyrazoles bearing (2,3,5,6-tetrafluoropyridinyl)thio group were obtained from 3-aminopyrazoles. The reaction is performed by diazotization of starting amines followed by treatment of the intermediate diazonium salts with 2,3,5,6-tetrafluoropyridine-4-thiol and potassium carbonate. The method is best applied towards 4-substituted 3-aminopyrazoles.</p></div>","PeriodicalId":18542,"journal":{"name":"Mendeleev Communications","volume":"34 4","pages":"Pages 531-532"},"PeriodicalIF":1.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141962815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","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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