In the last five years the field of catalytic oligomerization and polymerization of olefins using complexes of late transition metals has been the most intensively developing area of post-metallocene catalysis. This review is devoted to detailed analysis of the influence of metal nature on the catalytic properties of systems based on complexes of iron triad metals. Some novel and developing areas of application of such complexes in olefin oligomerization and polymerization (ethylene trimerization, production of olefins with an odd number of carbon atoms and polyethylene waxes, targeted synthesis of heavy fractions of ethylene oligomers) are surveyed. Different approaches to the heterogenization of catalysts on various solid supports are considered. The bibliography includes 225 references.
{"title":"Catalytic oligomerization and polymerization of ethylene with complexes of iron triad metals: influence of metal nature and new prospects","authors":"S. Zubkevich, V. Tuskaev, S. Gagieva, B. Bulychev","doi":"10.1070/RCR5021","DOIUrl":"https://doi.org/10.1070/RCR5021","url":null,"abstract":"In the last five years the field of catalytic oligomerization and polymerization of olefins using complexes of late transition metals has been the most intensively developing area of post-metallocene catalysis. This review is devoted to detailed analysis of the influence of metal nature on the catalytic properties of systems based on complexes of iron triad metals. Some novel and developing areas of application of such complexes in olefin oligomerization and polymerization (ethylene trimerization, production of olefins with an odd number of carbon atoms and polyethylene waxes, targeted synthesis of heavy fractions of ethylene oligomers) are surveyed. Different approaches to the heterogenization of catalysts on various solid supports are considered. The bibliography includes 225 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"91 1","pages":""},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59010795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This review aims to highlight significant progress in the calculation of 77Se NMR chemical shifts and spin – spin coupling constants involving selenium substantiated with a vast amount of experimental data. The material is arranged in two basic sections: the first one dealing with the calculation of 77Se NMR chemical shifts and the second one dealing with the computation of spin – spin coupling constants involving 77Se nucleus, namely 77Se–1H, 77Se–13C and 77Se–77Se together with some more exotic types of couplings, 77Se – 15N, 77Se–19F, 77Se–29Si and 77Se–31P. A special attention is focused on the stereoelectronic effects involving selenium atom and their manifestation in the 77Se NMR spectra of organoselenium compounds studied with the aid of the modern calculation of 77Se NMR parametres in combination with experimental results. The bibliography includes 114 references.
{"title":"Recent advances in computational liquid-phase 77Se NMR","authors":"L. Krivdin","doi":"10.1070/RCR4960","DOIUrl":"https://doi.org/10.1070/RCR4960","url":null,"abstract":"This review aims to highlight significant progress in the calculation of 77Se NMR chemical shifts and spin – spin coupling constants involving selenium substantiated with a vast amount of experimental data. The material is arranged in two basic sections: the first one dealing with the calculation of 77Se NMR chemical shifts and the second one dealing with the computation of spin – spin coupling constants involving 77Se nucleus, namely 77Se–1H, 77Se–13C and 77Se–77Se together with some more exotic types of couplings, 77Se – 15N, 77Se–19F, 77Se–29Si and 77Se–31P. A special attention is focused on the stereoelectronic effects involving selenium atom and their manifestation in the 77Se NMR spectra of organoselenium compounds studied with the aid of the modern calculation of 77Se NMR parametres in combination with experimental results. The bibliography includes 114 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"90 1","pages":"265 - 279"},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59008510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present review addresses the computation of the NMR parameters of 109Ag, 113Cd, 119Sn, 125Te, 195Pt, 199Hg, 205Tl, and 207Pb isotopes. The presented material is based on papers that appeared mainly in the interim period of 2000–2020. These calculations are rapidly developing and becoming of increasing practical interest on the cutting edge of modern computational chemistry. The review focuses on the most essential papers in this area, concentrating on the computational aspects of such calculations together with their structural and stereochemical applications in organometallic chemistry, which seems to be urgent and timely. The bibliography includes 173 references.
{"title":"Computational NMR of heavy nuclei involving 109Ag, 113Cd, 119Sn, 125Te, 195Pt, 199Hg, 205Tl, and 207Pb","authors":"L. Krivdin","doi":"10.1070/RCR4976","DOIUrl":"https://doi.org/10.1070/RCR4976","url":null,"abstract":"The present review addresses the computation of the NMR parameters of 109Ag, 113Cd, 119Sn, 125Te, 195Pt, 199Hg, 205Tl, and 207Pb isotopes. The presented material is based on papers that appeared mainly in the interim period of 2000–2020. These calculations are rapidly developing and becoming of increasing practical interest on the cutting edge of modern computational chemistry. The review focuses on the most essential papers in this area, concentrating on the computational aspects of such calculations together with their structural and stereochemical applications in organometallic chemistry, which seems to be urgent and timely. The bibliography includes 173 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"90 1","pages":"1166 - 1212"},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59009011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The review addresses and highlights the main results of research on the physicohemical properties of single-phase and composite materials based on transition metal oxides in relation to their practical application as electrode materials for symmetrical solid oxide fuel cells. The electronic structures and thermodynamic stability of transition metal oxides with the perovskite structure are discussed. A detailed consideration is given to the thermal behaviour, chemical stability, electrical conductivity and electrochemical properties of a broad range of electrode materials based on iron-, chromium- and manganese-containing perovskite-like oxides and oxides that crystallize in other structure types. The analysis revealed the most promising compositions of electrode materials for symmetrical solid oxide fuel cells and effective approaches to the improvement of their functional characteristics. The bibliography includes 202 references.
{"title":"Electrode materials based on complex d-metal oxides for symmetrical solid oxide fuel cells","authors":"S. Istomin, N. Lyskov, G. Mazo, E. Antipov","doi":"10.1070/RCR4979","DOIUrl":"https://doi.org/10.1070/RCR4979","url":null,"abstract":"The review addresses and highlights the main results of research on the physicohemical properties of single-phase and composite materials based on transition metal oxides in relation to their practical application as electrode materials for symmetrical solid oxide fuel cells. The electronic structures and thermodynamic stability of transition metal oxides with the perovskite structure are discussed. A detailed consideration is given to the thermal behaviour, chemical stability, electrical conductivity and electrochemical properties of a broad range of electrode materials based on iron-, chromium- and manganese-containing perovskite-like oxides and oxides that crystallize in other structure types. The analysis revealed the most promising compositions of electrode materials for symmetrical solid oxide fuel cells and effective approaches to the improvement of their functional characteristics. The bibliography includes 202 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"90 1","pages":"644 - 676"},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59008829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recent progress in observational astronomy and astrophysics has stimulated intensive laboratory studies aimed at elucidating the mechanisms of evolution of molecular matter in interstellar space and various space objects. One of the most intriguing and rapidly developing areas of these studies is the so-called “cold astrochemistry” devoted to the complex processes occurring in astrophysical ices. In this context, the matrix isolation technique (known for decades) is a very useful approach for both interpreting the results of astrophysical observations and verifying possible mechanisms of key astrochemical processes. This review outlines the most important results of recent studies using the matrix isolation technique. In fact, the results of these studies contribute to “cold” astrochemistry in two main aspects: (i) spectroscopy of astrochemically important molecules, ions and radicals stabilized in cryogenic matrices; (ii) experimental modeling of mechanisms of radiation-induced and “in dark” chemical reactions occurring in “cold” space environments (interstellar, cometary and planetary ices). In the first aspect, special attention is paid to new spectroscopic data obtained using various methods (electronic and vibrational absorption spectroscopy, electron paramagnetic resonance spectroscopy). In the second aspect, we consider the chemical effects resulting from both direct excitation of isolated molecules and the transfer of energy initially absorbed by the medium. Special attention has been paid to recent studies of spectroscopic characteristics and radiation-induced evolution of matrix-isolated weak intermolecular complexes, which can be considered “building blocks” for cold synthesis of complex molecules in the absence of diffusion mobility. In addition, we consider the use of matrix isolation for the studies of low-temperature chemical reactions “in dark” involving atoms and highly reactive intermediates, which can occur in cold space environments. In the final part, we briefly discuss the applicability of the results of matrix isolation experiments for interpretation of the mechanisms in molecular ices and highlight the prospects of this field. The review can also be useful for specialists in various aspects of chemistry and chemical physics (radiation chemistry, photochemistry, molecular spectroscopy, low-temperature chemistry). The bibliography includes 379 references.
{"title":"Matrix isolation in laboratory astrochemistry: state-of-the-art, implications and perspective","authors":"V. Feldman, S. Ryazantsev, S. Kameneva","doi":"10.1070/RCR4995","DOIUrl":"https://doi.org/10.1070/RCR4995","url":null,"abstract":"Recent progress in observational astronomy and astrophysics has stimulated intensive laboratory studies aimed at elucidating the mechanisms of evolution of molecular matter in interstellar space and various space objects. One of the most intriguing and rapidly developing areas of these studies is the so-called “cold astrochemistry” devoted to the complex processes occurring in astrophysical ices. In this context, the matrix isolation technique (known for decades) is a very useful approach for both interpreting the results of astrophysical observations and verifying possible mechanisms of key astrochemical processes. This review outlines the most important results of recent studies using the matrix isolation technique. In fact, the results of these studies contribute to “cold” astrochemistry in two main aspects: (i) spectroscopy of astrochemically important molecules, ions and radicals stabilized in cryogenic matrices; (ii) experimental modeling of mechanisms of radiation-induced and “in dark” chemical reactions occurring in “cold” space environments (interstellar, cometary and planetary ices). In the first aspect, special attention is paid to new spectroscopic data obtained using various methods (electronic and vibrational absorption spectroscopy, electron paramagnetic resonance spectroscopy). In the second aspect, we consider the chemical effects resulting from both direct excitation of isolated molecules and the transfer of energy initially absorbed by the medium. Special attention has been paid to recent studies of spectroscopic characteristics and radiation-induced evolution of matrix-isolated weak intermolecular complexes, which can be considered “building blocks” for cold synthesis of complex molecules in the absence of diffusion mobility. In addition, we consider the use of matrix isolation for the studies of low-temperature chemical reactions “in dark” involving atoms and highly reactive intermediates, which can occur in cold space environments. In the final part, we briefly discuss the applicability of the results of matrix isolation experiments for interpretation of the mechanisms in molecular ices and highlight the prospects of this field. The review can also be useful for specialists in various aspects of chemistry and chemical physics (radiation chemistry, photochemistry, molecular spectroscopy, low-temperature chemistry). The bibliography includes 379 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"90 1","pages":"1142 - 1165"},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59009555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The results of studies on the development of micro-oscillators (MOs) based on the Belousov –Zhabotinsky (BZ) oscillatory chemical reaction are integrated and systematized. The mechanisms of the BZ reaction and the methods of immobilization of the catalyst of the BZ reaction in micro-volumes are briefly discussed. Methods for creating BZ MOs based on water microdroplets in the oil phase and organic and inorganic polymer microspheres are considered. Methods of control and management of the dynamics of BZ MO networks are described, including methods of MO synchronization. The prospects for the design of neural networks of MOs with intelligent-like behaviour are outlined. Such networks present a new area of nonlinear chemistry, including, in particular, the creation of a chemical ‘computer’. The bibliography includes 250 references.
{"title":"Chemical micro-oscillators based on the Belousov–Zhabotinsky reaction","authors":"Ilya L. Mallphanov, V. Vanag","doi":"10.1070/RCR5009","DOIUrl":"https://doi.org/10.1070/RCR5009","url":null,"abstract":"The results of studies on the development of micro-oscillators (MOs) based on the Belousov –Zhabotinsky (BZ) oscillatory chemical reaction are integrated and systematized. The mechanisms of the BZ reaction and the methods of immobilization of the catalyst of the BZ reaction in micro-volumes are briefly discussed. Methods for creating BZ MOs based on water microdroplets in the oil phase and organic and inorganic polymer microspheres are considered. Methods of control and management of the dynamics of BZ MO networks are described, including methods of MO synchronization. The prospects for the design of neural networks of MOs with intelligent-like behaviour are outlined. Such networks present a new area of nonlinear chemistry, including, in particular, the creation of a chemical ‘computer’. The bibliography includes 250 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"90 1","pages":"1263 - 1286"},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59010524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Modern approaches to increasing the efficiency of solid-oxide fuel cells (SOFCs) based on electrolytic membranes with mixed conductivity are considered. These approaches are based on material-science concepts (expansion of the electrolytic domain boundary due to the doping of basic oxides and development of various composite materials) and various technological solutions (application of electron-blocking layers on the anode and cathode sides, rational selection of the electrolyte thickness, and optimization of the electrolyte and electrode structures by synthesizing heterostructures). The methods of mathematical modelling of devices with an electrolytic membrane having mixed conductivity are analyzed in order to determine the most efficient design and optimal operation conditions for SOFCs. The application of nanocomposite electrolytes with a core – shell structure and salt composites is considered. Data on new design solutions — single-layer and single-chamber SOFCs — are presented. The prospects of the proposed approaches are evaluated. The bibliography includes 384 references.
{"title":"Solid oxide fuel cells based on ceramic membranes with mixed conductivity: improving efficiency","authors":"E. Pikalova, E. Kalinina","doi":"10.1070/RCR4966","DOIUrl":"https://doi.org/10.1070/RCR4966","url":null,"abstract":"Modern approaches to increasing the efficiency of solid-oxide fuel cells (SOFCs) based on electrolytic membranes with mixed conductivity are considered. These approaches are based on material-science concepts (expansion of the electrolytic domain boundary due to the doping of basic oxides and development of various composite materials) and various technological solutions (application of electron-blocking layers on the anode and cathode sides, rational selection of the electrolyte thickness, and optimization of the electrolyte and electrode structures by synthesizing heterostructures). The methods of mathematical modelling of devices with an electrolytic membrane having mixed conductivity are analyzed in order to determine the most efficient design and optimal operation conditions for SOFCs. The application of nanocomposite electrolytes with a core – shell structure and salt composites is considered. Data on new design solutions — single-layer and single-chamber SOFCs — are presented. The prospects of the proposed approaches are evaluated. The bibliography includes 384 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"60 25 1","pages":"703 - 749"},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59008281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Tretyakov, V. Ovcharenko, A. Terent’ev, I. Krylov, T. Magdesieva, D. Mazhukin, N. Gritsan
In recent years, research dealing with organic paramagnetic compounds such as stable radicals and high-spin systems has been focused on applied aspects. Several key trends have formed in the application and, hence, in the function-oriented synthesis of organic radicals and polyradicals. This review addresses one of such trends in which the dominant role is played by so-called conjugated nitroxides. Their specific feature is the presence of any unsaturated moiety (C=C, C=N or C=O multiple bond; aromatic or heteroaromatic ring; fused polyaromatic system) adjacent to the nitroxide group. The achievements of the chemistry of conjugated nitroxides are presented, and their physicochemical properties, magneto-structural correlations and practical applications are discussed. The bibliography includes 641 references.
{"title":"Conjugated nitroxides","authors":"E. Tretyakov, V. Ovcharenko, A. Terent’ev, I. Krylov, T. Magdesieva, D. Mazhukin, N. Gritsan","doi":"10.1070/rcr5025","DOIUrl":"https://doi.org/10.1070/rcr5025","url":null,"abstract":"In recent years, research dealing with organic paramagnetic compounds such as stable radicals and high-spin systems has been focused on applied aspects. Several key trends have formed in the application and, hence, in the function-oriented synthesis of organic radicals and polyradicals. This review addresses one of such trends in which the dominant role is played by so-called conjugated nitroxides. Their specific feature is the presence of any unsaturated moiety (C=C, C=N or C=O multiple bond; aromatic or heteroaromatic ring; fused polyaromatic system) adjacent to the nitroxide group. The achievements of the chemistry of conjugated nitroxides are presented, and their physicochemical properties, magneto-structural correlations and practical applications are discussed. The bibliography includes 641 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"91 1","pages":""},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59010968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Rempel, A. Valeeva, A. Vokhmintsev, I. Weinstein
Methods of synthesis of nanotubular structures based on titania of various phase and chemical compositions are described. A systematic account is given of known data about the influence of synthesis and subsequent treatment conditions on the amorphous and crystal structures, specific surface area, morphology and optical, luminescence and electro-physical properties of titania-based nanotubular oxide materials. The photocatalytic properties in the oxidation reactions of organic compounds and the performance characteristics of the memristive behaviour of TiO2-based nanotubular structures are considered in details. Their applications are discussed. The bibliography includes 238 references.
{"title":"Titanium dioxide nanotubes: synthesis, structure, properties and applications","authors":"A. Rempel, A. Valeeva, A. Vokhmintsev, I. Weinstein","doi":"10.1070/RCR4991","DOIUrl":"https://doi.org/10.1070/RCR4991","url":null,"abstract":"Methods of synthesis of nanotubular structures based on titania of various phase and chemical compositions are described. A systematic account is given of known data about the influence of synthesis and subsequent treatment conditions on the amorphous and crystal structures, specific surface area, morphology and optical, luminescence and electro-physical properties of titania-based nanotubular oxide materials. The photocatalytic properties in the oxidation reactions of organic compounds and the performance characteristics of the memristive behaviour of TiO2-based nanotubular structures are considered in details. Their applications are discussed. The bibliography includes 238 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"90 1","pages":"1397 - 1414"},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59009418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Experimental and theoretical studies on aromatic nitrenes bearing from three to six unpaired electrons and having quartet, quintet, sextet or septet ground spin states, published in the last 15 years are analyzed. A comparative analysis of the magnetic properties of high-spin nitrenes and all other known high-spin organic molecules is performed. Promising areas of practical application of high-spin nitrenes as molecular magnets and as qubits and qudits for quantum computations are discussed. The bibliography includes 214 references.
{"title":"Recent advances in chemistry of high-spin nitrenes","authors":"S. Chapyshev, D. Korchagin, E. Y. Misochko","doi":"10.1070/RCR4965","DOIUrl":"https://doi.org/10.1070/RCR4965","url":null,"abstract":"Experimental and theoretical studies on aromatic nitrenes bearing from three to six unpaired electrons and having quartet, quintet, sextet or septet ground spin states, published in the last 15 years are analyzed. A comparative analysis of the magnetic properties of high-spin nitrenes and all other known high-spin organic molecules is performed. Promising areas of practical application of high-spin nitrenes as molecular magnets and as qubits and qudits for quantum computations are discussed. The bibliography includes 214 references.","PeriodicalId":21523,"journal":{"name":"Russian Chemical Reviews","volume":"90 1","pages":"39 - 69"},"PeriodicalIF":7.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59008223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：