Pub Date : 2019-09-26DOI: 10.22204/2410-4639-2019-103-03-14-25
R. Gainutdinov, Ya. V. Bodnarchuk, S. Lavrov
In this review our recent results on the electron-beam domain writing (EBDW) on the nonpolar surfaces of LiNbO3 crystals of different compositions are presented. The obtained results permitted us to relate the main characteristics of domain formation (the domain sizes and velocity Vf of the frontal motion) to the irradiation conditions (the accelerating voltage U of scanning electron microscopy, EB-current I, the inserted charge Q). The domain depth Td is controlled by U via the electron penetration depth; the domain length Ld increases linearly with Q owing to the domain frontal growth by the viscous friction law. In optical waveguides, the matching of the Td value with the waveguide thickness D provides optimal values of the waveguide conversion to the second harmonic
{"title":"Electron-Beam Domain Patterning on the Nonpolar Surfaces of LiNbO3 Crystals and in Optical Waveguides Formed on the Nonpolar Surfaces","authors":"R. Gainutdinov, Ya. V. Bodnarchuk, S. Lavrov","doi":"10.22204/2410-4639-2019-103-03-14-25","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-103-03-14-25","url":null,"abstract":"In this review our recent results on the electron-beam domain writing (EBDW) on the nonpolar surfaces of LiNbO3 crystals of different compositions are presented. The obtained results permitted us to relate the main characteristics of domain formation (the domain sizes and velocity Vf of the frontal motion) to the irradiation conditions (the accelerating voltage U of scanning electron microscopy, EB-current I, the inserted charge Q). The domain depth Td is controlled by U via the electron penetration depth; the domain length Ld increases linearly with Q owing to the domain frontal growth by the viscous friction law. In optical waveguides, the matching of the Td value with the waveguide thickness D provides optimal values of the waveguide conversion to the second harmonic","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"39 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132467021","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 : 2019-07-31DOI: 10.22204/2410-4639-2019-103-03-26-34
D. Kurtina, A. Garshev, L. D. Kozina, R. Vasiliev
The article describes the main features of a new class of colloidal nanoparticles with the electronic structure of semiconductor quantum wells – atomically-thin cadmium selinide CdSe and cadmium telluride CdTe nanosheets with a thickness of 1-2 nm and extended lateral sizes in the range of 100–700 nm. Approaches to the synthesis of such nanostructures by wet chemical methods are considered. A new effect of spontaneous folding induced by ligand exchange has been described.
{"title":"Atomically-Thin CdSe and CdTe Colloidal Nanosheets: Growth, Crystal Structure, and Optical Properties","authors":"D. Kurtina, A. Garshev, L. D. Kozina, R. Vasiliev","doi":"10.22204/2410-4639-2019-103-03-26-34","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-103-03-26-34","url":null,"abstract":"The article describes the main features of a new class of colloidal nanoparticles with the electronic structure of semiconductor quantum wells – atomically-thin cadmium selinide CdSe and cadmium telluride CdTe nanosheets with a thickness of 1-2 nm and extended lateral sizes in the range of 100–700 nm. Approaches to the synthesis of such nanostructures by wet chemical methods are considered. A new effect of spontaneous folding induced by ligand exchange has been described.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126620885","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 : 2019-07-31DOI: 10.22204/2410-4639-2019-103-03-59-77
P. Fedorov, A. Luginina, S. Kuznetsov
The luminescent hydrophobic composite films based on nanocellulose matrix with up-conversion SrF2 :Ho or CaF2 :Ho particles have been synthesized and studied by X-ray diffraction, electron microscopy and optical spectroscopy techniques. The size distributions of cellulose nanoparticles in homogeneous aqueous dispersions of cellulose nanocrystals (CNC), cellulose nanofibrils (CNF) and TEMPO-oxidized nanocellulose (TOCN) were determined. Flexible, durable, translucent composite films were obtained by molding from the said CNC/CNF or TOCN suspensions and up-conversion particles. Optical transmission, spectral-luminescent properties, surface morphology, degree of polymerization, structure and crystallinity index of nanocellulose, surface hydrophobization conditions of the said CNC/CNF or TOCN composite films have been determined. The manufactured up-conversion hydrophobic composite films can be utilized as potential photonics materials (in particular, materials for the visualization of near-infrared laser radiation), as luminescent labels, luminescent detectors, etc.
{"title":"Nanocomposites of Cellulose with Up-Conversion Phosphors for Photonics: Synthesis, Structure, Optical Properties","authors":"P. Fedorov, A. Luginina, S. Kuznetsov","doi":"10.22204/2410-4639-2019-103-03-59-77","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-103-03-59-77","url":null,"abstract":"The luminescent hydrophobic composite films based on nanocellulose matrix with up-conversion SrF2 :Ho or CaF2 :Ho particles have been synthesized and studied by X-ray diffraction, electron microscopy and optical spectroscopy techniques. The size distributions of cellulose nanoparticles in homogeneous aqueous dispersions of cellulose nanocrystals (CNC), cellulose nanofibrils (CNF) and TEMPO-oxidized nanocellulose (TOCN) were determined. Flexible, durable, translucent composite films were obtained by molding from the said CNC/CNF or TOCN suspensions and up-conversion particles. Optical transmission, spectral-luminescent properties, surface morphology, degree of polymerization, structure and crystallinity index of nanocellulose, surface hydrophobization conditions of the said CNC/CNF or TOCN composite films have been determined. The manufactured up-conversion hydrophobic composite films can be utilized as potential photonics materials (in particular, materials for the visualization of near-infrared laser radiation), as luminescent labels, luminescent detectors, etc.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"2 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134259662","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 : 2019-07-31DOI: 10.22204/2410-4639-2019-103-03-107-128
S. A. Aseyev, A. Ischenko, I. Kochikov, B. Mironov, E. Ryabov, Yury A. Zhabanov, V. Kompanets, A. L. Malinovskii, A. Otlyotov, S. Chekalin
Study of the structural dynamics of matter by methods with high spatially-temporal resolution represents new direction in modern science and provides the understanding of relationship inside the "structure – dynamics – property" triad in the field of physics, chemistry, biology and materials science. Application of femto and attosecond laser pulses for excitation and formation of synchronized ultrashort photoelectron bunches for probing makes it possible to observe coherent dynamics of nuclei and electrons in samples on necessary space-time scales. Using laser spectroscopy one can determine energy levels of the sample and trace their evolution over time. However, the extraction of the structural dynamics of matter from this information is achieved by indirect methods. In the paper authors demonstrate the direct approaches to the study of the coherent dynamics of the nuclei of laser-excited matter in the space-time continuum (4D), based on probing the object with ultra-short electron or X-ray pulses, and describe their experiments, which were carried out using ultrafast electron diffractometer and transmission electron microscope at the Institute of Spectroscopy RAS.
{"title":"4D-Structural Dynamics of the Transition State: Free Molecules, Clusters and Nanocrystals","authors":"S. A. Aseyev, A. Ischenko, I. Kochikov, B. Mironov, E. Ryabov, Yury A. Zhabanov, V. Kompanets, A. L. Malinovskii, A. Otlyotov, S. Chekalin","doi":"10.22204/2410-4639-2019-103-03-107-128","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-103-03-107-128","url":null,"abstract":"Study of the structural dynamics of matter by methods with high spatially-temporal resolution represents new direction in modern science and provides the understanding of relationship inside the \"structure – dynamics – property\" triad in the field of physics, chemistry, biology and materials science. Application of femto and attosecond laser pulses for excitation and formation of synchronized ultrashort photoelectron bunches for probing makes it possible to observe coherent dynamics of nuclei and electrons in samples on necessary space-time scales. Using laser spectroscopy one can determine energy levels of the sample and trace their evolution over time. However, the extraction of the structural dynamics of matter from this information is achieved by indirect methods. In the paper authors demonstrate the direct approaches to the study of the coherent dynamics of the nuclei of laser-excited matter in the space-time continuum (4D), based on probing the object with ultra-short electron or X-ray pulses, and describe their experiments, which were carried out using ultrafast electron diffractometer and transmission electron microscope at the Institute of Spectroscopy RAS.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122463444","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 : 2019-07-31DOI: 10.22204/2410-4639-2019-103-03-78-92
A. V. Gritsienko, N. S. Kurochkin, S. P. Eliseev, A. Vitukhnovsky
In this paper, we review antennas from the radio wave band to the optical band. The main characteristics of the antennas determining their operation are given. The class of nano-patch antennas (NPA) of the visible and near-infrared ranges is distinguished. The advantage of nano-patch antennas is the good directivity of the antenna radiation and the significant Purcell factor (>102 –103 ), while the technology for creating these antennas is quite simple. The paper also presents various types of photon radiation sources in NPA, among which molecular complexes, quantum dots and color centers in diamonds can be distinguished. On the basis of nano-patch antennas with quantum dots and color centers in nanodiamonds, it is possible to create sources of single photons with picosecond decay rates. The comparison of the characteristics of NPA depending on the shape of plasmon nanoparticles is presented.
{"title":"Nano-Patch Antennas as an Evolution of Optical Antennas","authors":"A. V. Gritsienko, N. S. Kurochkin, S. P. Eliseev, A. Vitukhnovsky","doi":"10.22204/2410-4639-2019-103-03-78-92","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-103-03-78-92","url":null,"abstract":"In this paper, we review antennas from the radio wave band to the optical band. The main characteristics of the antennas determining their operation are given. The class of nano-patch antennas (NPA) of the visible and near-infrared ranges is distinguished. The advantage of nano-patch antennas is the good directivity of the antenna radiation and the significant Purcell factor (>102 –103 ), while the technology for creating these antennas is quite simple. The paper also presents various types of photon radiation sources in NPA, among which molecular complexes, quantum dots and color centers in diamonds can be distinguished. On the basis of nano-patch antennas with quantum dots and color centers in nanodiamonds, it is possible to create sources of single photons with picosecond decay rates. The comparison of the characteristics of NPA depending on the shape of plasmon nanoparticles is presented.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122275938","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 : 2019-07-31DOI: 10.22204/2410-4639-2019-103-03-35-45
V. Soifer, N. Golovastikov, L. Doskolovich, E. Bezus, D. Bykov
We propose two simple planar structures that enable spatial differentiation of the profile of optical beams propagating in a slab waveguide. The differentiator operating in transmission consists of a single subwavelength dielectric ridge on the surface of a slab waveguide. The differentiator operating in reflection consists of two grooves on the surface of a slab waveguide. In both cases the differentiation is performed at oblique incidence of the beam and is associated with the resonant excitation of the considered structures eigenmodes localized at the ridge or at the ridge between two grooves. It is shown that the required balance between the differentiation quality and the amplitude of the differentiated beam can be achieved by manipulating the quality factor of the resonance. The presented numerical simulation results demonstrate high-quality differentiation. The proposed differentiator may find application in ultrafast analog computing and signal processing systems.
{"title":"Differentiation of Optical Signals with Dielectric Ridges on Top of a Slab Waveguide","authors":"V. Soifer, N. Golovastikov, L. Doskolovich, E. Bezus, D. Bykov","doi":"10.22204/2410-4639-2019-103-03-35-45","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-103-03-35-45","url":null,"abstract":"We propose two simple planar structures that enable spatial differentiation of the profile of optical beams propagating in a slab waveguide. The differentiator operating in transmission consists of a single subwavelength dielectric ridge on the surface of a slab waveguide. The differentiator operating in reflection consists of two grooves on the surface of a slab waveguide. In both cases the differentiation is performed at oblique incidence of the beam and is associated with the resonant excitation of the considered structures eigenmodes localized at the ridge or at the ridge between two grooves. It is shown that the required balance between the differentiation quality and the amplitude of the differentiated beam can be achieved by manipulating the quality factor of the resonance. The presented numerical simulation results demonstrate high-quality differentiation. The proposed differentiator may find application in ultrafast analog computing and signal processing systems.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132651566","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 : 2019-07-31DOI: 10.22204/2410-4639-2019-103-03-93-106
D. Kryuchkov, G. Vishnyakova, K. Khabarova, K. Kudeyarov, N. Zhadnov, N. Kolachevsky
Here we consider creation of laser systems stabilized by external macroscopic monolithic Fabry – Perot cavities made of single-crystalline silicon operating at cryogenic temperatures. Fundamental thermal noise floor for fractional frequency instability was evaluated with its dependency on cavity’s spacer, mirror’s substrate and coatings material. Silicon cavities with dielectric SiO2 /Ta2 O5 and crystalline GaAs/InGaAs mirror coatings were created, its finesse at room temperatures was investigated. Two ultra-high vacuum optical cryostats were developed. Two ultra-stable laser systems based on cavities with dielectric mirrors were assembled. Comparison scheme via beat signal frequency counting was implemented for the characterization purpose. Different noise sources presenting at assembled systems are considered. Its impact to relative frequency instability of our laser systems is being explored.
{"title":"Contribution of Different Noise Sources to the Relative Instability of Laser Systems Stabilized by External Silicon Cavities","authors":"D. Kryuchkov, G. Vishnyakova, K. Khabarova, K. Kudeyarov, N. Zhadnov, N. Kolachevsky","doi":"10.22204/2410-4639-2019-103-03-93-106","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-103-03-93-106","url":null,"abstract":"Here we consider creation of laser systems stabilized by external macroscopic monolithic Fabry – Perot cavities made of single-crystalline silicon operating at cryogenic temperatures. Fundamental thermal noise floor for fractional frequency instability was evaluated with its dependency on cavity’s spacer, mirror’s substrate and coatings material. Silicon cavities with dielectric SiO2 /Ta2 O5 and crystalline GaAs/InGaAs mirror coatings were created, its finesse at room temperatures was investigated. Two ultra-high vacuum optical cryostats were developed. Two ultra-stable laser systems based on cavities with dielectric mirrors were assembled. Comparison scheme via beat signal frequency counting was implemented for the characterization purpose. Different noise sources presenting at assembled systems are considered. Its impact to relative frequency instability of our laser systems is being explored.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123128794","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 : 2019-07-31DOI: 10.22204/2410-4639-2019-103-03-46-58
N. Titova, N. Tovpeko, A. Kardakova, G. Goltsman
Modern technologies of photonics, astrophysics, medicine and security systems have a demand for development of new types of sensitive detectors and/or optimization of existing ones. As an example, a strong demand exists for improvement of the characteristics of highly sensitive detectors based on superconducting materials. One way to optimize the performance of such detectors is to select a suitable superconducting material. This is due to the fact that the technical characteristics of devices are determined by relaxation mechanisms of nonequilibrium processes that occur in the material upon absorption of electromagnetic radiation. In this paper, we focused on the study of the relaxation of nonequilibrium processes in superconducting materials such as highly boron-doped polycrystalline diamond films, highly disordered titanium nitride (TiN) films and ultrathin amorphous tungsten silicide films (WSi). The experimental data allowed us to determine the temperature dependence of the inelastic relaxation time in the studied materials. These results can help us to evaluate the applicability of these materials for the different types of superconducting detectors.
{"title":"Promising Superconducting Materials for Highly Sensitive Detectors of the Infrared and Terahertz Ranges","authors":"N. Titova, N. Tovpeko, A. Kardakova, G. Goltsman","doi":"10.22204/2410-4639-2019-103-03-46-58","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-103-03-46-58","url":null,"abstract":"Modern technologies of photonics, astrophysics, medicine and security systems have a demand for development of new types of sensitive detectors and/or optimization of existing ones. As an example, a strong demand exists for improvement of the characteristics of highly sensitive detectors based on superconducting materials. One way to optimize the performance of such detectors is to select a suitable superconducting material. This is due to the fact that the technical characteristics of devices are determined by relaxation mechanisms of nonequilibrium processes that occur in the material upon absorption of electromagnetic radiation. In this paper, we focused on the study of the relaxation of nonequilibrium processes in superconducting materials such as highly boron-doped polycrystalline diamond films, highly disordered titanium nitride (TiN) films and ultrathin amorphous tungsten silicide films (WSi). The experimental data allowed us to determine the temperature dependence of the inelastic relaxation time in the studied materials. These results can help us to evaluate the applicability of these materials for the different types of superconducting detectors.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"70 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122650049","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 : 2019-06-25DOI: 10.22204/2410-4639-2019-102-02-58-73
I. V. Lapshin, A. Kissel, A. Trifonov
In accordance with United Nations General Assembly resolution, the year 2019 was proclaimed the International Year of the Periodic Table of Chemical Elements. Rare-earth elements were discovered during the time of the Periodic System development. In the past few decades, their compounds have attracted great interest due to their unique reactivity. This review covers recent achievements in the field of intermolecular hydrophosphination of alkenes, dienes and alkynes, which is catalyzed by rare earth and alkaline-earth metal complexes. Catalytic hydrophosphination reaction is the addition of an P—H bond to С—С multiple bonds, and offers an efficient and elegant synthetic approach to production of the organophosphorus compounds widely used in industrial synthesis, pharmaceuticals, agrochemistry, and other areas. The high values of the ionic radii of rare earth and alkaline-earth metals in combination with the Lewis acidity provide their compounds with a pronounced tendency to complex formation and, accordingly, high coordination numbers. Due to high reactivity of M—E (E = C, H, N, P) bonds, ease of Ln—P ı-bond metathesis and multiple C—C bond insertions, these compounds offer new prospects for the catalysis of the alkenes and alkynes hydrophosphination. Therefore, complexes of non-toxic and relatively abundant in nature rare earth and alkaline earth metals can be a cheaper and more effective alternative to compounds of late transition metals in the catalysis of the C—P bond formation.
根据联合国大会决议，宣布2019年为化学元素周期表国际年。稀土元素是在周期系统发展时期发现的。在过去的几十年里，它们的化合物因其独特的反应性而引起了人们的极大兴趣。本文综述了稀土和碱土金属配合物催化烯烃、二烯烃和炔烃分子间加氢磷化反应的最新进展。催化氢化反应是将P-H键加到С -С多个键上，为生产有机磷化合物提供了一种高效、简便的合成方法，广泛应用于工业合成、制药、农业化学和其他领域。稀土和碱土金属的高离子半径值与刘易斯酸度相结合，使它们的化合物具有明显的络合物形成倾向，因此具有高配位数。由于M-E (E = C, H, N, P)键具有较高的反应活性，易于Ln-P ı-bond复分解和多个C - C键插入，这些化合物在催化烯烃和炔烃加氢磷酸化方面具有新的前景。因此，无毒且相对丰富的天然稀土和碱土金属配合物可以替代晚期过渡金属化合物更便宜、更有效地催化C-P键的形成。
{"title":"Complexes of Rare- and Alkaline-Earth Elements in Catalytic Intermolecular Hydrophosphination of Multiple C—C Bonds","authors":"I. V. Lapshin, A. Kissel, A. Trifonov","doi":"10.22204/2410-4639-2019-102-02-58-73","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-102-02-58-73","url":null,"abstract":"In accordance with United Nations General Assembly resolution, the year 2019 was proclaimed the International Year of the Periodic Table of Chemical Elements. Rare-earth elements were discovered during the time of the Periodic System development. In the past few decades, their compounds have attracted great interest due to their unique reactivity. This review covers recent achievements in the field of intermolecular hydrophosphination of alkenes, dienes and alkynes, which is catalyzed by rare earth and alkaline-earth metal complexes. Catalytic hydrophosphination reaction is the addition of an P—H bond to С—С multiple bonds, and offers an efficient and elegant synthetic approach to production of the organophosphorus compounds widely used in industrial synthesis, pharmaceuticals, agrochemistry, and other areas. The high values of the ionic radii of rare earth and alkaline-earth metals in combination with the Lewis acidity provide their compounds with a pronounced tendency to complex formation and, accordingly, high coordination numbers. Due to high reactivity of M—E (E = C, H, N, P) bonds, ease of Ln—P ı-bond metathesis and multiple C—C bond insertions, these compounds offer new prospects for the catalysis of the alkenes and alkynes hydrophosphination. Therefore, complexes of non-toxic and relatively abundant in nature rare earth and alkaline earth metals can be a cheaper and more effective alternative to compounds of late transition metals in the catalysis of the C—P bond formation.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"121 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123179844","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 : 2019-06-25DOI: 10.22204/2410-4639-2019-102-02-82-100
A. Sidorov, M. Kiskin, A. Baranchikov, V. Ivanov, I. Eremenko
The authors discovered and investigated new types of stable heterometallic carboxylate complexes in which divalent transition metal atoms of the 4th period of the Periodic Table of Chemical Elements (V, Co, Ni, Cu, Zn) combine with atoms of lithium, magnesium, calcium or rare earth elements. These polynuclear heterometallic compounds retain their structure under conditions when the homometallic compounds of these transition metals decompose to mononuclear complexes. The different metals combination in one molecule allows us to use the obtained heterometallic compounds for producing disperse and film oxide materials, and bimetallic oxide catalysts. The stability of the complexes allows to immobilize them in various matrices and to assemble 3D polymer structures on their base. Since the metal ions under consideration (V, Co, Ni, Cu, Zn) are capable to form isostructural heterometallic compounds, it becomes possible to obtain compounds within a single structural type with a given combination of physical properties, determined by the nature of the metal ions.
{"title":"Methods for Synthesis of Molecular Materials with Unique Physical Properties","authors":"A. Sidorov, M. Kiskin, A. Baranchikov, V. Ivanov, I. Eremenko","doi":"10.22204/2410-4639-2019-102-02-82-100","DOIUrl":"https://doi.org/10.22204/2410-4639-2019-102-02-82-100","url":null,"abstract":"The authors discovered and investigated new types of stable heterometallic carboxylate complexes in which divalent transition metal atoms of the 4th period of the Periodic Table of Chemical Elements (V, Co, Ni, Cu, Zn) combine with atoms of lithium, magnesium, calcium or rare earth elements. These polynuclear heterometallic compounds retain their structure under conditions when the homometallic compounds of these transition metals decompose to mononuclear complexes. The different metals combination in one molecule allows us to use the obtained heterometallic compounds for producing disperse and film oxide materials, and bimetallic oxide catalysts. The stability of the complexes allows to immobilize them in various matrices and to assemble 3D polymer structures on their base. Since the metal ions under consideration (V, Co, Ni, Cu, Zn) are capable to form isostructural heterometallic compounds, it becomes possible to obtain compounds within a single structural type with a given combination of physical properties, determined by the nature of the metal ions.","PeriodicalId":122949,"journal":{"name":"Vestnik RFFI","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114300269","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}
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