首页 > 最新文献

Journal of Structural Chemistry最新文献

英文 中文
New Reactive Force Field for the Molecular Dynamics Simulation of Borate Systems 用于硼酸盐体系分子动力学模拟的新反应力场
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2025-02-12 DOI: 10.1134/S0022476625010159
L. A. Avakyan, A. V. Skidanenko, Ya. A. Vakulenko, E. A. Tretyakov, G. Yu. Shakhgyldyan, V. N. Sigaev, L. A. Bugaev

We propose a new reactive force field of the ReaxFF family. It is based on computations of model structures with a small number of atoms (no more than four) by density functional theory with dispersion corrections. Unlike the existing force fields, our force field provides the correct description of two polymorphs of crystalline oxide B2O3 that qualitatively differ in the coordination of boron atoms (triangularly and tetrahedrally coordinated boron atoms). The force field application is exemplified by the derivation of the atomic model of borate glass as a result of imitating the melt cooling process. The model quality is verified by comparing with the reported experimental neutron diffraction data.

{"title":"New Reactive Force Field for the Molecular Dynamics Simulation of Borate Systems","authors":"L. A. Avakyan,&nbsp;A. V. Skidanenko,&nbsp;Ya. A. Vakulenko,&nbsp;E. A. Tretyakov,&nbsp;G. Yu. Shakhgyldyan,&nbsp;V. N. Sigaev,&nbsp;L. A. Bugaev","doi":"10.1134/S0022476625010159","DOIUrl":"10.1134/S0022476625010159","url":null,"abstract":"<p>We propose a new reactive force field of the ReaxFF family. It is based on computations of model structures with a small number of atoms (no more than four) by density functional theory with dispersion corrections. Unlike the existing force fields, our force field provides the correct description of two polymorphs of crystalline oxide B<sub>2</sub>O<sub>3</sub> that qualitatively differ in the coordination of boron atoms (triangularly and tetrahedrally coordinated boron atoms). The force field application is exemplified by the derivation of the atomic model of borate glass as a result of imitating the melt cooling process. The model quality is verified by comparing with the reported experimental neutron diffraction data.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 1","pages":"165 - 175"},"PeriodicalIF":1.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388860","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
Effect of Laser Treatment on the Surface Resistance of Polymer Composites Modified by Multi-Walled Carbon Nanotubes 激光处理对多壁碳纳米管改性聚合物复合材料表面电阻的影响
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2025-02-12 DOI: 10.1134/S0022476625010172
S. I. Moseenkov, A. V. Zavorin, A. N. Serkova, B. A. Kolesov, V. L. Kuznetsov

Changes in the surface resistance of polyethylene based composite films modified by multi-walled carbon nanotubes (MWCNTs) as a result of laser treatment are studied. Composites containing uniformly distributed nanotubes throughout their volume are prepared by mechanical melt mixing. The composite surfaces are treated by a 1064 nm fiber laser while varying the pulse duration within the 3-120 ns range and the source power within the 0.6-21 W range, so that the surface energy density during processing is 0.1-18.3 J/cm2. The influence of laser treatment parameters on the surface structure of composites is studied by scanning electron microscopy and Raman spectroscopy, and the surface resistance is determined using a four-electrode circuit. It is established that the surface resistance of the MWCNT-modified polymer composites can be either decreased by 30-50 times or increased by up to 140 times by tuning the laser treatment parameters.

{"title":"Effect of Laser Treatment on the Surface Resistance of Polymer Composites Modified by Multi-Walled Carbon Nanotubes","authors":"S. I. Moseenkov,&nbsp;A. V. Zavorin,&nbsp;A. N. Serkova,&nbsp;B. A. Kolesov,&nbsp;V. L. Kuznetsov","doi":"10.1134/S0022476625010172","DOIUrl":"10.1134/S0022476625010172","url":null,"abstract":"<p>Changes in the surface resistance of polyethylene based composite films modified by multi-walled carbon nanotubes (MWCNTs) as a result of laser treatment are studied. Composites containing uniformly distributed nanotubes throughout their volume are prepared by mechanical melt mixing. The composite surfaces are treated by a 1064 nm fiber laser while varying the pulse duration within the 3-120 ns range and the source power within the 0.6-21 W range, so that the surface energy density during processing is 0.1-18.3 J/cm<sup>2</sup>. The influence of laser treatment parameters on the surface structure of composites is studied by scanning electron microscopy and Raman spectroscopy, and the surface resistance is determined using a four-electrode circuit. It is established that the surface resistance of the MWCNT-modified polymer composites can be either decreased by 30-50 times or increased by up to 140 times by tuning the laser treatment parameters.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 1","pages":"188 - 200"},"PeriodicalIF":1.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388765","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
Crystal Structure of 3β-Hydroxy-19β,28-Expoxy-18α-Olean (allobetulin) 3β-Hydroxy-19β,28-Expoxy-18α-Olean (allobetulin)的晶体结构
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2025-02-12 DOI: 10.1134/S0022476625010068
Yu. D. Razgulyaeva, A. V. Zaytsev, A. A. Bakibaev

The crystal structure of allobetulin contained in birch bark as a minor component is determined. Allobetulin crystallizes in the monoclinic system in the space group P21, Z = 4. The unit cell parameters are determined as follows: a = 13.2600(9) Å, b = 12.6245(10) Å, c = 15.4702(11) Å; β = 95.425(7)°, V = 2578.1(3) Å3. Allobetulin molecules form a layered crystal packing of supramolecular chains.

{"title":"Crystal Structure of 3β-Hydroxy-19β,28-Expoxy-18α-Olean (allobetulin)","authors":"Yu. D. Razgulyaeva,&nbsp;A. V. Zaytsev,&nbsp;A. A. Bakibaev","doi":"10.1134/S0022476625010068","DOIUrl":"10.1134/S0022476625010068","url":null,"abstract":"<p>The crystal structure of allobetulin contained in birch bark as a minor component is determined. Allobetulin crystallizes in the monoclinic system in the space group <i>P</i>2<sub>1</sub>, <i>Z</i> = 4. The unit cell parameters are determined as follows: <i>a</i> = 13.2600(9) Å, <i>b</i> = 12.6245(10) Å, <i>c</i> = 15.4702(11) Å; β = 95.425(7)°, <i>V</i> = 2578.1(3) Å<sup>3</sup>. Allobetulin molecules form a layered crystal packing of supramolecular chains.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 1","pages":"73 - 77"},"PeriodicalIF":1.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388816","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
Anisotropic Broadening of Diffraction Peaks of Metallic Cobalt: Determining Parameters of a Nanoheterogeneous Domain Structure
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2025-02-12 DOI: 10.1134/S002247662501010X
S. V. Cherepanova, D. A. Yatsenko, E. Y. Gerasimov

The disordered structure of metallic cobalt nanoparticles prepared by the in situ Co3O4 and Co2.95Al0.05O4 reduction at different temperatures is characterized. According to the transmission electron microscopy data, individual particles have a stripe contrast indicating that they consist of plate-like domains with different structures. The main feature of the recorded XRD patterns is the anisotropic peak broadening. The Rietveld analysis shows that the model represented by homogeneous particles with hcp and/or fcc structures does not agree well with the experiment. The XRD patterns calculated using statistical models of 1D disordered crystals show that metallic cobalt particles are heterogeneous and consist of plate-like domains with hcp and fcc structures. The dependences of diffraction peak parameters on the thickness of two types of domains are determined; the corresponding calibration graphs are constructed. The phase composition and domain structure parameters are determined as functions of temperature for two series of metallic particles.

{"title":"Anisotropic Broadening of Diffraction Peaks of Metallic Cobalt: Determining Parameters of a Nanoheterogeneous Domain Structure","authors":"S. V. Cherepanova,&nbsp;D. A. Yatsenko,&nbsp;E. Y. Gerasimov","doi":"10.1134/S002247662501010X","DOIUrl":"10.1134/S002247662501010X","url":null,"abstract":"<p>The disordered structure of metallic cobalt nanoparticles prepared by the in situ Co<sub>3</sub>O<sub>4</sub> and Co<sub>2.95</sub>Al<sub>0.05</sub>O<sub>4</sub> reduction at different temperatures is characterized. According to the transmission electron microscopy data, individual particles have a stripe contrast indicating that they consist of plate-like domains with different structures. The main feature of the recorded XRD patterns is the anisotropic peak broadening. The Rietveld analysis shows that the model represented by homogeneous particles with hcp and/or fcc structures does not agree well with the experiment. The XRD patterns calculated using statistical models of 1D disordered crystals show that metallic cobalt particles are heterogeneous and consist of plate-like domains with hcp and fcc structures. The dependences of diffraction peak parameters on the thickness of two types of domains are determined; the corresponding calibration graphs are constructed. The phase composition and domain structure parameters are determined as functions of temperature for two series of metallic particles.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 1","pages":"108 - 119"},"PeriodicalIF":1.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388825","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
Syntheses, Crystal Structure, Hirshfeld Surface Analyses of Cocrystals and Salt of a Flexible Imidazole Tethered Naphthalenediimide with Some Organic Acids 柔性咪唑系链萘二亚胺与某些有机酸的共晶体和盐的合成、晶体结构、Hirshfeld 表面分析
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2025-02-12 DOI: 10.1134/S0022476625010032
J. K. Nath

One salt and three cocrystals of 2,7-bis(3-(1H-imidazol-1-yl)propyl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetraone (L) have been synthesized and reported. 3-Nitro benzoic acid (3NBA) forms salt with L and 4-Nitro benzoic acid (4NBA), 4-hydroxy benzoic acid (4HBA) and 4-amino benzoic acid (4ABA) form cocrystals with L. L forms 1:1 salt with 3-NBA and 1:1 cocrystal with 4-NBA, 4-HBA and 4-ABA, respectively. All the complexes were formed in a warm solvent condition. The solid-state structures were determined by single crystal X-ray diffraction method. Salt 1 exhibits zig zag tetrameric water cluster in the solid-state structure. Various types of supramolecular interactions such as O–H⋯O, C–H⋯O, π⋯π, and C–H⋯π were observed in the X-ray structures and all these interactions guide the formation of 3D supramolecular architecture in the solid state of all the complexes. Besides, the 2D fingerprint (2D-FP) and Hirshfeld surface analysis (HSA) computations were served to prove the 2D network packed crystal lattice interactions.

{"title":"Syntheses, Crystal Structure, Hirshfeld Surface Analyses of Cocrystals and Salt of a Flexible Imidazole Tethered Naphthalenediimide with Some Organic Acids","authors":"J. K. Nath","doi":"10.1134/S0022476625010032","DOIUrl":"10.1134/S0022476625010032","url":null,"abstract":"<p>One salt and three cocrystals of 2,7-bis(3-(1<i>H</i>-imidazol-1-yl)propyl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2<i>H</i>,7<i>H</i>)-tetraone (<b>L</b>) have been synthesized and reported. 3-Nitro benzoic acid (3NBA) forms salt with L and 4-Nitro benzoic acid (4NBA), 4-hydroxy benzoic acid (4HBA) and 4-amino benzoic acid (4ABA) form cocrystals with <b>L</b>. L forms 1:1 salt with 3-NBA and 1:1 cocrystal with 4-NBA, 4-HBA and 4-ABA, respectively. All the complexes were formed in a warm solvent condition. The solid-state structures were determined by single crystal X-ray diffraction method. Salt 1 exhibits zig zag tetrameric water cluster in the solid-state structure. Various types of supramolecular interactions such as O–H⋯O, C–H⋯O, π⋯π, and C–H⋯π were observed in the X-ray structures and all these interactions guide the formation of 3D supramolecular architecture in the solid state of all the complexes. Besides, the 2D fingerprint (2D-FP) and Hirshfeld surface analysis (HSA) computations were served to prove the 2D network packed crystal lattice interactions.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 1","pages":"30 - 45"},"PeriodicalIF":1.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388822","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, Characterization, FTIR and UV-Vis of a Novel Compound (E)-3-(5-bromo-3-fluoro-2-hydroxybenzilide amino)Benzaldehyde 新型化合物 (E)-3-(5-bromo-3-fluoro-2-hydroxybenzilide amino)Benzaldehyde 的合成、表征、傅立叶变换红外光谱 (FTIR) 和紫外可见光谱 (UV-Vis)
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2025-02-12 DOI: 10.1134/S0022476625010111
S. Kalecik, E. Güzel, H. E. Gürbüz, F. Kavraz, E. Ağar, M. Yavuz

One of the most studied compound families in the field of crystallography is the Schiff-based compounds. The basis of this research article is a newly synthesized Schiff-base compound. This research aims to investigate the synthesized (E)-3-(5-bromo-3-fluoro-2-hydroxybenzilide amino)benzaldehyde phenol compound using experimental methods. FTIR, UV-Vis and X-ray diffraction methods were used to elucidate the structural properties of the compound synthesized at the end of chemical processes. The structure solution was carried out from the data obtained as a result of X-ray analysis. According to these results, a molecule was formed in the asymmetric cell. The resulting structure has shaped in enol-imine form. The number of molecules in the unit cell was also determined as 4 (Z = 4). According to the results obtained as a result of UV-Vis spectroscopy, the structure revealed that the enol-imine form was dominant. The reasons for this situation were explained.

{"title":"Synthesis, Characterization, FTIR and UV-Vis of a Novel Compound (E)-3-(5-bromo-3-fluoro-2-hydroxybenzilide amino)Benzaldehyde","authors":"S. Kalecik,&nbsp;E. Güzel,&nbsp;H. E. Gürbüz,&nbsp;F. Kavraz,&nbsp;E. Ağar,&nbsp;M. Yavuz","doi":"10.1134/S0022476625010111","DOIUrl":"10.1134/S0022476625010111","url":null,"abstract":"<p>One of the most studied compound families in the field of crystallography is the Schiff-based compounds. The basis of this research article is a newly synthesized Schiff-base compound. This research aims to investigate the synthesized (<i>E</i>)-3-(5-bromo-3-fluoro-2-hydroxybenzilide amino)benzaldehyde phenol compound using experimental methods. FTIR, UV-Vis and X-ray diffraction methods were used to elucidate the structural properties of the compound synthesized at the end of chemical processes. The structure solution was carried out from the data obtained as a result of X-ray analysis. According to these results, a molecule was formed in the asymmetric cell. The resulting structure has shaped in enol-imine form. The number of molecules in the unit cell was also determined as 4 (<i>Z</i> = 4). According to the results obtained as a result of UV-Vis spectroscopy, the structure revealed that the enol-imine form was dominant. The reasons for this situation were explained.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 1","pages":"120 - 128"},"PeriodicalIF":1.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388843","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, Crystal Structure and Bioactivities of Schiff Base Derived from Paeonol and 1,4-Bis(3-aminopropyl)Piperazine
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2025-02-12 DOI: 10.1134/S0022476625010123
Y. W. Huang, T. T. Xu, H. S. Wan, M. Gao, C. Wang, R. B. Xu

A new Schiff base, paeonol-[1,4-bis(3-aminopropyl)piperazine], was synthesized for the first time by the condensation reaction of paeonol and 1,4-bis(3-aminopropyl)piperazine through solution method. The product was characterized by the methods of melting point, IR, UV-Vis, fluorescence spectrum, 1H NMR, elemental and thermal analysis, and its crystal structure was analyzed by single crystal X-ray diffraction method, which indicated that it belongs to triclinic system, (Pbar{1}) group, a = 6.836(14) Å, b = 7.729(17) Å, c = 12.28(3) Å, α = 87.25(2)°, β = 85.53(2)°, γ = 88.74(2)°. The antioxidant and in vitro antibacterial activities of the product were investigated by DPPH method and agar plate diffusion method, respectively. Moreover, the interaction of the product with biomacromolecule DNA was studied by the electronic spectroscopy and viscosity method.

{"title":"Synthesis, Crystal Structure and Bioactivities of Schiff Base Derived from Paeonol and 1,4-Bis(3-aminopropyl)Piperazine","authors":"Y. W. Huang,&nbsp;T. T. Xu,&nbsp;H. S. Wan,&nbsp;M. Gao,&nbsp;C. Wang,&nbsp;R. B. Xu","doi":"10.1134/S0022476625010123","DOIUrl":"10.1134/S0022476625010123","url":null,"abstract":"<p>A new Schiff base, paeonol-[1,4-bis(3-aminopropyl)piperazine], was synthesized for the first time by the condensation reaction of paeonol and 1,4-bis(3-aminopropyl)piperazine through solution method. The product was characterized by the methods of melting point, IR, UV-Vis, fluorescence spectrum, <sup>1</sup>H NMR, elemental and thermal analysis, and its crystal structure was analyzed by single crystal X-ray diffraction method, which indicated that it belongs to triclinic system, <span>(Pbar{1})</span> group, <i>a</i> = 6.836(14) Å, <i>b</i> = 7.729(17) Å, <i>c</i> = 12.28(3) Å, α = 87.25(2)°, β = 85.53(2)°, γ = 88.74(2)°. The antioxidant and <i>in vitro</i> antibacterial activities of the product were investigated by DPPH method and agar plate diffusion method, respectively. Moreover, the interaction of the product with biomacromolecule DNA was studied by the electronic spectroscopy and viscosity method.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 1","pages":"129 - 138"},"PeriodicalIF":1.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388844","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
Micro- and Nanostructure of the Surface of Polycrystalline Platinum Foil in the Oxygen Atmosphere at 1000-1400 K 1000-1400 K 氧气环境下多晶铂箔表面的微观和纳米结构
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2025-02-12 DOI: 10.1134/S0022476625010044
A. N. Salanov, A. N. Serkova, A. S. Zhirnova, L. A. Isupova

The micro- and nanostructure of the surface of polycrystalline platinum foil (Pt(poly)) after annealing in the O2 atmosphere at PO2 = 0.2 bar and 1 bar and T = 1000-1400 K is analyzed by scanning electron microscopy (SEM), powder X-ray diffraction, and electron backscatter diffraction (EBSD). With an increase in the temperature from 1000 K to 1400 K the main part of grains maintains the surface structure close to the (110) face, with the grain surface rearranging from the (311) stair structure to the (100) surface structure, and partially to (111). At these temperatures the values of unit cell parameter a almost do not change in coherence scattering region D and appear to be close to those obtained for initial Pt(poly) (3.925 Å, 25 nm). In the electron secondary and backscatter mode, SEM images in the magnification range from ×100 to ×300k at E0 of 5 keV, 10 keV, and 20 keV demonstrate the microgranular structure with 10-150 µm (~30 µm) grains and different brightness levels, as well as the 10-100 nm high facet on the grain surface. The neighboring grains with different brightness contain facets of different shapes, sizes, and orientations. After annealing at 1100 K layered structures with a layer thickness up to 100 nm are found on the surface of bright grains while square and rectangular facets with step heights up to 100 nm and 25 nm respectively are observed on the surface of grains with gray and dark levels of brightness. The fixed level of brightness and the structure of facets can be related to the grain surface structure close to (111), (100), and (110) crystallographic planes respectively. At high temperatures (1000-1400 K) and O2 pressure (~1 bar) the surface can be densely covered with adsorbed Oads atoms stimulating the release of adsorbed Ptads atoms from the bulk to the surface. The high concentration of mobile Ptads atoms causes the surface rearrangement involving the formation of facets on the grain surface, which decrease the surface energy and form the stable surface structure.

{"title":"Micro- and Nanostructure of the Surface of Polycrystalline Platinum Foil in the Oxygen Atmosphere at 1000-1400 K","authors":"A. N. Salanov,&nbsp;A. N. Serkova,&nbsp;A. S. Zhirnova,&nbsp;L. A. Isupova","doi":"10.1134/S0022476625010044","DOIUrl":"10.1134/S0022476625010044","url":null,"abstract":"<p>The micro- and nanostructure of the surface of polycrystalline platinum foil (Pt(poly)) after annealing in the O<sub>2</sub> atmosphere at <i>P</i><sub>O2</sub> = 0.2 bar and 1 bar and <i>T</i> = 1000-1400 K is analyzed by scanning electron microscopy (SEM), powder X-ray diffraction, and electron backscatter diffraction (EBSD). With an increase in the temperature from 1000 K to 1400 K the main part of grains maintains the surface structure close to the (110) face, with the grain surface rearranging from the (311) stair structure to the (100) surface structure, and partially to (111). At these temperatures the values of unit cell parameter <i>a</i> almost do not change in coherence scattering region <i>D</i> and appear to be close to those obtained for initial Pt(poly) (3.925 Å, 25 nm). In the electron secondary and backscatter mode, SEM images in the magnification range from ×100 to ×300k at <i>E</i><sub>0</sub> of 5 keV, 10 keV, and 20 keV demonstrate the microgranular structure with 10-150 µm (~30 µm) grains and different brightness levels, as well as the 10-100 nm high facet on the grain surface. The neighboring grains with different brightness contain facets of different shapes, sizes, and orientations. After annealing at 1100 K layered structures with a layer thickness up to 100 nm are found on the surface of bright grains while square and rectangular facets with step heights up to 100 nm and 25 nm respectively are observed on the surface of grains with gray and dark levels of brightness. The fixed level of brightness and the structure of facets can be related to the grain surface structure close to (111), (100), and (110) crystallographic planes respectively. At high temperatures (1000-1400 K) and O<sub>2</sub> pressure (~1 bar) the surface can be densely covered with adsorbed O<sub>ads</sub> atoms stimulating the release of adsorbed Pt<sub>ads</sub> atoms from the bulk to the surface. The high concentration of mobile Pt<sub>ads</sub> atoms causes the surface rearrangement involving the formation of facets on the grain surface, which decrease the surface energy and form the stable surface structure.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"66 1","pages":"46 - 62"},"PeriodicalIF":1.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388766","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
Crystal Structures and Optical Properties of the Dithiophosphate Complexes [Pd{(RO)2PS2}2] (R = Et, Ph) 二硫代磷酸盐配合物[Pd{(RO)2PS2}2] (R = Et, Ph)的晶体结构和光学性质
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-12-27 DOI: 10.1134/S0022476624120047
Y. A. Bryleva, A. V. Mikheylis, L. A. Glinskaya

Molecular and crystal structures of the novel [Pd{(PhO)2PS2}2] complex and the known [Pd{(EtO)2PS2}2] complex are studied. According to the XRD data, [Pd{(RO)2PS2}2] (R = Et, Ph) compounds crystallize in centrosymmetric space groups, and their crystal structures consist of mononuclear complex molecules. The ({{(text{EtO})}_{2}}text{PS}_{2}^{-}) and ({{(text{PhO)}}_{2}}text{PS}_{2}^{-}) ions perform an S,S′-donor bidentate-chelating function leading to the formation of square-planar PdS4 coordination cores. The electronic absorption spectra of the solutions of these complexes are studied; the influence of the ({{(text{RO})}_{2}}text{PS}_{2}^{-}) ligand structure and the solvent polarity on the observed optical properties of the studied compounds is considered.

研究了新型[Pd{(PhO)2PS22}]配合物和已知的[Pd({EtO)2PS22}]配合物的分子和晶体结构。XRD数据表明,[Pd({RO)2PS22}] (R = Et, Ph)化合物在中心对称空间群中结晶,其晶体结构为单核络合分子。({{(text{EtO})}_{2}}text{PS}_{2}^{-})和({{(text{PhO)}}_{2}}text{PS}_{2}^{-})离子发挥S,S '给体双齿螯合作用,形成方形平面的PdS4配位核。研究了这些配合物溶液的电子吸收光谱;考虑了({{(text{RO})}_{2}}text{PS}_{2}^{-})配体结构和溶剂极性对所研究化合物光学性质的影响。
{"title":"Crystal Structures and Optical Properties of the Dithiophosphate Complexes [Pd{(RO)2PS2}2] (R = Et, Ph)","authors":"Y. A. Bryleva,&nbsp;A. V. Mikheylis,&nbsp;L. A. Glinskaya","doi":"10.1134/S0022476624120047","DOIUrl":"10.1134/S0022476624120047","url":null,"abstract":"<p>Molecular and crystal structures of the novel [Pd{(PhO)<sub>2</sub>PS<sub>2</sub>}<sub>2</sub>] complex and the known [Pd{(EtO)<sub>2</sub>PS<sub>2</sub>}<sub>2</sub>] complex are studied. According to the XRD data, [Pd{(<i>R</i>O)<sub>2</sub>PS<sub>2</sub>}<sub>2</sub>] (<i>R</i> = Et, Ph) compounds crystallize in centrosymmetric space groups, and their crystal structures consist of mononuclear complex molecules. The <span>({{(text{EtO})}_{2}}text{PS}_{2}^{-})</span> and <span>({{(text{PhO)}}_{2}}text{PS}_{2}^{-})</span> ions perform an <i>S</i>,<i>S</i>′-donor bidentate-chelating function leading to the formation of square-planar PdS<sub>4</sub> coordination cores. The electronic absorption spectra of the solutions of these complexes are studied; the influence of the <span>({{(text{RO})}_{2}}text{PS}_{2}^{-})</span> ligand structure and the solvent polarity on the observed optical properties of the studied compounds is considered.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"65 12","pages":"2395 - 2405"},"PeriodicalIF":1.2,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142890014","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
Gd2O3: Synthesis and X-Ray Diffraction Analysis of Single Crystals, Thermal Expansion in the Range of 90-490 K Gd2O3:单晶的合成及x射线衍射分析,在90-490 K范围内热膨胀
IF 1.2 4区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Pub Date : 2024-12-27 DOI: 10.1134/S0022476624120072
P. S. Serebrennikova, A. L. Kudryavtsev, N. G. Naumov, S. A. Gromilov

A fine crystalline sample of the cubic modification (space group (Iabar{3}), Z = 16) of gadolinium oxide (C-Gd2O3) is grown by the solution–melt technique. The single crystal X-ray diffraction analysis performed at 150 K and 298 K reveals a relative increase in the unit cell parameter by 0.08%. The parameter at 300 K is refined by two independent procedures: in Bond’s scheme (a = 10.8152(9) Å, relative error Δa/a = 8·10–5) and by calibrating the equatorial circumference according to the external reference (a = 10.8145(6) Å, relative error Δa/a = 5.1·10–5). The values obtained coincide within the experimental error with data for the polycrystalline reference described by the National Bureau of Standards of the United States. The dependence a(T) is studied in the range of 90-490 K with a step of 10 K. Experimental points are described by second degree polynomial a = 10.801 + 2.7·10–5T + 6.0·10–8T2.

采用溶液-熔体法制备了立方改性(空间群(Iabar{3}), Z = 16)氧化钆(C-Gd2O3)的细晶样品。在150 K和298 K下进行的单晶x射线衍射分析表明,单晶参数相对增加了0.08%. The parameter at 300 K is refined by two independent procedures: in Bond’s scheme (a = 10.8152(9) Å, relative error Δa/a = 8·10–5) and by calibrating the equatorial circumference according to the external reference (a = 10.8145(6) Å, relative error Δa/a = 5.1·10–5). The values obtained coincide within the experimental error with data for the polycrystalline reference described by the National Bureau of Standards of the United States. The dependence a(T) is studied in the range of 90-490 K with a step of 10 K. Experimental points are described by second degree polynomial a = 10.801 + 2.7·10–5T + 6.0·10–8T2.
{"title":"Gd2O3: Synthesis and X-Ray Diffraction Analysis of Single Crystals, Thermal Expansion in the Range of 90-490 K","authors":"P. S. Serebrennikova,&nbsp;A. L. Kudryavtsev,&nbsp;N. G. Naumov,&nbsp;S. A. Gromilov","doi":"10.1134/S0022476624120072","DOIUrl":"10.1134/S0022476624120072","url":null,"abstract":"<p>A fine crystalline sample of the cubic modification (space group <span>(Iabar{3})</span>, <i>Z</i> = 16) of gadolinium oxide (<i>C</i>-Gd<sub>2</sub>O<sub>3</sub>) is grown by the solution–melt technique. The single crystal X-ray diffraction analysis performed at 150 K and 298 K reveals a relative increase in the unit cell parameter by 0.08%. The parameter at 300 K is refined by two independent procedures: in Bond’s scheme (<i>a</i> = 10.8152(9) Å, relative error Δ<i>a</i>/<i>a</i> = 8·10<sup>–5</sup>) and by calibrating the equatorial circumference according to the external reference (<i>a</i> = 10.8145(6) Å, relative error Δ<i>a</i>/<i>a</i> = 5.1·10<sup>–5</sup>). The values obtained coincide within the experimental error with data for the polycrystalline reference described by the National Bureau of Standards of the United States. The dependence <i>a</i>(<i>T</i>) is studied in the range of 90-490 K with a step of 10 K. Experimental points are described by second degree polynomial <i>a</i> = 10.801 + 2.7·10<sup>–5</sup>T + 6.0·10<sup>–8</sup>T<sup>2</sup>.</p>","PeriodicalId":668,"journal":{"name":"Journal of Structural Chemistry","volume":"65 12","pages":"2429 - 2437"},"PeriodicalIF":1.2,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142890017","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
期刊
Journal of Structural Chemistry
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1