Tsuyoshi Kato, Shintaro Takahashi, A. Baceiredo, N. Saffon‐Merceron
The hydrosilylation reactions of dihydrosilylium ion, stabilized by coordination of a σ‐donating Ni(0) fragment, has been investigated. This complex with two reactive sites, dihydrosilylium and Ni(0) centers, readily reacts with diphenylacetylene via a selective mono‐hydrosilylation reaction to afford the corresponding Ni(0)‐stabilized (hydro)(vinyl)silylium ion. In the case of ethylene, three equivalents of olefin are consumed to give a cationic Ni(II)‐complex featuring a Bu‐Si+‐NiII‐Et moiety with a NHC‐supported Si atom. DFT calculations indicate that the hydrosilylation proceeds by a classical (Chalk‐Harrod type) mechanism with the assistance of NHC ligand moving between Si and Ni centers according to their stabilization requirements.
研究人员对通过配位σ-供体镍（0）片段而稳定的二氢硅烷基离子的氢化反应进行了研究。这种具有两个反应位点（二氢硅烷基和 Ni(0) 中心）的配合物很容易通过选择性单氢硅烷化反应与二苯基乙炔发生反应，生成相应的 Ni(0) 稳定化（氢）（乙烯基）硅烷基离子。在乙烯的情况下，消耗三当量的烯烃，得到阳离子 Ni(II)- 复合物，该复合物具有一个 Bu-Si+-NiII-Et 分子和一个 NHC 支持的硅原子。DFT 计算表明，在 NHC 配体的帮助下，氢硅烷化反应是通过经典（Chalk-Harrod 型）机理进行的，NHC 配体根据稳定要求在 Si 和 Ni 中心之间移动。
{"title":"Hydrosilylation Reactions with a Dihydrosilylium Ion Stabilized by Coordination of a σ‐Donating Ni(0) Ligand","authors":"Tsuyoshi Kato, Shintaro Takahashi, A. Baceiredo, N. Saffon‐Merceron","doi":"10.1002/zaac.202400062","DOIUrl":"https://doi.org/10.1002/zaac.202400062","url":null,"abstract":"The hydrosilylation reactions of dihydrosilylium ion, stabilized by coordination of a σ‐donating Ni(0) fragment, has been investigated. This complex with two reactive sites, dihydrosilylium and Ni(0) centers, readily reacts with diphenylacetylene via a selective mono‐hydrosilylation reaction to afford the corresponding Ni(0)‐stabilized (hydro)(vinyl)silylium ion. In the case of ethylene, three equivalents of olefin are consumed to give a cationic Ni(II)‐complex featuring a Bu‐Si+‐NiII‐Et moiety with a NHC‐supported Si atom. DFT calculations indicate that the hydrosilylation proceeds by a classical (Chalk‐Harrod type) mechanism with the assistance of NHC ligand moving between Si and Ni centers according to their stabilization requirements.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"72 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141357917","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}
Marc Hunsicker, Johannes Krebs, Michael Zimmer, Bernd Morgenstern, Volker Huch, D. Scheschkewitz
The synthesis of the phosphorus‐capped heptaphenylsilsesquioxane T7Ph7P is reported. We show that, unlike previous examples, it readily forms Lewis acid‐base adducts with boranes of different steric demand and the FeCO4 fragment. All complexes were characterized by multinuclear NMR and IR spectroscopy in solution and the solid state. The molecular structures of the adducts with BPh3 and B(C6F5)3 were determined from XRD suitable single crystals. The relative conformation of the Ph and C6F5 rings in T7Ph7P‐B(C6F5)3 suggests favorable π‐interactions, stabilizing the adducts to such a degree that attempts to activate H2 or CO2 were unsuccessful.
{"title":"Synthesis and ligand properties of silsesquioxane‐caged phosphite T7Ph7P","authors":"Marc Hunsicker, Johannes Krebs, Michael Zimmer, Bernd Morgenstern, Volker Huch, D. Scheschkewitz","doi":"10.1002/zaac.202400068","DOIUrl":"https://doi.org/10.1002/zaac.202400068","url":null,"abstract":"The synthesis of the phosphorus‐capped heptaphenylsilsesquioxane T7Ph7P is reported. We show that, unlike previous examples, it readily forms Lewis acid‐base adducts with boranes of different steric demand and the FeCO4 fragment. All complexes were characterized by multinuclear NMR and IR spectroscopy in solution and the solid state. The molecular structures of the adducts with BPh3 and B(C6F5)3 were determined from XRD suitable single crystals. The relative conformation of the Ph and C6F5 rings in T7Ph7P‐B(C6F5)3 suggests favorable π‐interactions, stabilizing the adducts to such a degree that attempts to activate H2 or CO2 were unsuccessful.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"112 38","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141362365","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}
Hans Jürgen Meyer, Markus Stöbele, Albert T Schwarz
The new binary metal carbodiimide La2S2(CN2) was synthesized via solid‐state metathesis reaction. The crystal structure was solved and refined on basis of single‐crystal X‐ray diffraction data with space group C2/m. The structure is represented by a layered structure, based on alternating layers of lanthanum, sulfide, and carbodiimide units. A close resemblance of the structure with that of La2O2C2 is discussed, as well as the less‐common coordination number seven of the lanthanum atom.
通过固态偏合成反应合成了新型二元金属碳二亚胺 La2S2(CN2)。根据单晶 X 射线衍射数据解析并完善了晶体结构，其空间群为 C2/m。晶体结构表现为层状结构，由镧、硫化物和碳化二亚胺单元交替组成。本文讨论了该结构与 La2O2C2 结构的相似性，以及镧原子较少见的配位数 7。
{"title":"The Mixed‐Anion compound La2S2(CN2)","authors":"Hans Jürgen Meyer, Markus Stöbele, Albert T Schwarz","doi":"10.1002/zaac.202400038","DOIUrl":"https://doi.org/10.1002/zaac.202400038","url":null,"abstract":"The new binary metal carbodiimide La2S2(CN2) was synthesized via solid‐state metathesis reaction. The crystal structure was solved and refined on basis of single‐crystal X‐ray diffraction data with space group C2/m. The structure is represented by a layered structure, based on alternating layers of lanthanum, sulfide, and carbodiimide units. A close resemblance of the structure with that of La2O2C2 is discussed, as well as the less‐common coordination number seven of the lanthanum atom.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"121 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141360528","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}
Jiarong Mai, Shuang Xia, Nan Wang, L. Fu, Lili Liu, Nengfei Yu, Yuping Wu, Rudolf Holze
Commercial graphite anodes face the problems of high preparation temperature and limited specific capacity in lithium‐ion batteries (LIBs). Amorphous carbon anode materials are prepared at low temperatures and have abundant sources of preparation. As a low‐cost carbon source material, anthracite has a practical application value in storing lithium as anode electrodes of LIBs. However, the capacity is not enough to meet the present increasing demand. We added CNTs to enhance the performance of anthracite‐based carbon anodes. The addition of CNTs significantly improves the electrical properties of amorphous carbon anode materials due to the good electronic conductivity. This anthracite‐based carbon with CNTs (A‐C) anode displays a specific cycling capacity of 360 mAh·g‐1 at the current density of 200 mA·g‐1 after 200 cycles in LIBs. We believe that the work has far‐reaching significance for improving the practicability of amorphous carbon anode materials.
{"title":"Adding CNTs into Anthracite towards High Performance Anode Materials for Lithium Ion Batteries","authors":"Jiarong Mai, Shuang Xia, Nan Wang, L. Fu, Lili Liu, Nengfei Yu, Yuping Wu, Rudolf Holze","doi":"10.1002/zaac.202400041","DOIUrl":"https://doi.org/10.1002/zaac.202400041","url":null,"abstract":"Commercial graphite anodes face the problems of high preparation temperature and limited specific capacity in lithium‐ion batteries (LIBs). Amorphous carbon anode materials are prepared at low temperatures and have abundant sources of preparation. As a low‐cost carbon source material, anthracite has a practical application value in storing lithium as anode electrodes of LIBs. However, the capacity is not enough to meet the present increasing demand. We added CNTs to enhance the performance of anthracite‐based carbon anodes. The addition of CNTs significantly improves the electrical properties of amorphous carbon anode materials due to the good electronic conductivity. This anthracite‐based carbon with CNTs (A‐C) anode displays a specific cycling capacity of 360 mAh·g‐1 at the current density of 200 mA·g‐1 after 200 cycles in LIBs. We believe that the work has far‐reaching significance for improving the practicability of amorphous carbon anode materials.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"104 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141361310","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}
Sb4O5Br2 crystallizes plate‐shaped in the monoclinic space group P21/c with the lattice parameters a=660.82(5) pm, b=513.71(4) pm, c=1346.35(9) pm and β=97.876(3)° for Z=2. Its crystal structure contains {[Sb4O5]2+} layers with connected [(Sb1)O3+1]5− ψ1‐units and undisturbed pyramidal [(Sb2)O3]3− ψ1‐units, where the free electron pair is counted as a pseudo‐ligand (ψ). The bromide anions required for charge compensation of these cationic {[Sb4O5]2+} layers form single sheets and are only bonded via van‐der‐Waals interactions in this crystal structure, as the nearest distance to antimony cations is at least 300 pm. NdSb2O4Br crystallizes plate‐shaped in the monoclinic space group P21/c as well, but with the lattice parameters a=896.24(6) pm, b=801.16(5) pm, c=799.27(5) pm and β=92.129(3)° for Z=4. The [NdO8]13− polyhedra are linked to each other via four edges and thus form fluorite‐related layers {[NdO ]5−}, which run parallel to the (100) plane. The [SbO3]3− anions share vertices to build chains {[SbO O ]−} along [001], which align parallel within the (100) plane. The isolated Br− anions arrange in layers and show a minimum distance of 319 pm to the next Sb3+ cation. ErSb2O4Br crystallizes plate‐shaped in the non‐centrosymmetric tetragonal space group P4212 with the lattice parameters a=774.76(4) pm, c=899.53(6) pm and c/a=1.161 for Z=4. The erbium‐oxygen environment appears to be roughly the same as in NdSb2O4Br, so the main difference is the linkage of the ψ1‐[SbO3]3− units. Four of these [SbO3]3− anions assemble in a ring structure {[Sb4O8]4−} by sharing corners. Layers of rings are located in the (001) plane and almost planar bromide‐anion slabs assemble between the antimony‐oxygen layers. In this article, all three crystal structures are compared with each other and single‐crystal Raman spectra were recorded and analyzed for NdSb2O4Br and ErSb2O4Br.
{"title":"LnSb2O4Br (Ln=Nd and Er) and Sb4O5Br2: Lanthanoid‐Bearing and ‐Free Antimony(III) Oxide Bromides","authors":"R. Locke, Maria Weis, Thomas Schleid","doi":"10.1002/zaac.202300243","DOIUrl":"https://doi.org/10.1002/zaac.202300243","url":null,"abstract":"Sb4O5Br2 crystallizes plate‐shaped in the monoclinic space group P21/c with the lattice parameters a=660.82(5) pm, b=513.71(4) pm, c=1346.35(9) pm and β=97.876(3)° for Z=2. Its crystal structure contains \u0000{[Sb4O5]2+} layers with connected [(Sb1)O3+1]5− ψ1‐units and undisturbed pyramidal [(Sb2)O3]3− ψ1‐units, where the free electron pair is counted as a pseudo‐ligand (ψ). The bromide anions required for charge compensation of these cationic \u0000{[Sb4O5]2+} layers form single sheets and are only bonded via van‐der‐Waals interactions in this crystal structure, as the nearest distance to antimony cations is at least 300 pm. NdSb2O4Br crystallizes plate‐shaped in the monoclinic space group P21/c as well, but with the lattice parameters a=896.24(6) pm, b=801.16(5) pm, c=799.27(5) pm and β=92.129(3)° for Z=4. The [NdO8]13− polyhedra are linked to each other via four edges and thus form fluorite‐related layers \u0000{[NdO\u0000]5−}, which run parallel to the (100) plane. The [SbO3]3− anions share vertices to build chains \u0000{[SbO\u0000O\u0000]−} along [001], which align parallel within the (100) plane. The isolated Br− anions arrange in layers and show a minimum distance of 319 pm to the next Sb3+ cation. ErSb2O4Br crystallizes plate‐shaped in the non‐centrosymmetric tetragonal space group P4212 with the lattice parameters a=774.76(4) pm, c=899.53(6) pm and c/a=1.161 for Z=4. The erbium‐oxygen environment appears to be roughly the same as in NdSb2O4Br, so the main difference is the linkage of the ψ1‐[SbO3]3− units. Four of these [SbO3]3− anions assemble in a ring structure \u0000{[Sb4O8]4−} by sharing corners. Layers of rings are located in the (001) plane and almost planar bromide‐anion slabs assemble between the antimony‐oxygen layers. In this article, all three crystal structures are compared with each other and single‐crystal Raman spectra were recorded and analyzed for NdSb2O4Br and ErSb2O4Br.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"51 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141268915","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}
Sebastian Egner, Oluseun Akintola, Winfried Plass, Phil Liebing, Nils Schlörer, Gerald Hörner, Birgit Weber
The combination of planar‐directing, strong‐field [N4] ligands with a weak axial field component is known to stabilize five‐coordinate iron(III) complexes in otherwise uncommon spin states. In this work, a series of axially perturbed iron(III) complexes of an [N4] macrocyclic ligand of the Jäger type, [Fe(L)X] (with X: Cl, Br, I, NCS) gave intermediate‐spin ground states with axially steered admixture of the high‐spin state, S = 3/2; 5/2. The nature of the electronic ground‐state as deduced from SQUID magnetometry, 57Fe Mössbauer spectroscopy in the solid, and 1H NMR and EPR spectroscopies in (frozen) solutions was discussed in the light of the solid‐state structures, which were obtained from single‐crystal X‐ray diffraction. A DFT‐based protocol was established to quantify the axial field effects and, by including relevant [N4] systems, predict the differential equatorial ligand field components.
{"title":"Axial Perturbation of Intermediate Spin (S = 3/2) Iron(III) Complexes with Square Pyramidal N4X Coordination: Solid State Structures and Electronic Properties","authors":"Sebastian Egner, Oluseun Akintola, Winfried Plass, Phil Liebing, Nils Schlörer, Gerald Hörner, Birgit Weber","doi":"10.1002/zaac.202400061","DOIUrl":"https://doi.org/10.1002/zaac.202400061","url":null,"abstract":"The combination of planar‐directing, strong‐field [N4] ligands with a weak axial field component is known to stabilize five‐coordinate iron(III) complexes in otherwise uncommon spin states. In this work, a series of axially perturbed iron(III) complexes of an [N4] macrocyclic ligand of the Jäger type, [Fe(L)X] (with X: Cl, Br, I, NCS) gave intermediate‐spin ground states with axially steered admixture of the high‐spin state, S = 3/2; 5/2. The nature of the electronic ground‐state as deduced from SQUID magnetometry, 57Fe Mössbauer spectroscopy in the solid, and 1H NMR and EPR spectroscopies in (frozen) solutions was discussed in the light of the solid‐state structures, which were obtained from single‐crystal X‐ray diffraction. A DFT‐based protocol was established to quantify the axial field effects and, by including relevant [N4] systems, predict the differential equatorial ligand field components.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"7 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141271054","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}
The unique site substitution of Zn in the structure of tetragonal and atomically ordered Cu6Zn2Sb2, followed by the formation of Cu5Zn3Sb2, has been addressed from fundamental perspectives. First principles energy calculations, and semi‐empirical electronic structure calculations using the density of states, crystal orbital Hamilton population, crystal orbital bond index and Mulliken population analysis were performed to understand the observed substitution pattern and the narrow homogeneity range of the titled compound. Mulliken and Löwdin’s approach of charge analysis explain the experimentally proved ‘coloring’ based on the ‘site energy’ argument. The concept of ‘topological charge stabilization’ has been introduced in this context. Valence electron concentration and the optimization of the partially covalent Cu‐Sb interactions also play pivotal role in the electronic stability of the titled phase.
{"title":"A Fundamental Perspective on the Selective Zn Substitution in Ternary Ordered Intermetallic Compound Cu 6 Zn 2 Sb 2","authors":"Nilanjan Roy","doi":"10.1002/zaac.202400030","DOIUrl":"https://doi.org/10.1002/zaac.202400030","url":null,"abstract":"The unique site substitution of Zn in the structure of tetragonal and atomically ordered Cu6Zn2Sb2, followed by the formation of Cu5Zn3Sb2, has been addressed from fundamental perspectives. First principles energy calculations, and semi‐empirical electronic structure calculations using the density of states, crystal orbital Hamilton population, crystal orbital bond index and Mulliken population analysis were performed to understand the observed substitution pattern and the narrow homogeneity range of the titled compound. Mulliken and Löwdin’s approach of charge analysis explain the experimentally proved ‘coloring’ based on the ‘site energy’ argument. The concept of ‘topological charge stabilization’ has been introduced in this context. Valence electron concentration and the optimization of the partially covalent Cu‐Sb interactions also play pivotal role in the electronic stability of the titled phase.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141273341","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}
The ternary amide Na2Ba(NH2)4 was synthesized at ammonothermal conditions (870 K, 135 MPa) in custom‐built high‐pressure autoclaves. The compound was structurally characterized using X‐ray diffraction and crystallizes in space group Pccn (no. 56) with lattice parameters a = 10.6492(2), b = 7.8064(2) and c = 8.1046(2) Å. To the best of our knowledge, the structure type has not yet been observed in any ternary amide before and can be described as a defective variant of the NaCl structure type. The presence of amide ions in the compound is verified by Fourier‐transform infrared (FTIR) spectroscopy and the experimental spectrum is compared to the theoretical spectrum obtained through density functional theory (DFT) calculations. Na2Ba(NH2)4 complements the range of reported ternary alkali metal alkaline‐earth metal amides with the smallest Shannon radius ratio of rA/AE = 0.76. The influence of this ratio on the formation of the new structure type is discussed as well. The characterization of intermediate species such as this ternary amide extends the understanding of the ammonothermal synthesis and can be useful for synthetic control in the formation of nitrides at ammonothermal conditions.
三元酰胺 Na2Ba(NH2)4 是在氨热条件下（870 K，135 MPa）在定制高压釜中合成的。该化合物采用 X 射线衍射法进行了结构表征，其晶体为空间群 Pccn（编号 56），晶格参数 a = 10.6492(2)、b = 7.8064(2)和 c = 8.1046(2)埃。据我们所知，这种结构类型以前从未在任何三元酰胺中观察到过，可以说是 NaCl 结构类型的缺陷变体。傅立叶变换红外光谱（FTIR）验证了化合物中酰胺离子的存在，并将实验光谱与通过密度泛函理论（DFT）计算得到的理论光谱进行了比较。Na2Ba(NH2)4 以最小的香农半径比 rA/AE = 0.76 补充了已报道的碱金属-土金属三元酰胺的范围。我们还讨论了这一比率对新结构类型形成的影响。对这种三元酰胺等中间产物的表征扩展了对氨热合成的理解，有助于在氨热条件下形成氮化物的合成控制。
{"title":"Ammonothermal Synthesis and Crystal Structure of the Ternary Amide Na2Ba(NH2)4","authors":"F. M. Engelsberger, Kristian Witthaut, W. Schnick","doi":"10.1002/zaac.202400053","DOIUrl":"https://doi.org/10.1002/zaac.202400053","url":null,"abstract":"The ternary amide Na2Ba(NH2)4 was synthesized at ammonothermal conditions (870 K, 135 MPa) in custom‐built high‐pressure autoclaves. The compound was structurally characterized using X‐ray diffraction and crystallizes in space group Pccn (no. 56) with lattice parameters a = 10.6492(2), b = 7.8064(2) and c = 8.1046(2) Å. To the best of our knowledge, the structure type has not yet been observed in any ternary amide before and can be described as a defective variant of the NaCl structure type. The presence of amide ions in the compound is verified by Fourier‐transform infrared (FTIR) spectroscopy and the experimental spectrum is compared to the theoretical spectrum obtained through density functional theory (DFT) calculations. Na2Ba(NH2)4 complements the range of reported ternary alkali metal alkaline‐earth metal amides with the smallest Shannon radius ratio of rA/AE = 0.76. The influence of this ratio on the formation of the new structure type is discussed as well. The characterization of intermediate species such as this ternary amide extends the understanding of the ammonothermal synthesis and can be useful for synthetic control in the formation of nitrides at ammonothermal conditions.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141273955","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}
{"title":"Front Cover: On the Equilibrium of Mono‐ and Dinuclear Cu(II) Dimethylglyoxime Complexes and its Exploitation for the Simple Preparation of Cu(I) Salts [Cu(CH3CN)4]X (X=ClO4−, BF4−, OTf−) (Z. Anorg. Allg. Chem. 9‐10/2024)","authors":"Raphael I. Petrikat, Thomas Frick, Sabine Becker","doi":"10.1002/zaac.202480901","DOIUrl":"https://doi.org/10.1002/zaac.202480901","url":null,"abstract":"","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141194802","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}
This work successfully fabricated a novel CNWs/Ni2Si/SiOC nanocomposite ceramic material using a single‐source‐precursor derived ceramic approach. The material exhibits in‐situ formation of carbon nanowires (CNWs) and multiple core‐shell nanoparticles such as Ni2Si@C and SiC@C. The reaction mechanism of the precursor, the microstructure and phase composition, and the ceramics′ electromagnetic wave (EMW) absorbing properties were thoroughly investigated and discussed. The obtained CNWs/Ni2Si/SiOC nanocomposite ceramics possesses a minimum reflection loss (RLmin) of −43.5 dB, indicating excellent EMW absorbing performance. The in‐situ formation of CNWs and multi‐core‐shell nanoparticles (Ni2Si@C and SiC@C) in the ceramics play a crucial role in enhancing their EMW absorbing properties compared to pure SiOC ceramics.
{"title":"Electromagnetic Wave Absorption Properties of Single‐Source‐Precursor Derived CNWs/Ni2Si/SiOC Nanocomposites","authors":"Ting Chen, Hanzi Du, Ralf Riedel, Zhaoju Yu","doi":"10.1002/zaac.202300236","DOIUrl":"https://doi.org/10.1002/zaac.202300236","url":null,"abstract":"This work successfully fabricated a novel CNWs/Ni<jats:sub>2</jats:sub>Si/SiOC nanocomposite ceramic material using a single‐source‐precursor derived ceramic approach. The material exhibits <jats:italic>in‐situ</jats:italic> formation of carbon nanowires (CNWs) and multiple core‐shell nanoparticles such as Ni<jats:sub>2</jats:sub>Si@C and SiC@C. The reaction mechanism of the precursor, the microstructure and phase composition, and the ceramics′ electromagnetic wave (EMW) absorbing properties were thoroughly investigated and discussed. The obtained CNWs/Ni<jats:sub>2</jats:sub>Si/SiOC nanocomposite ceramics possesses a minimum reflection loss (RLmin) of −43.5 dB, indicating excellent EMW absorbing performance. The <jats:italic>in‐situ</jats:italic> formation of CNWs and multi‐core‐shell nanoparticles (Ni<jats:sub>2</jats:sub>Si@C and SiC@C) in the ceramics play a crucial role in enhancing their EMW absorbing properties compared to pure SiOC ceramics.","PeriodicalId":23934,"journal":{"name":"Zeitschrift für anorganische und allgemeine Chemie","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141189324","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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