{"title":"Cationic Coordination Modification Drives Birefringence and Nonlinear Effect Double Lifting in Sulfate","authors":"Jiahao Wan, Ping Wang, Zhenhua Li, Chunxiang Wu, Weining Zheng, Lehui Liu, Hongming Liu","doi":"10.1021/acs.inorgchem.4c04834","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c04834","url":null,"abstract":"As nonlinear optical (NLO) crystals, sulfates have the superiority of transparency for ultraviolet (UV) light, but they are often troubled by small nonlinear coefficients and birefringence owing to the high symmetry of the [SO<sub>4</sub>]<sup>2–</sup> group. By introducing two neutral diethylenetriamine (DETA) molecules to replace the six coordinated water molecules of the [Zn(H<sub>2</sub>O)<sub>6</sub>]<sup>2+</sup> complex cation in [Zn(H<sub>2</sub>O)<sub>6</sub>](SO<sub>4</sub>)(H<sub>2</sub>O), a new sulfate with an acentric structure, namely, [Zn(DETA)<sub>2</sub>](SO<sub>4</sub>)(H<sub>2</sub>O)<sub>3</sub>, has been designed and synthesized. Structural investigation reveals that the coordination modification of Zn<sup>2+</sup> ion tremendously enhances its intraoctahedral distortion. The formed distorted [Zn(DETA)<sub>2</sub>]<sup>2+</sup> cations and the [SO<sub>4</sub>]<sup>2–</sup> groups feature an optimized arrangement, endowing [Zn(DETA)<sub>2</sub>](SO<sub>4</sub>)(H<sub>2</sub>O)<sub>3</sub> with enhancements in both second harmonic generation (SHG) intensity, from undetectable to 0.25 × KH<sub>2</sub>PO<sub>4</sub> (KDP), and birefringence, from 0.014 to 0.042 at 1064 nm. Despite the slight compromise made in the light transmission range, [Zn(DETA)<sub>2</sub>](SO<sub>4</sub>)(H<sub>2</sub>O)<sub>3</sub> still possesses a short absorption edge of 220 nm, retaining the majority of the light transmission range in the solar-blind region. Our work provides a novel and applicable approach of cationic coordination modification to improve the nonlinear optical coefficient and birefringence of sulfates.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"13 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shashank V. Rao, Dimitrios Maganas, Kantharuban Sivalingam, Mihail Atanasov, Frank Neese
{"title":"Extended Active Space Ab Initio Ligand Field Theory: Applications to Transition-Metal Ions","authors":"Shashank V. Rao, Dimitrios Maganas, Kantharuban Sivalingam, Mihail Atanasov, Frank Neese","doi":"10.1021/acs.inorgchem.4c03893","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c03893","url":null,"abstract":"Ligand field theory (LFT) is one of the cornerstones of coordination chemistry since it provides a conceptual framework in which a great many properties of d- and f-element compounds can be discussed. While LFT serves as a powerful qualitative guide, it is not a tool for quantitative predictions on individual compounds since it incorporates semiempirical parameters that must be fitted to experiment. One way to connect the realms of first-principles electronic structure theory that has emerged as particularly powerful over the past decade is the ab initio ligand field theory (AILFT). The original formulation of this method involved the extraction of LFT parameters by fitting the ligand field Hamiltonian to a complete active space self-consistent field (CASSCF) Hamiltonian. The extraction was shown to be unique provided that the active space consists of 5/7 metal d/f-based molecular orbitals (MOs). Subsequent improvements have involved incorporating dynamical correlation using second-order N-electron valence state perturbation theory (NEVPT2) or second-order dynamical correlation dressed complete active space (DCDCAS). However, the limitation of past approaches is that the method requires a minimal space of 5/7 metal d- or f-based molecular orbitals. This leads to a number of limitations: (1) neglect of radial or semicore correlation would arise from the effect of a second d-shell or an sp-shell in the active space, (2) a more balanced description of metal–ligand bond covalency is lacking because the bonding ligand-based counterparts of the metal d/f orbitals are not in the active space. This usually leads to an exaggerated ionicity of the M–L bonds. In this work, we present an extended active space AILFT (esAILFT) that circumvents these limitations and is, in principle, applicable to arbitrary active spaces, as long as these contain the 5/7 metal d/f-based MOs as a subset. esAILFT was implemented in a development version of the ORCA software package. In order to help with the application of the new method, various criteria for active space extension were explored for 3d, 4d, and 5d transition-metal ions with varying charge. An interpretation of the trends in the Racah B parameter for these ions is also presented as a demonstration of the capabilities of esAILFT.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"54 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sarah Costa, Sarah M. Chui, Katelyn A. Espinoza, James C. Fettinger, Alan L. Balch
{"title":"Bridging 1,2-Bis(diphenylphosphino)methane Ligands Facilitate the Formation of Binuclear Complexes with Both Two-Coordinate and Three-Coordinate Gold(I) Ions","authors":"Sarah Costa, Sarah M. Chui, Katelyn A. Espinoza, James C. Fettinger, Alan L. Balch","doi":"10.1021/acs.inorgchem.4c03657","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c03657","url":null,"abstract":"Five new crystalline gold(I) complexes β-Au<sub>2</sub>(μ-dppm)<sub>2</sub>Br<sub>2</sub>·2CH<sub>2</sub>Cl<sub>2</sub> (<b>1</b>), [Au<sub>2</sub>(μ- dppm)<sub>2</sub>Br]Br·2CH<sub>2</sub>Cl<sub>2</sub> (<b>2</b>), [Au<sub>2</sub>(μ-dppm)<sub>2</sub>Br](PF<sub>6</sub>) (<b>3</b>), [Au<sub>2</sub>(μ-dppm)<sub>2</sub>Cl](BPh<sub>4</sub>)·3CH<sub>2</sub>Cl<sub>2</sub> (<b>4</b>) and [Au<sub>2</sub>(μ-dppm)<sub>2</sub>]Cl(AsF<sub>6</sub>)·2CH<sub>2</sub>Cl<sub>2</sub> (<b>5</b>) (where dppm is bis(diphenylphosphino)methane) have been prepared and structurally characterized by single crystal X-ray diffraction. Colorless β-Au<sub>2</sub>(μ-dppm)<sub>2</sub>Br<sub>2</sub>·2CH<sub>2</sub>Cl<sub>2</sub> (<b>1</b>) has centrosymmetric structure with two three-coordinate gold(I) ions held in close proximity by the dppm ligands. Crystals of [Au<sub>2</sub>(μ- dppm)<sub>2</sub>Br]Br·2CH<sub>2</sub>Cl<sub>2</sub> (<b>2</b>), [Au<sub>2</sub>(μ-dppm)<sub>2</sub>Br](PF<sub>6</sub>) (<b>3</b>), and [Au<sub>2</sub>(μ-dppm)<sub>2</sub>Cl](BPh<sub>4</sub>)·3CH<sub>2</sub>Cl<sub>2</sub> (<b>4</b>) have a cation with an unusual arrangement that binds a two-coordinate gold(I) ion to a three-coordinate gold(I) ion through an aurophilic interaction. Whereas Au<sub>2</sub>(μ-dppm)<sub>2</sub>Cl(BPh<sub>4</sub>)·3CH<sub>2</sub>Cl<sub>2</sub> (<b>4</b>) has a chloride ion bound to only one of the gold ions in the complex, [Au<sub>2</sub>(μ-dppm)<sub>2</sub>]Cl(AsF<sub>6</sub>)·2CH<sub>2</sub>Cl<sub>2</sub> (<b>5</b>) has an ion paired chloride ion that is symmetrically disposed between the two gold ions at a rather long distance. Each complex displays luminescence under UV irradiation.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"115 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Binbin Wang, Ningyan Li, Zhenghua Ju, Weisheng Liu
{"title":"Single-Component Coordination Polymers with Excitation Wavelength- and Temperature-Dependent Long Persistent Luminescence toward Multilevel Information Security","authors":"Binbin Wang, Ningyan Li, Zhenghua Ju, Weisheng Liu","doi":"10.1021/acs.inorgchem.4c04414","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c04414","url":null,"abstract":"Metal–organic hybrid materials with long persistent luminescence (LPL) properties have attracted a lot of attention due to their enormous potential for applications in information encryption, anticounterfeiting, and other correlation fields. However, achieving multimodal luminescence in a single component remains a significant challenge. Herein, we report two two-dimensional LPL coordination polymers: {[Zn<sub>2</sub>(BA)<sub>2</sub>(BIMB)<sub>2</sub>]·2H<sub>2</sub>O}<sub><i>n</i></sub> (<b>1</b>) and {[Cd(BA)(BIMB)]·3H<sub>2</sub>O}<sub><i>n</i></sub> (<b>2</b>) (BIMB = 1,3-bis(imidazol-1-yl)benzene; BA = butanedioic acid). Their LPL colors can be adjusted by the excitation wavelength or temperature variation in a single-component coordination polymer, achieving multimode color adjustment from green to orange or blue to yellow. X-ray single-crystal diffraction analysis and theoretical calculations demonstrate that abundant intermolecular interactions, ligand-to-ligand charge transfer (LLCT) transitions, and heavy atom effects of the central metal can realize multicolor afterglow. This work provides a convenient strategy for new pattern multicolor LPL materials and may also inspire new ideas for advanced information encryption technologies.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"22 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Li Ping Ding, Zi Ao Guo, Fei yue Qiao, Shao Fei Lei, Hong Yuan Xu, Guo-Dong Wei, Peng Shao
{"title":"Effect of Edge Reconstruction on the Growth Mechanism of Black Phosphorene","authors":"Li Ping Ding, Zi Ao Guo, Fei yue Qiao, Shao Fei Lei, Hong Yuan Xu, Guo-Dong Wei, Peng Shao","doi":"10.1021/acs.inorgchem.4c03796","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c03796","url":null,"abstract":"Based on our previous studies, the reconstruction of interlayer edges of black phosphorene (BP) is identified as a key factor impeding the growth of large-size BP films through the CVD method. In this study, we systematically explore the complex growth mechanisms of BP, specifically focusing on how edge reconstruction influences the growth of BP. The results reveal that BP with reconstructed edges is highly stable. Growth necessitates initially opening a unit at the reconstructed edge, requiring a higher energy barrier than that of pristine BP without reconstructed edges. Despite this challenge, overcoming it facilitates subsequent phosphorus atom additions, thereby promoting favorable growth conditions for reconstructed-edge BP. Overall, our research highlights the interplay between edge reconstruction and BP growth dynamics, offering insights for the rational design and synthesis of large-area, high-quality monolayer BP, thus advancing its potential in electronic and optoelectronic applications.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"24 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ru Metalloligands Participate in the Construction of POM@MOF for Enhancing the Visible Photoinduced Baeyer–Villiger Oxidation Reaction","authors":"Luoning Li, Yanan Liu, Jing Wang, Minzhen Cai, Sen Liu, Pengtao Ma, Jingping Wang, Jingyang Niu","doi":"10.1021/acs.inorgchem.4c03064","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c03064","url":null,"abstract":"Directed synthesis of high-efficiency visible photoinduced Baeyer–Villiger oxidation catalysts is of primary significance. Here, the isopolymolybdate anion [β-Mo<sub>8</sub>O<sub>26</sub>]<sup>4–</sup> is for the first time encapsulated with the photosensitive metalloligand [Ru(bpy)<sub>2</sub>(H<sub>2</sub>dcbpy)]<sup>2+</sup> (bpy = 2,2′-bipyridine; H<sub>2</sub>dcbpy = 2,2′-bipyridine-5,5′-dicarboxylic acid) to synthesize polyoxometalate@metal–organic frameworks, {(CdDMF)<sub>2</sub>[Ru(bpy)<sub>2</sub>(dcbpy)]<sub>3</sub>([β-Mo<sub>8</sub>O<sub>26</sub>])}·5DMF (Ru–Mo<sub>8</sub>). The composite photocatalyst Ru–Mo<sub>8</sub> not only has a light absorption of 700 nm but also shortens the photogenerated electron transfer distances and accelerates charge and proton transfer. Ru–Mo<sub>8</sub> can perform the Baeyer–Villiger oxidation with high selectivity and up to 96.7% yield under visible light (λ > 400 nm) irradiation. The turnover number and turnover frequency of the reaction were computed to be 967 and 548 h<sup>–1</sup>, respectively, and the apparent quantum yield was 6.84% by 425 nm. Simultaneously, the radical mechanism of Baeyer–Villiger oxidation of Ru–Mo<sub>8</sub> in the O<sub>2</sub>/benzaldehyde system under visible light (λ > 400 nm) irradiation was proposed.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"10 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Li3[AlP2O7F(OH)](H2O)0.5 and A[Al2(PO4)2F(H2O)](A = K, Rb): Counter Cation Templates Derived Three Polar Alkaline Metal Fluoroaluminophosphates","authors":"Yucheng Hao, Changlin Chen, Cheng Hou, Shaokai Liu, Zheng Peng, Yuan Lin, Haijian Li, Xi Zhao, Kisan Koirala, Hongdian Lu, Chonghai Deng, Kunhong Hu","doi":"10.1021/acs.inorgchem.4c04417","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c04417","url":null,"abstract":"Three novel alkali metal fluoroaluminophosphates, Li<sub>3</sub>[AlP<sub>2</sub>O<sub>7</sub>F(OH)](H<sub>2</sub>O)<sub>0.5</sub> and <i>A</i>[Al<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F(H<sub>2</sub>O)](<i>A</i> = K, Rb), were designed and synthesized by using low-temperature flux methods. They crystallized in polar space groups <i>P</i><sub>4</sub> and <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub>, respectively. Li<sub>3</sub>[AlP<sub>2</sub>O<sub>7</sub>F(OH)](H<sub>2</sub>O)<sub>0.5</sub> features a unique two-dimensional layered structure of fluoroaluminophosphate [AlP<sub>2</sub>O<sub>7</sub>F(OH)]<sup>3–</sup><sub><i>n</i></sub>, composed of alternately connected AlFO<sub>5</sub> octahedra and PO<sub>4</sub> tetrahedra. In contrast, with counter cations from Li<sup>+</sup> to K<sup>+</sup>/Rb<sup>+</sup>, two new crystals of <i>A</i>[Al<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F(H<sub>2</sub>O)](<i>A</i> = K, Rb) have been obtained. They possess a distinct three-dimensional anionic framework, [Al<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F]<sup>−</sup><sub><i>n</i></sub>, consisting of corner-sharing AlO<sub>5</sub> triangular bipyramids, AlFO<sub>5</sub> octahedra, and PO<sub>4</sub> tetrahedra, revealing intersecting open tunnels along the [010], [001], and [111] directions. Notably, both Li<sub>3</sub>[AlP<sub>2</sub>O<sub>7</sub>F(OH)](H<sub>2</sub>O)<sub>0.5</sub> and K[Al<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F(H<sub>2</sub>O)] exhibit moderate second harmonic generation effects. Besides, porous material of K[Al<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F(H<sub>2</sub>O)] exhibited remarkable ionic exchange properties with Cs<sup>+</sup>, implying its potential utility in the remediation of radioactive waste and offering a promising solution for managing nuclear contaminants. This research reports on their syntheses, topological structures, elemental analysis, thermal stability, IR Raman spectroscopy, UV–Vis diffuse reflectance spectroscopy, ion exchange property, and nonlinear optical characteristics.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"5 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ting Zhou, Zhongkai Xie, Hongyun Luo, Hongjing Chen, Longhua Li, Min Chen, Weidong Shi
{"title":"Collective Effect in Hierarchical Porous MOFs Combining Single Atoms and Nanoparticles for Enhanced CO2 Photoreduction to CO","authors":"Ting Zhou, Zhongkai Xie, Hongyun Luo, Hongjing Chen, Longhua Li, Min Chen, Weidong Shi","doi":"10.1021/acs.inorgchem.4c04078","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c04078","url":null,"abstract":"Reasonable construction of atomically accurate photocatalysts is the key to building efficient photocatalytic systems. Herein, we propose a collective effects strategy that enables the consolidation of both cobalt single atoms (Co<sub>SAs</sub>) and nickel nanoparticles (Ni<sub>NPs</sub>) in hierarchical porous MOFs for the foundational features for the preparation of high-performance photocatalysts. Among them, the optimal sample Co<sub>SAs</sub>/Al-bpydc/Ni<sub>NPs</sub> achieved a CO generation rate of 12.8 mmol·g<sup>–1</sup>·h<sup>–1</sup> and selectivity of 91% in 4 h. According to the experiment characterizations and theoretical simulations, we found that Co<sub>SAs</sub> facilitate CO<sub>2</sub> adsorption and activation, while Ni<sub>NPs</sub> promote hydrogen spillover and transfer of hydrogen protons to Co<sub>SAs</sub>, highlighting the collective effect of the catalytic system with multiple active sites. Most importantly, as a proof of concept, this performance enhancement strategy can also be applied to other hierarchically porous MOF photocatalysts, such as Al-bpdc, DUT-4, and UiO-67. This work provides new insight into the development of performance optimization of CO<sub>2</sub> conversion photocatalysts through the ingenious design of collective catalytic sites.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"47 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Teresa Azcondo, Gloria Anemone, Alvaro Muñóz-Noval, Khalid Boulahya, Juan Rubio-Zuazo, Paula Rosendo, Ulises Amador
{"title":"Unveiling the Mechanism of Exsolution of Silver Nanoparticles for Decorating Lanthanum Strontium Ferrite","authors":"M. Teresa Azcondo, Gloria Anemone, Alvaro Muñóz-Noval, Khalid Boulahya, Juan Rubio-Zuazo, Paula Rosendo, Ulises Amador","doi":"10.1021/acs.inorgchem.4c04413","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c04413","url":null,"abstract":"Lanthanum strontium ferrite (La<sub>0.85–<i>x</i></sub>Sr<sub>0.15</sub>Ag<sub><i>x</i></sub>FeO<sub>3−δ</sub> <i>x</i> = 0; LSFO) and its silver-doped derivative (La<sub>0.85–<i>x</i></sub>Sr<sub>0.15</sub>Ag<sub><i>x</i></sub>FeO<sub>3−δ</sub> <i>x</i> = 0.05; LASFO) are synthesized using mild conditions by a sol–gel method. Both oxides present a perovskite-like structure with orthorhombic symmetry due to octahedral tilting; thus, the incorporation of silver in the A-site does not significantly modify the perovskite structure. Exsolution of silver nanoparticles (AgNPs) from LASFO is induced under mild conditions, resulting in Ag@LSFO samples. X-ray absorption spectroscopy and synchrotron X-ray diffraction data reveal that the mechanism of exsolution involves the reduction of Ag<sup>+</sup> and the concomitant release of oxygen, without altering the oxidation state of Fe, inducing the formation of oxygen vacancies in the perovskite matrix. Homogeneous distribution of AgNPs on the perovskite matrix is observed by high-resolution transmission electron microscopy. The thermal evolution of Ag@LSFO proceeds through the progressive increase in oxygen vacancies that become thermally disordered. The study clarifies the mechanism of silver exsolution and the structural changes in lanthanum–strontium ferrite perovskites, providing insights into their potential use in catalytic and energy-related applications.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"39 7 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142841496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Entropy Manipulation of SrTiO3 Perovskite for Enhanced Thermoelectric and Mechanical Properties","authors":"Hongxin Wang, Shanshan Xu, Tong’an Bu, Xinlei Wang, Panpan Lyu, Luchao Ren, Cuncheng Li, Mingwei Zhang, Wenyu Zhao","doi":"10.1021/acs.inorgchem.4c03968","DOIUrl":"https://doi.org/10.1021/acs.inorgchem.4c03968","url":null,"abstract":"Reducing the thermal conductivity while maintaining excellent electrical transport properties is crucial for enhancing the thermoelectric performance of SrTiO<sub>3</sub>-based perovskites. Here, we successfully achieved this goal through precisely manipulating the configurational entropy. A series of Ca<sub>0.25</sub>Nd<sub>0.25</sub>Sr<sub>0.5–<i>x</i></sub> Ba<sub><i>x</i></sub>TiO<sub>3</sub> (<i>x</i> = 0, 0.05, 0.15, 0.25) ceramics were successfully synthesized using the solid-state reaction combined with graphite burial sintering. It was discovered that structural defects from competing elements in the A-site not only slowed diffusion and hindered grain growth but also increased oxygen vacancies by creating additional gas transmission channels. The gradual decrease in carrier mobility with increasing entropy resulted in the degradation of electrical conductivity, while the Seebeck coefficient experienced a large enhancement due to band modification and increased carrier scattering. Meanwhile, multiscale defects, including point defects, local strain fields, dislocations, and grain boundaries, effectively scatter phonons, leading to a low lattice thermal conductivity of 1.73 W·m<sup>–1</sup>·K<sup>–1</sup>. Consequently, the sample with <i>x</i> = 0.15 exhibited a peak <i>ZT</i> of 0.15 at 900 K, reflecting a 148% enhancement compared to that of the matrix. In addition, the hardness increases with configurational entropy because of the chemical disorder, grain refinement, and increased defect concentration. The work emphasizes the importance of precise manipulation of configurational entropy, offering valuable insights for optimizing thermoelectric materials through entropy engineering strategy.","PeriodicalId":40,"journal":{"name":"Inorganic Chemistry","volume":"6 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}