Dalton Transactions最新文献

{"title":"Emission enhancement in a luminescent polychlorinated diphenylpyridylmethyl radical through coordination to silver(I)","authors":"Takuto Mibu, Ryota Matsuoka, Masanari Nagasaka, Tetsuro Kusamoto","doi":"10.1039/d4dt03129f","DOIUrl":"https://doi.org/10.1039/d4dt03129f","url":null,"abstract":"A luminescent silver(<small>I</small>) complex containing a luminescent radical ligand was prepared for the first time. Coordination to Ag<small>^I</small> enhanced and red-shifted the radical-centered emission. This study demonstrates similar effects in the luminescence of the radical by complexation with group 11 d<small>¹⁰</small>-metal ions.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"38 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sr3Zr2Cu4Q9 (Q = S and Se): two novel layered quaternary mixed transition metal chalcogenides","authors":"Sayani Barman, Sweta Yadav, Akshay K. Ray, Swati, M. Deepa, Manish K. Niranjan, Jai Prakash","doi":"10.1039/d4dt02928c","DOIUrl":"https://doi.org/10.1039/d4dt02928c","url":null,"abstract":"Depending on their bandgaps, mixed metal layered chalcogenides are potential candidates for thermoelectric and photovoltaic applications. Herein, we reported the exploratory synthesis of Sr–Zr–Cu–&lt;em&gt;Q&lt;/em&gt; (&lt;em&gt;Q&lt;/em&gt; = S/Se) systems, resulting in the identification of two novel quaternary chalcogenides: Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;S&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt; and Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;Se&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt;. These isoelectronic compounds (Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;&lt;em&gt;Q&lt;/em&gt;&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt;) crystallized in two different structural types. The Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;S&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt; structure (space group: &lt;em&gt;P&lt;/em&gt;&lt;img alt=\"[1 with combining macron]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_0031_0304.gif\"/&gt;) adopted the Ba&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;S&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt; structure type with eighteen unique atomic sites: 3 × Sr, 2 × Zr, 4 × Cu, and 9 × S. In contrast, the Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;Se&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt; structure (&lt;em&gt;P&lt;/em&gt;&lt;img alt=\"[1 with combining macron]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_0031_0304.gif\"/&gt;) represented a unique structure type with nineteen unique atomic positions including one additional Cu site compared to the Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;S&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt; structure. The sulfide structure was stoichiometric, whereas the selenide structure was found to be non-stoichiometric with three partially occupied Cu positions. The Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;&lt;em&gt;Q&lt;/em&gt;&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt; structures consisted of &lt;img align=\"middle\" alt=\"Image ID:d4dt02928c-t1.gif\" src=\"https://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/Articleimage/2025/DT/D4DT02928C/d4dt02928c-t1.gif\"/&gt; layers with the Sr&lt;small&gt;&lt;sup&gt;2+&lt;/sup&gt;&lt;/small&gt; cations occupying the interstitial spaces. In both structures, the Zr atoms occupied distorted octahedral positions. A striking difference between the two structures resulted from the distinct bonding interactions between the Cu and &lt;em&gt;Q&lt;/em&gt; atoms. The optical bandgap of polycrystalline Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;S&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt; was 1.7(1) eV. Interestingly, resistivity measurements of polycrystalline Sr&lt;small&gt;&lt;sub&gt;3&lt;/sub&gt;&lt;/small&gt;Zr&lt;small&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;/small&gt;Cu&lt;small&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;/small&gt;Se&lt;small&gt;&lt;sub&gt;9&lt;/sub&gt;&lt;/small&gt; revealed metallic/degenerate semiconducting behavior at low temperatures. The photovoltai","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"3 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bisquinoline-based fluorescent cadmium sensors","authors":"Yuji Mikata","doi":"10.1039/d4dt02788d","DOIUrl":"https://doi.org/10.1039/d4dt02788d","url":null,"abstract":"Rational molecular design afforded fluorescent Cd2+ sensors based on bisquinoline derivatives. Introduction of three methoxy groups at the 5,6,7-position of quinoline rings of BQDMEN (N,N’-bis(2-quinolylmethyl)-N,N’-dimethylethylenediamine) resulted in the reversal of metal ion selectivity in fluorescence enhancement from zinc to cadmium. Introduction of bulky alkyl groups and N,N-bis(2-quinolylmethyl)amine structure, as well as replacement of one of the two tertiary amine binding sites with an oxygen atom and the use of 1,2-phenylene backbone, significantly improved the Cd2+ specificity. The fluorescent cadmium ion selectivity could be explained by the differential binding with Cd2+ and Zn2+, and the formation of bis(µ-chloro) dinuclear cadmium complex in contrast to the mononuclear zinc complex.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"11 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermoelectric and electrical properties of triple-conducting multicomponent oxides based on substituted barium cerate-zirconate","authors":"M. M. Czudec, D. Jaworski, J. Budnik, A. Mielewczyk-Gryń, T. Subramani, M. Gazda, A. Navrotsky, T. Miruszewski","doi":"10.1039/d4dt01992j","DOIUrl":"https://doi.org/10.1039/d4dt01992j","url":null,"abstract":"Multicomponent oxides often have exceptional thermal stability and interesting electronic properties. The present work presents the thermoelectric and electrical properties of the Ba(Zr<small>_0.2</small>Hf<small>_0.2</small>Sn<small>_0.2</small>Ti<small>_0.2</small>Fe<small>_0.2</small>)O<small>_{3−<em>δ</em>}</small> and Ba(Zr<small>_0.1</small>Hf<small>_0.1</small>Sn<small>_0.1</small>Ti<small>_0.1</small>Co<small>_0.1</small>Ce<small>_0.1</small>Bi<small>_0.1</small>Fe<small>_0.1</small>Y<small>_0.1</small>Zn<small>_0.1</small>)O<small>_{3−<em>δ</em>}</small> multicomponent perovskites. Single-phase cubic perovskites were synthesized using the solid-state reaction method. They were characterized using X-ray diffraction, drop-solution calorimetry, and thermogravimetry methods. The total electrical conductivity and Seebeck coefficient measurements were performed in dry and wet air at temperatures between 600 and 1050 K. It was found that Ba(Zr<small>_0.1</small>Hf<small>_0.1</small>Sn<small>_0.1</small>Ti<small>_0.1</small>Co<small>_0.1</small>Ce<small>_0.1</small>Bi<small>_0.1</small>Fe<small>_0.1</small>Y<small>_0.1</small>Zn<small>_0.1</small>)O<small>_{3−<em>δ</em>}</small> is thermodynamically less stable than Ba(Zr<small>_0.2</small>Hf<small>_0.2</small>Sn<small>_0.2</small>Ti<small>_0.2</small>Fe<small>_0.2</small>)O<small>_{3−<em>δ</em>}</small>. Moreover, this oxide incorporates a higher amount of water and exhibits higher conductivity and lower Seebeck coefficient. Charge transport in both perovskites can be assigned to the small-polaron hopping process <em>via</em> electron holes. An interesting temperature dependence of the Seebeck coefficient was found and, at temperatures above 750 K, related to hopping between energetically inequivalent states.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"3 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eu2Pt3Pb5 and SrPt2Pb4 — lead-based intermetallics with Y2Rh3Sn5 / NdRh2Sn4-type polyanionic platinum-lead 3D frameworks","authors":"Anastasiya Yu Makhaneva, Elena Yu Zakharova, Sergey N Nesterenko, Sergey M. Kazakov, Konstantin Lyssenko, Alexey Bogach, Andrey Azarevich, Alexey N. Kuznetsov","doi":"10.1039/d4dt03293d","DOIUrl":"https://doi.org/10.1039/d4dt03293d","url":null,"abstract":"Two platinide plumbides, Eu2Pt3Pb5 and SrPt2Pb4, were discovered using high-temperature exploratory synthesis and flux-assisted crystal growth. Their crystal structures were determined from single-crystal X-ray diffraction. Both compounds crystallize in the orthorhombic system, Eu2Pt3Pb5 belongs to the Y2Rh3Sn5 structure type (Cmc21, a=4.6146(2) Å, b=27.3082(12) Å, c=7.5147(3) Å, Z=4, R1=0.0310, wR2=0.0736) and SrPt2Pb4 to the NdRh2Sn4 type (Pnma, a=19.411(5) Å, b=4.5834(13) Å, c=7.6548(19) Å, Z=4, R1=0.0399, wR2=0.0906). Both compounds feature complex frameworks of the Pt-Pb and Pb-Pb bonds with very similar motifs, with Eu or Sr cations filling the cavities, which differ by the presence of the TiNiSi-type EuPtPb layer in Eu2Pt3Pb5. According to the DFT calculations, both compounds are metallic and feature Sr and Eu divalent cations along with negatively charged mostly covalent framework of Pt and Pb atoms. Magnetic measurements show that SrPt2Pb4 compound is non-magnetic, while Eu2Pt3Pb5 is a paramagnet above ca. 85 K and below that temperature transitions to the ferromagnetically ordered state with very low coercitivity.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"12 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Cu(NHC)(OR)] (R = C(CF3)3) complexes for N-H and S-H bond activation and as pre-catalysts in the Chan-Evans-Lam reaction","authors":"Steven P Nolan, Tommaso Ruggiero, Kristof Van Hecke, Catherine Cazin","doi":"10.1039/d4dt03322a","DOIUrl":"https://doi.org/10.1039/d4dt03322a","url":null,"abstract":"The synthesis, isolation, and full characterization of a series of NHC-copper perfluoro-alkoxide complexes are reported. Their exceptional stability resides with the steric hindrance of the nonafluoro-tert-butyl alkoxide moiety, which exhibits a strong electron withdrawing effect. These new Cu(I) complexes are synthons that can permit the activation of acidic N–H and S–H bonds. The well-defined [Cu(IPr)(OC(CF3)3)] was investigated as a pre-catalyst in the Chan-Evans-Lam reaction.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"76 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142831948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cu(II)-Mediated Tautomerization for the Pyrazole-Nitrile Coupling Reaction","authors":"Chang-Chih Hsieh, Chia-Wei Chen, Ming-Hsi Chiang, Yih-Chern Horng","doi":"10.1039/d4dt02904f","DOIUrl":"https://doi.org/10.1039/d4dt02904f","url":null,"abstract":"This study investigates the mechanism of prototropic tautomerization in metal-bound asymmetric pyrazole (R-PzH) ligands during Cu(II)-mediated PzH-MeCN coupling reactions. Intrinsic prototropic tautomerization of metal-bound ligands has not been previously documented. Various new bis-pyrazolylamidino Cu(II) complexes, [Cu(R-Pz(HN=C(Me))2(ClO4)2], from the coupling reaction, and tetrakis(PzH) Cu(II) complexes, [Cu(R-PzH)4(ClO4)2], with symmetric and asymmetric C-monosubstituted R-PzH ligands were synthesized and characterized. Kinetic UV-vis studies revealed slower coupling rates with asymmetric R-PzH ligands, further reduced with increasing substituent size due to steric hindrance impeding tautomerization. Structural analysis showed preferential binding of asymmetric 3(5)-R-PzH to Cu(II) ions at the C5 position of PzH, requiring a tautomeric shift to the C3 position for the subsequent coupling reaction. DFT calculations confirmed the greater stability of the C5-tautomeric [Cu(R-PzH)4(ClO4)2] complexes over their C3 counterparts, explaining the rate discrepancies. A mechanism involving counteranion-mediated proton transfer during tautomerization is proposed to account for coupling product formation.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"47 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extended chains in Vanadium O-centered complex [V4OSe8I5]∞: synthesis and structure","authors":"Ruslan Galiev, Sofya Borisovna Artemkina, Vladislav Komarov, Maxim R. Ryzhikov, Svetlana Kozlova, Vitalii Anatolievich Kuznetsov, Ekaterina D. Grayfer, Vladimir E. Fedorov","doi":"10.1039/d4dt02758b","DOIUrl":"https://doi.org/10.1039/d4dt02758b","url":null,"abstract":"O-centered tetranuclear vanadium selenoiodide [V4OSe8I5]∞ (1) was synthesized by an ampoule method from the elements with addition of water. Its X-ray crystal structure (space group C2/c, a = 21.146(2) Å, b = 5.8953(5) Å, c = 18.735(1) Å, β = 126.421(2)°, V = 1879.4(3) Å3, T = 150 К, Z = 4) is a packing of chains built from O-centered tetranuclear [V4(μ4-O)(μ-Se2)4(μ4-I)2/2I4] fragments. In the O-centered fragment, vanadium atoms form a distorted tetrahedron around an oxygen atom, V atoms are bridged by four μ2-(Se2)2– and two I– ligands. The latter iodide ligands bridge the neighboring fragments, thus forming a chain [V4(μ4-O)(μ-Se2)4(μ4-I)2/2I4]∞. The synthesis of the chain [V4OSe8I5]∞ takes place at the temperature of 290°С, while at lower temperatures (220-250°С) molecular compounds [V4OSe8I6]·X form. The direct ‘cluster to chain’ transformation is also observed and discussed in this work. Electrical resistance of the [V4OSe8I5]∞ polycrystalline pressed sample shows that the compound 1 is a narrow gap semiconductor, which is in agreement with the DFT calculations.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"242 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One-Step Spray Pyrolysis Synthesis of ZnO/Ag Hollow Spheres for Enhanced Visible-Light-Driven Antibacterial Applications and Wound Healing","authors":"Hailong Miao, Haili Wang, Xiaoyue Feng, Hongwei Jiao","doi":"10.1039/d4dt02581d","DOIUrl":"https://doi.org/10.1039/d4dt02581d","url":null,"abstract":"ZnO/Ag hollow particles were synthesized via a one-step spray pyrolysis method for enhanced antibacterial activity and wound healing applications. The hollow structure and uniform distribution of Ag nanoparticles within the ZnO matrix were confirmed by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). UV-Vis spectroscopy and Tauc plot analysis revealed a reduction in the bandgap, attributed to the surface plasmon resonance (SPR) of Ag, improving light absorption in the visible range. Antibacterial tests against Escherichia coli (E. coli) and methicillin-resistant Staphylococcus aureus (MRSA) showed that ZnO/Ag composites exhibited significantly enhanced antibacterial efficacy under visible light compared to pure ZnO. The antibacterial mechanism was investigated using electron paramagnetic resonance (EPR) spectroscopy, which confirmed the generation of reactive oxygen species (˙OH and ˙O₂⁻). These results indicate that ZnO/Ag hollow composites are promising candidates for antibacterial coatings and wound healing applications, especially under visible light activation.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"32 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"X and Q-band EMR study of ultrasmall Zn1-xMnxFe2O4 spinel nanoparticles fabricated under nonhydrolytic conditions","authors":"Iwona Rogalska, Bogumił Cieniek, Anna Tomaszewska, Magdalena Kulpa-Greszta, Piotr Krzemiński, Bartosz Zarychta, Ireneusz Stefaniuk, Robert Pazik","doi":"10.1039/d4dt02647k","DOIUrl":"https://doi.org/10.1039/d4dt02647k","url":null,"abstract":"In this work, we are showing the results of the X- and Q-band electron magnetic resonance measurements of ultra-small Zn1-xMnxFe2O4 nanoparticles (c.a. 8 nm) with a very narrow size distribution. The chosen synthetic route allows for precise structural modifications with a very broad concentration range (x – 0, 0.2, 0.5, 0.8, 1). The crystal structure was evaluated by means of the X-ray diffraction technique, while cell parameters were calculated using Rietveld refinement. EMR spectral studies indicated that the prepared nanoparticles were superparamagnetic. The linewidth of EMR signal for any ferrite material generally originates from two sources: (a) magnetic dipole-dipole interactions among particles and (b) interparticle superexchange interactions between magnetic ions through oxygen ions. Observed effects are more complex interactions than in pure zinc and manganese ferrites. As a result of the study, a relationship was observed between the composition of the material and the magnetic properties with striking antiferromagnetism and ferrimagnetism change. Hence, by structural modification of materials, the magnetic character (FM-AFM-FiM) can be controlled.","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":"11 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142832078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}