PolyhedronPub Date : 2025-02-01DOI: 10.1016/j.poly.2024.117360
Wei Chen , Xiangyang Li , Wei Yao , Vladimir P. Fedin , Enjun Gao
{"title":"Fluorescence and electrochemical detection of pollutants utilizing a Keggin-type Zn(II)-polyoxometalate","authors":"Wei Chen , Xiangyang Li , Wei Yao , Vladimir P. Fedin , Enjun Gao","doi":"10.1016/j.poly.2024.117360","DOIUrl":"10.1016/j.poly.2024.117360","url":null,"abstract":"<div><div>The escalating development of the national industry has led to a growing apprehension regarding water pollution. Therefore, there is an urgent need to develop a rapid, convenient, and highly sensitive method for detecting water pollutants. In this study, we successfully prepared a novel Keggin-type polyacid hybrid material with zero-dimensional structure [Zn<sub>2</sub>(C<sub>10</sub>H<sub>6</sub>NO<sub>2</sub>)<sub>2</sub>(C<sub>10</sub>H<sub>7</sub>NO<sub>2</sub>)<sub>4</sub>][ZnCl(C<sub>10</sub>H<sub>7</sub>NO<sub>2</sub>)<sub>3</sub>]<sub>2</sub>[HPMo<sub>12</sub>O<sub>40</sub>]<sub>2</sub> (<strong>1</strong>) through steam heating using 2,3-quinoline dicarboxylic acid, phosphomolybdic acid and Zn(NO<sub>3</sub>)<sub>2</sub> along as precursors. However, it was observed that 2,3-quinoline dicarboxylic acid (H<sub>2</sub>L = C<sub>11</sub>H<sub>7</sub>NO<sub>4</sub>) loses a carboxyl group from a new quinoline-3-carboxylic acid ligand (HL1 = C<sub>10</sub>H<sub>7</sub>NO<sub>2</sub>) during the synthesis process of <strong>1</strong>. Our investigations have revealed two distinct forms for Zn<sup>2+</sup>, form A involves coordination with one Zn ion, three ligands and one chloride ion while form B forms a binuclear cluster [Zn<sub>2</sub>(C<sub>10</sub>H<sub>6</sub>NO<sub>2</sub>)<sub>2</sub>(C<sub>10</sub>H<sub>7</sub>NO<sub>2</sub>)<sub>4</sub>]<sup>2+</sup> by coordinating with two L1<sup>−1</sup> and four HL1 ligands. These structures are further extended into 3D supramolecular architectures via π-π packing between one-dimensional chains formed by connecting the Keggin-type polyoxometalates through multiple hydrogen bonds. Additionally, we explore the fluorescence and electrochemical properties of compound <strong>1</strong>. These results demonstrate its exceptional selectivity and high sensitivity towards Fe<sup>3+</sup>, HPO<sub>4</sub><sup>2−</sup> and CrO<sub>4</sub><sup>2−</sup> as a fluorescence probe and excellent electrochemical activity towards NaNO<sub>2</sub>. Furthermore, the reaction mechanism was thoroughly examined.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"267 ","pages":"Article 117360"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150195","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}
PolyhedronPub Date : 2025-02-01DOI: 10.1016/j.poly.2024.117310
Mathias T. Nielsen , Dmytro Mihrin , Mike S.B. Jørgensen , Xiaomei Yan , Rolf W. Berg , Xinxin Xiao , René Wugt Larsen , Martin Nielsen
{"title":"The paddlewheel complex of 1,8-naphthyridine and palladium(II)","authors":"Mathias T. Nielsen , Dmytro Mihrin , Mike S.B. Jørgensen , Xiaomei Yan , Rolf W. Berg , Xinxin Xiao , René Wugt Larsen , Martin Nielsen","doi":"10.1016/j.poly.2024.117310","DOIUrl":"10.1016/j.poly.2024.117310","url":null,"abstract":"<div><div>This work presents the synthesis of the tetracationic paddlewheel complex of 1,8-naphthyridine and palladium(II), [Pd<sub>2</sub>(µ-napy)<sub>4</sub>]X<sub>4</sub>, (X = BF<sub>4</sub><sup>−</sup> or PF<sub>6</sub><sup>−</sup>). Single-crystal X-ray diffraction confirms a D<sub>4h</sub> symmetric paddlewheel structure encompassing the two Pd units in the metal core coordinated by four ditopic 1,8-naphthyridine ligands, featuring a relatively short Pd–Pd distance. Spectroscopic analyses combined with density-functional theory (DFT) provide insights into the nature of the Pd–Pd and Pd–Napy interactions as well as observed optical absorption frequencies.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"267 ","pages":"Article 117310"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
PolyhedronPub Date : 2025-02-01DOI: 10.1016/j.poly.2024.117358
Rachid Fakhreddine , My Rachid Tigha , Ali Ouasri , Abderrahim Aatiq
{"title":"Structural, morphological, Infrared-Raman, and UV studies of three yavapaiite phosphates Ba(SbV0.5MIII0.5)(PO4)2 (M: Sc, In, Yb)","authors":"Rachid Fakhreddine , My Rachid Tigha , Ali Ouasri , Abderrahim Aatiq","doi":"10.1016/j.poly.2024.117358","DOIUrl":"10.1016/j.poly.2024.117358","url":null,"abstract":"<div><div>Three novel phosphates Ba(Sb<sub>0.5</sub>M<sup>III</sup><sub>0.5</sub>)(PO<sub>4</sub>)<sub>2</sub> (M<sup>III</sup>:<!--> <!-->Sc, In, Yb), denoted [BaSbM], were synthesized by solid-state reactions method. X-ray powder diffraction data refined by the Rietveld method showed that these compounds crystallize at room temperature in isotopic yavapaiite structures of <em>C</em>2/<em>m</em> (Z = 2) space group, consisting of three polyhedra types, BaO<sub>10</sub>, tetrahedral anions PO<sub>4</sub><sup>3−</sup> and Sb(M)O<sub>6</sub>. The two last groups are corner-sharing and alternating along c-axis with Ba cations layers, in ten-fold coordination (6 + 4) with six short [2 × Ba–O(1), 4 × Ba–O(3)] and four long [Ba–O(1)] lengths. The relationships between compositions and [BaSbM] parameters showed linear increasing of (b, c), due to progressive increasing of <Ba–O> and <Sb(M)–O> distances with M<sup>3+</sup> radii. The unit’s volume variation related to b/c parametres is slightly influenced by β angle distortion held between [BaSbIn] and [BaSbYb] phases. Surfaces morphology and chemical compositions of [BaSbSc] and [BaSbIn] are studied by SEM-EDX techniques. SEM-EDX mapping images highlited dispersion homogeneity and composition elements importance for [BaSbSc] phase. The BFDH crystal morphology predicted for [BaSbSc] gives hight facets (h k l) with their center-to-plane distance d<sub>hkl</sub> and morphological importance (MI). The Raman-Infrared study is developped to obtain more information on bond’s nature in phases [BaSbSc] and [BaSbIn] regarding other yavapaiite materials. The bands assignment is made based on vibrational modes analysis considering C<sub>s</sub> site symmetry of PO<sub>4</sub><sup>3−</sup> groups. The UV–visible direct and indirect optical gap energies varying in 3.15–3.55 eV, suggesting thee three phases as semi-conducting materials.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"267 ","pages":"Article 117358"},"PeriodicalIF":2.4,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098517","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}
PolyhedronPub Date : 2025-01-31DOI: 10.1016/j.poly.2025.117427
R. Bagtache , K. Aouinane , R. Berbakh , M. Trari
{"title":"Preparation and characterization of hybrid material (C2N2H10)0.5CoPO4 application to photocatalysis","authors":"R. Bagtache , K. Aouinane , R. Berbakh , M. Trari","doi":"10.1016/j.poly.2025.117427","DOIUrl":"10.1016/j.poly.2025.117427","url":null,"abstract":"<div><div>This work is devoted to the hydrothermal synthesis at 150 °C of an organic–inorganic hybrid material (C<sub>2</sub>N<sub>2</sub>H<sub>10</sub>)<sub>0.5</sub>CoPO<sub>4</sub> (CoPO-ED) in the presence of cobalt as metal and ethylene diamine as organic matter. Physical characterizations namely X-Ray diffraction (XRD), coupled SEM/EDX analysis, optical microscopy, TG/DTG and chemical analyses, UV–Visible diffuse reflectance, FTIR / Raman spectroscopies and mass spectrometry were undertaken. The SEM image and optical microscopy allows observing both the morphology and colour. The XRD pattern confirms the single phase CoPO-ED, its crystallinity and purity. The optical study reveals a direct (1.81 eV) and indirect (1.72 eV) transitions due to the presence of the Jahn-Teller ion Co<sup>2+</sup> tetrahedrally coordinated. The Raman spectrum shows the existence of organic bonds (C<img>C, C<img>H and C<img>N) and the tetrahedral site of cobalt, thus confirming the structure of CoPO-ED while the mass spectrometry allows elucidating the organic fragments. The title compound has been tested for the first time in photocatalysis through the dyes degradation. For this, we have selected two dyes namely the cationic Methyl Violet (MV) and anionic Methyl Orange (MO), the results show an elimination of 50 and 40 % respectively under visible light after 5 h of irradiation.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"270 ","pages":"Article 117427"},"PeriodicalIF":2.4,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349526","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}
PolyhedronPub Date : 2025-01-28DOI: 10.1016/j.poly.2025.117426
Shagufta Bi, Rashi Srivastava
{"title":"Bottom-up synthesis of palladium nanoparticles: Kinetics effect and catalytic activity","authors":"Shagufta Bi, Rashi Srivastava","doi":"10.1016/j.poly.2025.117426","DOIUrl":"10.1016/j.poly.2025.117426","url":null,"abstract":"<div><div>Green nanotechnology is the term used to describe the ecologically responsible process of manufacturing PdNPs. It is an economical, safe, extensively utilized technology that is also good for the environment. In this work, Pd ions used for the bio-reduced to PdNPs using leaf extract from the <em>Rosa damascena</em> plant. The transmission electron microscopy of the PdNPs was analyzed at approx. 50 nm. This study examines the consequences of three key specifications on the environmental production of PdNPs. Temperature, pH, and volume of leaf extract are significant process factors. A leaf extract volume of 5 ml, pH of 4, and a temperature of 60 °C were more suitable for the maximum production of PdNPs. The volume of leaf extract, pH, and temperature were analyzed at 300 nm, 320 nm, and 350 nm using a UV–Vis spectrum to characterize PdNPs at the SPR band. Within the context of C–C cross-coupling processes, such as Mizoroki-Heck and Suzuki-Miyaura reactions the catalytic activity of PdNPs was examined at mild reaction conditions. For the purpose of characterizing the isolated product, 1H NMR was used. The PdNPs demonstrated a high level of catalytic activity and were able to provide conversion of the products that were being converted.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117426"},"PeriodicalIF":2.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147745","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}
PolyhedronPub Date : 2025-01-27DOI: 10.1016/j.poly.2025.117424
Yuanyuan She, Xuanyan Liu, Wenwei Hu
{"title":"A sustainable and efficient method for preparation of benzothiazole sulfonamides using Fe3O4@SiO2-DiCA/BPY-CuI nanocomposite as a novel reusable catalyst","authors":"Yuanyuan She, Xuanyan Liu, Wenwei Hu","doi":"10.1016/j.poly.2025.117424","DOIUrl":"10.1016/j.poly.2025.117424","url":null,"abstract":"<div><div>In this paper, we successfully developed the Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-DiCA/BPY-CuI nanocomposite and rigorously assessed its catalytic performance in producing benzothiazole sulfonamides. This was achieved through innovative coupling reactions involving 2-amino benzothiazoles, aryl iodides, and K<sub>2</sub>S<sub>2</sub>O<sub>5</sub>, utilizing KOAc in glycerol under mild conditions. Our catalyst, Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-DiCA/BPY-CuI, was synthesized using a straightforward and effective approach, which involves immobilizing copper iodide on Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> nanoparticles modified with a bipyridine ligand. Notably, we stand at the forefront of synthetic chemistry, having achieved the unprecedented production of 21 distinct benzothiazole sulfonamide derivatives for the very first time with this catalyst. Our method aligns perfectly with green chemistry principles, demonstrating exceptional efficiency under gentle conditions. The results of our extensive recycling evaluations highlight the Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>-DiCA/BPY-CuI catalyst as a superior choice for green chemistry applications. It’s remarkable ease of separation from the reaction mixture, combined with its impressive ability to be reused for up to 8 consecutive cycles without any significant decline in catalytic efficacy, underscores its exceptional potential. The outcomes from our tests, evaluations, and comparative analyses reveal that this catalytic system possesses numerous remarkable features, including the high-yield synthesis of various benzothiazole sulfonamide derivatives, environmentally friendly reaction conditions, the utilization of a green solvent, and a catalyst firmly rooted in the principles of green chemistry.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"270 ","pages":"Article 117424"},"PeriodicalIF":2.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372811","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}
PolyhedronPub Date : 2025-01-27DOI: 10.1016/j.poly.2025.117423
Shao-An Hua , Hsin-Yu Chang , Kai-Yan Chen , Mandy M. Lee , Yi-Hung Liu , Shih-Sheng Sun
{"title":"Investigation on photophysical and photochemical properties of Ir and Ru complexes featuring sulfurated pyridine-1,2,3-triazole based ligands","authors":"Shao-An Hua , Hsin-Yu Chang , Kai-Yan Chen , Mandy M. Lee , Yi-Hung Liu , Shih-Sheng Sun","doi":"10.1016/j.poly.2025.117423","DOIUrl":"10.1016/j.poly.2025.117423","url":null,"abstract":"<div><div>In this study, we developed novel pyridine-triazole hybrid ligand scaffolds using the copper-catalyzed azide-alkyne cycloaddition (CuAAC) approach, followed by the incorporation of methylthio functionalization. These ligands were then employed to synthesize ruthenium(II) and iridium(III) complexes, which were comprehensively characterized by NMR spectroscopy, optical spectroscopy, electrochemistry, and single-crystal X-ray diffraction (sXRD). The introduction of a methylthio group in the triazole backbone led to significant anodic shifts in the reduction potentials of the ancillary ligands, attributed to LUMO + 2 stabilization as confirmed by DFT calculations. Ruthenium complexes demonstrated photochemical reactivity, with a low-lying <sup>3</sup>MC (metal-centered) state facilitating thermally accessible non-radiative deactivation via photo-induced ligand release, indicating their potential for photoactivated chemotherapy. In contrast, the iridium complexes exhibited structured emission bands, with triplet excited states localized on the <sup>3</sup>LC state and long luminescence lifetimes (∼1.5 μs), making them promising candidates as phosphors for advanced light-emitting devices. Notably, the dual methylthio groups offer further versatility, including potential for disulfide bond formation under reductive conditions and surface anchoring applications, underscoring the multifunctionality and broad applicability of this ligand design.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117423"},"PeriodicalIF":2.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147749","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}
PolyhedronPub Date : 2025-01-27DOI: 10.1016/j.poly.2025.117425
Rabi Sankar Sarkar , Carlos J. Gómez García , Samia Benmansour , Shouvik Chattopadhyay
{"title":"Solvent-assisted control of the oxidation state in a dinuclear cobalt(II) complex with slow relaxation of the magnetization","authors":"Rabi Sankar Sarkar , Carlos J. Gómez García , Samia Benmansour , Shouvik Chattopadhyay","doi":"10.1016/j.poly.2025.117425","DOIUrl":"10.1016/j.poly.2025.117425","url":null,"abstract":"<div><div>The use of the reduced compartmental N<sub>2</sub>O<sub>4</sub>-donor ligand, H<sub>2</sub>L<sup>r</sup> (= 2,2-dimethyl-1,3-propanediyl-bis(iminomethylene)-bis(6-ethoxyphenol)), containing an inner N<sub>2</sub>O<sub>2</sub> and an outer O<sub>2</sub>O′<sub>2</sub> cavity, with Co<sup>II</sup> in dimethylsulfoxide (dmso) gives rise to a <em>p</em>-nitrobenzoic −bridged cobalt(II) dimer: [(dmso)Co<sup>II</sup>L<sup>r</sup>(μ-RCO<sub>2</sub>)Co<sup>II</sup>(NCS)] (<strong>1</strong>) (RCO<sub>2</sub>H = <em>p</em>-nitrobenzoic acid). The reducing environment of the solvent dmso plays a crucial role in stabilizing cobalt(<span>II</span>) in the complex <strong>1</strong>. The dimeric complex has been structurally characterized by single-crystal X-ray diffraction and various spectroscopic techniques. Magnetic DC and AC susceptibility measurements show very weak ferromagnetic interactions in the complex and a field-induced slow magnetization relaxation (SMR) at relatively low temperatures. For an applied DC field of 100 mT, the complex shows a slow relaxation process that follows Direct and Orbach mechanisms with A = 1.47(5) × 10<sup>4</sup> s<sup>−1</sup> K<sup>−1</sup>, <em>τ</em><sub>0</sub> = 4.0(4) × 10<sup>−8</sup> s and U<sub>eff</sub> = 18(2) K.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117425"},"PeriodicalIF":2.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147750","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}
PolyhedronPub Date : 2025-01-25DOI: 10.1016/j.poly.2025.117421
Tamer H.A. Hasanin , Heba S.M. Abd Elhafez , Mohammed N.I. Shehata , Mohamed Y. El-Sayed , Al-shimaa S.M. Rady , I.M. Ahmed , Mahmoud A.A. Ibrahim
{"title":"Ab initio investigation for π-hole interactions of tetrel- and aerogen-bearing molecules with multiple CO Lewis bases","authors":"Tamer H.A. Hasanin , Heba S.M. Abd Elhafez , Mohammed N.I. Shehata , Mohamed Y. El-Sayed , Al-shimaa S.M. Rady , I.M. Ahmed , Mahmoud A.A. Ibrahim","doi":"10.1016/j.poly.2025.117421","DOIUrl":"10.1016/j.poly.2025.117421","url":null,"abstract":"<div><div>Unconventional π-hole interactions of tetrel-bearing molecules (TO<sub>2</sub> where T = Ge and Sn) with multiple CO Lewis bases were investigated and comparatively addressed with the aerogen analogs (ZF<sub>2</sub> where Z = Kr and Xe) using <em>ab initio</em> calculations. Toward elucidating the occurrence of π-hole interactions, the TO<sub>2</sub>∙∙∙ and ZF<sub>2</sub>∙∙∙(CO)<sub>n</sub> complexes (n = 1–5) were examined. From the point-of-charge (PoC) calculations, stabilization energies were noticed for all TO<sub>2</sub>∙∙∙ and ZF<sub>2</sub>∙∙∙PoC systems, ensuring the potential of TO<sub>2</sub> and ZF<sub>2</sub> molecules to participate in π-hole interactions from the electrostatic perspective. From energy calculations, negative interaction energy (<em>E</em><sub>int</sub>) values were observed for all optimized TO<sub>2</sub>∙∙∙ and ZF<sub>2</sub>∙∙∙(CO)<sub>n</sub> complexes with values up to −15.19 kcal/mol. Additionally, negative <em>E</em><sub>int</sub> values were observed to enhance in the order of TO<sub>2</sub>/ZF<sub>2</sub>∙∙∙(CO)<sub>1</sub> < (CO)<sub>2</sub> < (CO)<sub>3</sub> < (CO)<sub>4</sub> < (CO)<sub>5</sub> complexes. Notably, more negative <em>E</em><sub>int</sub> values were observed for tetrel-bearing complexes than aerogen analogs, outlining the higher favorability of TO<sub>2</sub> molecules to engage in π-hole interactions. From the quantum theory of atoms in molecules and noncovalent interaction index analyses, the favorable nature of the investigated interactions was elucidated. Based on FMOs results, changes in molecular orbital distributions were observed after the interaction with multiple CO LBs, demonstrating the favorability of π-hole interactions within TO<sub>2</sub>∙∙∙ and ZF<sub>2</sub>∙∙∙(CO)<sub>n</sub> complexes. Subsequently, alterations in the calculated electronic parameters were observed following the interaction with CO LBs, outlining the occurrence of π-hole interactions within TO<sub>2</sub>∙∙∙ and ZF<sub>2</sub>∙∙∙(CO)<sub>n</sub> complexes. Such π-hole interactions would be underpinning for the forthcoming studies relevant to supramolecular chemistry and crystal engineering fields.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117421"},"PeriodicalIF":2.4,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147752","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}
PolyhedronPub Date : 2025-01-25DOI: 10.1016/j.poly.2025.117419
Surekha S. Jogdand , Satyawati S. Joshi
{"title":"Effect of polymer combustion synthesis on thermal, spectroscopic, structural, and magnetic properties of Co3O4 nanoparticles","authors":"Surekha S. Jogdand , Satyawati S. Joshi","doi":"10.1016/j.poly.2025.117419","DOIUrl":"10.1016/j.poly.2025.117419","url":null,"abstract":"<div><div>We synthesized Co<sub>3</sub>O<sub>4</sub> nanoparticles using polyethylene glycol by polymer combustion method. The pristine sample was annealed at 300, 500 and 800 °C. Fourier transform infrared spectroscopy (FTIR) was used to investigate the molecular mechanisms of degradation process in connection with thermal gravimetry (TG) and Differential Thermal Analysis (DTA). Raman studies indicate the shifting of all modes of Co<sub>3</sub>O<sub>4</sub> towards the higher wave number indicating the interaction between Co<sub>3</sub>O<sub>4</sub> nanoparticles and polymer matrix; supports the FTIR observation. Transmission Electron Microscopy (TEM) analysis show formation of single crystalline spinel phase. The magnetic properties are discussed in correlation with FTIR with respect to behavior of polymer. Highest coercivity of 214 G was observed for Co<sub>3</sub>O<sub>4</sub> nanoparticles annealed at 300 °C from that of bulk Co<sub>3</sub>O<sub>4</sub>. The anomalous magnetic behavior observed in 300 °C annealed sample seems to be due to surface adsorption of OH groups and degradation of polyethylene glycol into hydroperoxide and conjugated double bond [<img>C<img>C<img>]. The conjugated C<img>C due to collective states of the π-electrons in the polymeric matrix may be involved in the magnetic behavior.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117419"},"PeriodicalIF":2.4,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147748","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}