Jingze Wang, Bo Jing, Xinke Xu, Wenjun Li, Zhidong Chang, Changyan Sun
{"title":"An ultra-sensitive probe based on Zn-MOF for detection of vanillin and Cr(VI)","authors":"Jingze Wang, Bo Jing, Xinke Xu, Wenjun Li, Zhidong Chang, Changyan Sun","doi":"10.1016/j.ica.2025.122697","DOIUrl":"10.1016/j.ica.2025.122697","url":null,"abstract":"<div><div>Vanillin is widely used in food production, but excessive consumption can cause health problems, so the detection of vanillin is of great significance for food safety. In this paper, a fluorescent sensor (Zn-MOF) for the effective recognition of vanillin was developed. The fluorescence of Zn-MOF was quenched by vanillin and the detection mechanism could be attributed to competitive absorption and photoelectron-induced transfer. The detection limit was calculated 1.44 × 10<sup>−9</sup> M, which is the lowest among MOF fluorescent probes for vanillin. Notably, filter paper strips based on Zn-MOF could be used for visual detection of vanillin and the Zn-MOF sensor could be applied for quantitative analysis of vanillin in food samples. Moreover, the multifunctional probe's ability to detect Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup>/CrO<sub>4</sub><sup>2−</sup> with detection limits of 8.22 × 10<sup>−9</sup> / 7.73 × 10<sup>−9</sup> M underscores its versatile analytical potential. The practical application of Zn-MOF in biscuits and river water has yielded recoveries ranging from 98.33 % to 100.7 %, with outstanding reproducibility (RSD = 0.47 % ~ 3.30 %).</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122697"},"PeriodicalIF":2.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808689","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":"Comprehensive spectroscopic, electrochemical, X-ray crystal structure and QTAIM/ NCI-RDG analyses computations of a new Bis(η1-Formato) chromium(III) Meso-arylporphyrin complex - theoretical insights into sensing efficiency for CO2, NO2 and O2 gases","authors":"Fradi Taissir , Azhar Kechiche , Bouzid Gassoumi , Soumaya Nasri , Houcine Ghalla , Frédérique Loiseau , Florian Molton , Noureddine Issaoui , Ilona Turowska-Tyrk , Habib Nasri","doi":"10.1016/j.ica.2025.122687","DOIUrl":"10.1016/j.ica.2025.122687","url":null,"abstract":"<div><div>Herein, we have presented a new chromium(III) hexacoordinated metalloporphyrin with two η<sup>1</sup>-formato axial ligands. Based on the single crystal X-ray molecular structure, the formula of this new coordination compound is [Na(crypt-222)][Cr<sup>III</sup>(TMPP)(η<sup>1</sup>-OCOH)<sub>2</sub>]<sup>•</sup>0.3CH<sub>2</sub>Cl<sub>2</sub>0<sup>•</sup>3H<sub>2</sub>O (complex <strong>I</strong>), where TMPP is the (<em>meso</em>-tetra(<em>para</em>-methoxyphenyl)porphyrinate and crypt-222 is the cryptand-222. UV/Vis, fluorescence, infrared, mass spectrometry, and cyclic voltammetry techniques were employed for a complete characterization and the electronic properties study of complex <strong>I</strong>. A Hirshfeld surface analysis was performed to elucidate the intermolecular interactions responsible for the stability of the crystal lattice of complex <strong>I</strong>. In order to get further information on the intermolecular interactions and the reactivity of the title compound, DFT/TDDFT calculations were carried out, including molecular structure optimization using the DFT/B3LYP-D3/LanL2DZ level of theory, the frontier molecular orbitals (FMOs) calculations, the molecular electronic potential analysis (MEP), and the QTAIM-NCI-RDG analyses. Furthermore, the sensing efficiency of our new chromium(III) metalloporphyrin for the CO<sub>2</sub>, NO<sub>2</sub>, and O<sub>2</sub> gas molecules is also reported.</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122687"},"PeriodicalIF":2.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817092","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}
Pinyu Zhao , Junwei Ma , Yang Shi , Xiumei Du , Nana Li , Qianli Li , Rufen Zhang
{"title":"Six organotin(IV) complexes derived from 4-(phenylsulfonamido)benzoic acid: Synthesis, crystal structure, in vitro cytostatic activity, antifungal activity evaluation and molecular docking study","authors":"Pinyu Zhao , Junwei Ma , Yang Shi , Xiumei Du , Nana Li , Qianli Li , Rufen Zhang","doi":"10.1016/j.ica.2025.122695","DOIUrl":"10.1016/j.ica.2025.122695","url":null,"abstract":"<div><div>Six new organotin(IV) complexes, [(Me<sub>3</sub>Sn)<sub>2</sub>L] (<strong>1</strong>) [(R<sub>3</sub>Sn)L] (R = Et <strong>2</strong>, R = Ph <strong>4</strong>), [(<em>n</em>-Bu<sub>3</sub>Sn)L]<sub>n</sub> (<strong>3</strong>), [(Me<sub>2</sub>Sn)<sub>4</sub>(<em>μ</em><sub>3</sub>-O)<sub>2</sub>(<em>μ</em><sub>2</sub>-OCH<sub>3</sub>)<sub>2</sub>L<sub>2</sub>] (<strong>5</strong>) and [(<em>n</em>-Bu<sub>2</sub>Sn)<sub>4</sub>(<em>μ</em><sub>3</sub>-O)<sub>2</sub>L<sub>4</sub>] (<strong>6</strong>), were synthesized through the reaction of organotin(IV) oxides or organotin(IV) chlorides with 4-(phenylsulfonamido)benzoic acid (HL), and characterized by elemental analyses, FT-IR, (<sup>1</sup>H, <sup>13</sup>C and <sup>119</sup>Sn) NMR and single-crystal X-ray diffraction. The X-ray crystallography analyses revealed that complexes <strong>1</strong>–<strong>2</strong> and <strong>4</strong>–<strong>6</strong> exhibit monomeric structures, while complex <strong>3</strong> displays 1D chain structure. And then 1D chain structures were formed through intermolecular hydrogen bonding in complexes <strong>1</strong> and <strong>2</strong>, and 2D mesh structures were respectively formed due to intermolecular hydrogen bonding in complexes <strong>3</strong>–<strong>6</strong>. Furthermore, the <em>in vitro</em> cytostatic activities of complexes <strong>1–4</strong> against HeLa, HepG-2 and A549 were evaluated by MTT assays. The results displayed that tributyltin derivative <strong>3</strong> and triphenyltin derivative <strong>4</strong> exhibited the high potent cytostatic activity against the tested cell lines. Moreover, the anticancer mechanism of triphenyltin derivative <strong>4</strong> against HeLa cells was preliminarily investigated, which indicated that the complex <strong>4</strong> induces the mitochondrial membrane potential collapse and cell apoptosis. Additionally, the antifungal activity of complexes <strong>1–4</strong> against three strains fungi has been evaluated, which indicated that triphenyltin derivative <strong>4</strong> exhibited visible antifungal effect. Further, the binding affinity of complex <strong>4</strong> with DNA and bovine serum albumin (BSA) was investigated by molecular docking simulations, suggesting their capacity to interact with these biomolecules. This study provides new insights for further development of triphenyltin derivative as potential drug candidates.</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122695"},"PeriodicalIF":2.7,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817091","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}
Hatice Gamze Sogukomerogullari , Ahmet Oral Sarıoğlu , Remziye Aysun Kepekçi , Burçin Türkmenoğlu , Mehmet Hakan Morcali
{"title":"Copper(II), cobalt(II), nickel(II), and iron(II) mixed complexes formed by Schiff base and 1,10-phenanthroline as secondary chelates: Preparation, characterization, antimicrobial, antioxidant, and molecular docking studies","authors":"Hatice Gamze Sogukomerogullari , Ahmet Oral Sarıoğlu , Remziye Aysun Kepekçi , Burçin Türkmenoğlu , Mehmet Hakan Morcali","doi":"10.1016/j.ica.2025.122692","DOIUrl":"10.1016/j.ica.2025.122692","url":null,"abstract":"<div><div>This study details the synthesis and characterization of new metal complexes formed by combining 2-((2-mercaptophenylimino)methyl)-4-methoxy-6-nitrophenol (L<sub>1</sub>) and 1,10-phenantroline (L<sub>2</sub>) ligands. The ligand (L<sub>1</sub>) and its mixed-ligand complexes with Co (II), Cu (II), Fe (II), and Ni (II) salts was analyzed using elemental analysis, FT-IR, UV–Vis, mass spectrometry, <sup>1</sup>H and <sup>13</sup>C NMR, magnetic susceptibility, and molar conductivity studies. The development of non-electrolytic compounds in a 1:1:1 M (L<sub>1</sub>:M:L<sub>2</sub>) ratio was verified by elemental analysis and conductance measurements. The complexes displayed an octahedral configuration. Biological uses of newly synthesized complexes were suggested by their antibacterial and antioxidant properties. Especially, the Fe (II) complex exhibited higher antimicrobial activity than free ligand on all the tested microbial strains according to the results of agar disc difffusion assay (inhibition zones ranging from 09.50 ± 0.70 and 19.50 ± 0.70 mm) and broth microdilution test (MIC values ranging between 97.66 and 781.25 μM) The highest antioxidant activity, among ligand and its metal complexes, were recorded for Ni (II) complex with IC<sub>50</sub> value 59.17 ± 01.94 μM. The compounds with antimicrobial and antioxidant effects were further investigated <em>via in silico</em> approaches. The binding parameter values were calculated for the effectiveness of [FeL<sub>1</sub>L<sub>2</sub>H<sub>2</sub>O].3H<sub>2</sub>O complexes on the antimicrobial target and [NiL<sub>1</sub>L<sub>2</sub>H<sub>2</sub>O].2H<sub>2</sub>O complexes on the antioxidant target in molecular docking.</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122692"},"PeriodicalIF":2.7,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808688","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":"Corrigendum to “Preparation and properties of a series of discrete zinc-rare earth heterometallic complexes based on 2,4-dichlorobenzoate and 2,2′-bipyridine” [Inorganica Chimica Acta 581 (2025) 122644]","authors":"Shu-Fang Zheng, Jin-Sheng Zhang, Zhen-Yu Yang, Dong-Mei Ren, Bin-Qiu Liu, Ju-Wen Zhang","doi":"10.1016/j.ica.2025.122685","DOIUrl":"10.1016/j.ica.2025.122685","url":null,"abstract":"","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"582 ","pages":"Article 122685"},"PeriodicalIF":2.7,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877352","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":"UV–vis spectra and catalytic activity of cobalt octacarboxyphthalocyanine in aerobic oxidation of 2-mercaptoethanol and sodium sulphide in buffered solutions","authors":"Artur Suchan, Joanna Nackiewicz","doi":"10.1016/j.ica.2025.122688","DOIUrl":"10.1016/j.ica.2025.122688","url":null,"abstract":"<div><div>This paper demonstrates the UV–Vis spectra and catalytic activity of cobalt octacarboxyphthalocyanine (CoPcOC) in the aerobic oxidation of 2-mercaptoethanol (ME) and sodium sulphide in buffered aqueous solutions.</div><div>The reaction rates of the oxidation process under investigation, as well as the spectra and association of CoPcOC, are strongly pH-dependent. The addition of sodium sulphide and ME to buffered CoPcOC solutions induced significant spectral changes, primarily in the Q band, but also in the 400–500 nm range.</div><div>Spectral changes indicated a complexation of CoPcOC with ME molecules and HS¯ ions, followed by partial reduction of the phthalocyanine metal centre from Co(II) to Co(I). The CoPcOC species, with Co(I) and Co(II), coexist in equilibrium in the solutions. For the reduced Co(I)PcOC form, characteristic bands appeared at 450–550 nm and ∼ 730 nm, corresponding to LMCT and Q<sub>(0–0)</sub>, respectively. Increasing pH enhanced the reaction rates of catalytic aerobic oxidations of ME and Na<sub>2</sub>S up to pH approx.6.5 then a decrease in activity occurs. The oxidation kinetics of the investigated substrates in the presence of CoPcOC exhibit enzyme-like behaviour and are described using bisubstrate Michaelis-Menten theory. The <em>K</em><sub>m</sub> values for both ME and Na<sub>2</sub>S at pH 8.0 are similar, approximately 2·10<sup>−4</sup> mol/dm<sup>3</sup>. The <em>K</em><sub>m</sub> and <em>V</em><sub>max</sub> values calculated for ME oxidation by CoPcOC are lower than those reported in earlier literature. Na<sub>2</sub>S oxidation in neutral and alkaline media indicated the presence primarily of thiosulphate ions, and also a lack of sulphate or sulfite ions. In acidic solutions, thiosulphate ions convert to elemental (colloidal) sulphur.</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122688"},"PeriodicalIF":2.7,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799828","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":"Lanthanide complexes containing pentadentate s-triazine-based Schiff base ligand: Synthesis, structure and magnetic features","authors":"Ján Vančo, Zdeněk Trávníček","doi":"10.1016/j.ica.2025.122690","DOIUrl":"10.1016/j.ica.2025.122690","url":null,"abstract":"<div><div>Five mononuclear Ln(III) complexes {Ln = Gd (<strong>1</strong>), Tb (<strong>2</strong>), Dy (<strong>3</strong>), Ho (<strong>4</strong>) and Er (<strong>5</strong>)} of the general composition [Ln(L)(NO<sub>3</sub>)(H<sub>2</sub>O)]⋅solv (solv = H<sub>2</sub>O and/or DMF) were synthesized and thoroughly characterized. The pentadentate H<sub>2</sub>L Schiff base ligand, formed by condensation of 2,4-bishydrazino-6-amino-<em>s</em>-triazine with 3-ethoxysalicylaldehyde, is coordinated to the Ln(III) atoms in the N<sub>3</sub>O<sub>2</sub> donor set in an equatorial plane. The coordination geometry of the central metal atoms is then completed by a bidentate-bonded nitrato ligand and one water molecule, thus forming a biaugmented trigonal prism environment, as follows from the X-ray structure of complex <strong>1</strong>. A detailed magnetic evaluation (static (<em>dc</em>) and dynamic (<em>ac</em>) data) of complexes <strong>1</strong>–<strong>5</strong> uncovered that they behave as magnetically diluted paramagnetics with weak antiferromagnetic features originating probably in the presence of non-covalent bonding in the solid samples. Only the complexes of Dy (<strong>3</strong>) and Er (<strong>5</strong>) showed signs of slow relaxation of magnetization with the estimated energy barrier values of <em>U</em><sub>eff</sub> = 9.4 (5) K (for <strong>3</strong>) and <em>U</em><sub>eff</sub> = 9.9 (6) K (for <strong>5</strong>), and relaxation times of τ<sub>0</sub> = 0.25 (8) μs (for <strong>3</strong>) and τ<sub>0</sub> = 0.45(9) μs (for <strong>5</strong>).</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122690"},"PeriodicalIF":2.7,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808747","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":"Optical recognition of Y(III) using a naphthalene based tetra-imine derivative andamide-imine based iron complex","authors":"Tandrim Shyam , Sisir Lohar , Debasis Das","doi":"10.1016/j.ica.2025.122689","DOIUrl":"10.1016/j.ica.2025.122689","url":null,"abstract":"<div><div>A naphthalene based tetra-imine derivative <strong>(DNB)</strong>, prepared by condensation of 2-(amino methyl)-aniline with 2-hydroxy naphthaldehyde and 2, 6-(diformyl)-<em>p</em>-cresol in a sequential manner can detect Y(III) <em>via</em> sky blue emission (λ<sub>em</sub> = 478 nm, λ<sub>ex</sub> = 400 nm)in aqueous DMSO media. On the other hand, a Fe(II) complex (<strong>MTASFe</strong>), derived from an amide-imine conjugate also recognizes Y(III) through blue emission (λ<sub>em</sub> = 454 nm, λ<sub>ex</sub> = 300 nm) in the same media. For the first case, the sensing is attributed to the chelation of Y(III) by <strong>DNB</strong> leading to inhibition of excited state intra-molecular proton transfer (ESIPT) whereas the displacement of Fe(II) by Y(III) from <strong>MTASFe</strong> is responsible for fluorescence enhancement in later case. The limit of detection of <strong>DNB</strong> and <strong>MTASFe</strong> for Y(III) are 17.56 nM and 68.33 nM respectively. Silica immobilized <strong>DNB</strong> is capable of solid-phase extractive recovery of Y(III). <strong>DNB</strong> impregnated paper strip is suitable for optical detection of Y(III).</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122689"},"PeriodicalIF":2.7,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817090","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":"Single-step synthesis of diethylenetriamine-functionalized organosilicas using various structuring agents: key insights and Cu(II)/Ni(II) complexation behavior","authors":"Veronika Tomina , Nataliia Stoliarchuk , Maksym Fizer , Jaroslav Briancin , Olha Semeshko , Inna Melnyk","doi":"10.1016/j.ica.2025.122683","DOIUrl":"10.1016/j.ica.2025.122683","url":null,"abstract":"<div><div>Diethylenetriamine-functionalized silica materials were synthesized via a one-step sol-gel method using various structuring agents. The resulting materials, incorporating triamine groups, were characterized by SEM, FTIR, nitrogen adsorption-desorption. They exhibited particle sizes of 60–70 nm, triamine group contents of 1.3–2.3 mmol/g, and a porosity range from non-porous to porous samples with specific surface areas up to 400 m<sup>2</sup>/g, while FTIR confirmed the presence of both the functional groups and the polysiloxane framework. Adsorption studies focused on Cu(II) and Ni(II) ions revealed distinct complexation mechanisms influenced by the structural features of the materials and the concentrations of metal ions. Specifically, the adsorption capacity reached up to 0.97 mmol/g for Ni(II) and up to 1.86 mmol/g for Cu(II). FTIR and UV–vis diffuse reflectance spectra confirmed the coordination of metal ions with nitrogen-containing groups, with shifts and simplifications in complex structures observed at higher ion concentrations. Variations in sorption capacity and stability constants demonstrated the role of material design in enhancing adsorption efficiency. These findings reveal the intricate interplay between amino groups and Cu(II)/Ni(II) ions, deepening our understanding of the underlying coordination mechanisms and paving the way for the rational design of advanced functional materials with broad implications across various scientific disciplines.</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122683"},"PeriodicalIF":2.7,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799829","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}
Changzhong Liang , Yixin Feng , Poe Ei Phyu Win , Jiong Wang
{"title":"A mechanism study on performance of iron metal coordination polymers in the electrosynthesis of hydrogen peroxide","authors":"Changzhong Liang , Yixin Feng , Poe Ei Phyu Win , Jiong Wang","doi":"10.1016/j.ica.2025.122686","DOIUrl":"10.1016/j.ica.2025.122686","url":null,"abstract":"<div><div>To tune the oxidation states of metal active sites represents a classical strategy to achieve efficient two-electron oxygen reduction reaction (2e<sup>−</sup>-ORR) catalysts for electrosynthesis of H<sub>2</sub>O<sub>2</sub>. In this work, iron (Fe)-1,2,4,5-tetrahydroxybenzene (H<sub>4</sub>thb) coordination polymers were obtained by a common hydrothermal synthesis for efficient 2e<sup>−</sup>-ORR electrocatalysis with tuning the oxidation states of Fe sites. This caused tuned coordination in polymers by generating planar Fe-O<sub>4</sub> sites, and octahedral Fe-O<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub> sites that carrying two extra water molecules at the axial position of Fe sites. Despite the axial water coordination improved the electrical conductivity and numbers of electrochemical active Fe sites of resultant polymers, the Fe-O<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub> sites exhibited limited performance. While the planar Fe-O<sub>4</sub> coordination greatly promotes the electron delocalization at the Fe center, which facilitates O<sub>2</sub> chemisorption and activation, and intrinsically improved the 2e<sup>−</sup>-ORR performance of Fe sites.</div></div>","PeriodicalId":13599,"journal":{"name":"Inorganica Chimica Acta","volume":"583 ","pages":"Article 122686"},"PeriodicalIF":2.7,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759220","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}