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Ligand-driven redox behavior of gold(III) complexes: electrochemical insights into stability and biological potential 配体驱动的金(III)配合物的氧化还原行为:稳定性和生物潜力的电化学见解
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-12 DOI: 10.1016/j.poly.2025.117730
L. Messori , L. Massai , F. Fabrizi de Biani , M. Corsini
{"title":"Ligand-driven redox behavior of gold(III) complexes: electrochemical insights into stability and biological potential","authors":"L. Messori ,&nbsp;L. Massai ,&nbsp;F. Fabrizi de Biani ,&nbsp;M. Corsini","doi":"10.1016/j.poly.2025.117730","DOIUrl":"10.1016/j.poly.2025.117730","url":null,"abstract":"<div><div>Gold(III) compounds are an important class of experimental drugs with potential use in the treatment of cancer. It is believed that the remarkable oxidizing nature of the gold(III) centre, which is variably modulated by the metal ligands, may play a key role in determining their reactivity with biomolecules and, hence, their mode of action. Here, we present a systematic electrochemical investigation of five structurally diverse mononuclear gold(III) complexes (i.e. Auen, Audien, Aucyclam, Aubipy and Aubipy<sup>c</sup>) the chemical and cytotoxic properties of which have previously been determined in our laboratory. The electrochemical profiles of the panel compounds were comparatively investigated by cyclic voltammetry (CV) both in aqueous solution and in DMSO to explore solvent-dependent redox behavior under biologically relevant conditions. The results highlight the influence of ligand denticity and coordination flexibility on the stabilization of the Au(III) center and the accessibility of redox processes of the redox processes within the biological environment. The electrochemical profiles obtained for this panel of gold(III) complexes are analyzed and compared with their known biological and antiproliferative profiles to explore possible structure-activity relationships within a unified interpretative framework.</div><div>Overall, these findings highlight the delicate balance between stability and reactivity required for gold-based drugs to achieve their therapeutic effect, and suggest that electrochemical profiling can inform the rational design of redox-activated anticancer agents.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117730"},"PeriodicalIF":2.6,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144860772","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}
引用次数: 0
Zn(II) hydrogen–bonded organic framework derived ZnO@C nanoparticles for dye degradation Zn(II)氢键有机骨架衍生的ZnO@C染料降解纳米颗粒
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-12 DOI: 10.1016/j.poly.2025.117732
Souvik Pal , Hari Pada Nayek
{"title":"Zn(II) hydrogen–bonded organic framework derived ZnO@C nanoparticles for dye degradation","authors":"Souvik Pal ,&nbsp;Hari Pada Nayek","doi":"10.1016/j.poly.2025.117732","DOIUrl":"10.1016/j.poly.2025.117732","url":null,"abstract":"<div><div>A three-dimensional metal hydrogen-bonded organic framework (M-HOF), designated as [Zn<sub>2</sub>(H<sub>2</sub>tma)<sub>2</sub>(ad)<sub>2</sub>·4H<sub>2</sub>O]·4H<sub>2</sub>O (<strong>1</strong>), was synthesized through a solvothermal reaction utilizing trimesic acid (H<sub>2</sub>tma<sup>−</sup>: singly deprotonated form of trimesic acid) and adeninate ligand (ad<sup>−</sup>) as ligands. The complex was characterized using standard analytical techniques, including single-crystal X-ray diffraction, which confirmed its structural integrity. Additionally, powder X-ray diffraction verified the purity of the bulk material. The framework consists of two six-coordinated Zn(II) ions, two H<sub>2</sub>tma<sup>−</sup> ligands, two adeninate ligands, and eight water molecules, which serve either as coordinated solvent molecules or as solvents of crystallization. The formation of a stable framework structure is attributed to the presence of hydrogen bonds. Hirshfeld surface analysis was employed to quantify the various hydrogen bonding interactions present in the system. Following the synthesis, complex <strong>1</strong> underwent calcination, leading to the formation of carbon-containing ZnO nanoparticles (ZnO@C NPs), which were subsequently characterized using multiple analytical techniques. The photocatalytic activity of the prepared nanoparticles was evaluated for the degradation of methylene blue (MB), with an investigation into the effects of catalyst loading, pH, and dye concentration. A proposed mechanism for the degradation process was outlined, highlighting the potential applications of these nanoparticles in environmental remediation.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117732"},"PeriodicalIF":2.6,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144866064","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}
引用次数: 0
Novel metallophthalocyanines bearing 2-(2-bromophenyl)ethoxy groups: Elucidating the effect of the central atom on singlet oxygen production via photochemical and sono-photochemical processes 含2-(2-溴苯基)乙氧基的新型金属酞菁:通过光化学和声光化学过程阐明中心原子对单线态氧产生的影响
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-11 DOI: 10.1016/j.poly.2025.117700
Begüm Bal , Öznur Dülger Kutlu , İsmail Değirmencioğlu , Ali Erdoğmuş
{"title":"Novel metallophthalocyanines bearing 2-(2-bromophenyl)ethoxy groups: Elucidating the effect of the central atom on singlet oxygen production via photochemical and sono-photochemical processes","authors":"Begüm Bal ,&nbsp;Öznur Dülger Kutlu ,&nbsp;İsmail Değirmencioğlu ,&nbsp;Ali Erdoğmuş","doi":"10.1016/j.poly.2025.117700","DOIUrl":"10.1016/j.poly.2025.117700","url":null,"abstract":"<div><div>Photodynamic therapy (PDT) and sonodynamic therapy (SDT) have been developed as alternatives to conventional treatment modalities in the treatment of cancer. The combination of these methods, sono-photodynamic therapy (SPDT), has a higher efficacy than the effective success rates of these two applications alone. The high singlet oxygen production potential of phthalocyanine complexes and their high sensitivity to sound and light make these compounds suitable sensitizers for SPDT and are of great interest to researchers. This study aims to investigate the effect of the central metal ion on the photochemical and sonophotochemical properties of phthalocyanine complexes and to evaluate their potential for use in SPDT, taking into account their singlet oxygen production. For this purpose, tetra-substituted zinc(II) (<strong>4</strong>), magnesium(II) (<strong>5</strong>) and biaxially substituted Si(IV) (<strong>6</strong>) phthalocyanines containing novel phthalonitrile derivatives were synthesized and characterized and the photochemical and sono-photochemical properties of these complexes in DMF were investigated. The results obtained from the excitation of the synthesized compounds by light irradiation and the synergistic effect of light and sound showed that singlet oxygen production increased with increasing heavy atom effect in the molecule. With the photochemical method using light irradiation, Φ<sub>Δ</sub> values for phthalocyanines (<strong>4</strong>, <strong>5</strong> and <strong>6</strong>) were 0.58, 0.38 and 0.40, respectively, whereas with the sono-photochemical method using the synergistic effect of light and ultrasound, Φ<sub>Δ</sub> values reached 0.70 for <strong>4</strong>, 0.54 for <strong>5</strong> and 0.58 for <strong>6</strong>. The data obtained proved that the singlet oxygen production increased slightly by changing the method from light radiation to ultrasound/light. This demonstrated the sensitivity of <strong>4</strong>, <strong>5</strong> and <strong>6</strong> to sound. These data indicate that compounds (4, 5 and 6) may be a promising agent in SPDT applications eliminating the disadvantages of PDT and SDT applications. This study will be a pioneer in understanding the sono-photochemical measurements of phthalocyanine compounds for future studies on sono-photosensitizers.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117700"},"PeriodicalIF":2.6,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144866085","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}
引用次数: 0
Design and development of a novel electrode for CH activation in the electro-organic synthesis of indoles using Al nanoparticles on graphene oxide modified with NH2-MIL-101(Al) as an Ammonia-trapping MOF in NaCl electrolyte 以NH2-MIL-101(Al)修饰的氧化石墨烯上的Al纳米颗粒作为在NaCl电解质中捕获氨的MOF,设计并开发了一种用于吲哚电有机合成中CH活化的新型电极
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-11 DOI: 10.1016/j.poly.2025.117729
Karkaz Thalij , Zaman Abdalhussein Ibadi Alaridhee , Khalaf Nahar Ahmed , Amer Alhaj Zen , Shaxnoza Saydaxmetova , Mohammed B. Alqaraguly , I.B. Sapaev , Elyor Berdimurodov , Mahdi Alsalim , Rustamkhon Kuryazov , Abdulrahman A. Almehizia
{"title":"Design and development of a novel electrode for CH activation in the electro-organic synthesis of indoles using Al nanoparticles on graphene oxide modified with NH2-MIL-101(Al) as an Ammonia-trapping MOF in NaCl electrolyte","authors":"Karkaz Thalij ,&nbsp;Zaman Abdalhussein Ibadi Alaridhee ,&nbsp;Khalaf Nahar Ahmed ,&nbsp;Amer Alhaj Zen ,&nbsp;Shaxnoza Saydaxmetova ,&nbsp;Mohammed B. Alqaraguly ,&nbsp;I.B. Sapaev ,&nbsp;Elyor Berdimurodov ,&nbsp;Mahdi Alsalim ,&nbsp;Rustamkhon Kuryazov ,&nbsp;Abdulrahman A. Almehizia","doi":"10.1016/j.poly.2025.117729","DOIUrl":"10.1016/j.poly.2025.117729","url":null,"abstract":"<div><div>This study outlines the design and development of a new electrode for C<img>H activation in the electro-organic synthesis of indole derivatives, utilizing Al nanoparticles supported on graphene oxide modified with NH<sub>2</sub>-MIL-101(Al) as an ammonia-trapping metal-organic framework (MOF) in a NaCl electrolyte. The synthesized GO-NH<sub>2</sub>-MIL-101(Al) composite exhibits enhanced electrochemical properties, facilitating efficient electro-oxidation reactions. The integration of NH<sub>2</sub>-MIL-101(Al) not only enhances the surface area and porosity but also effectively traps ammonia, optimizing the reaction conditions for indole synthesis. This innovative approach highlights the potential of combining advanced materials for improved catalytic performance in electro-organic synthesis, Opening new avenues for more sustainable and efficient electrochemical processes. Following the design and synthesis of the GO-NH<sub>2</sub>-MIL-101(Al) catalyst, its structure and morphology were characterized using FT-IR, EDX, XPS, SEM, EDS, TGA, BET, TEM and CV analyses. The catalytic performance was then evaluated in electro-organic reactions, where derivatives of 1-phenylpropan-2-one <strong>1(a-l)</strong> were reacted with ammonia gas <strong>2(a)</strong> to synthesize various indole derivatives <strong>4(a-l)</strong> with yields ranging from 90 % to 97 %. Finally, the synthesized indole derivatives were characterized by melting point analysis, FT-IR, 1HNMR, and CHN analyses</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117729"},"PeriodicalIF":2.6,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144866063","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}
引用次数: 0
Structure and magnetic properties of spin-labeled N-alkyl-pyridinium nitrates 自旋标记n-烷基-硝酸吡啶的结构和磁性能
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-09 DOI: 10.1016/j.poly.2025.117728
Sergey Fokin , Svyatoslav Tolstikov , Platon Chernavin , Artem Bogomyakov , Galina Romanenko
{"title":"Structure and magnetic properties of spin-labeled N-alkyl-pyridinium nitrates","authors":"Sergey Fokin ,&nbsp;Svyatoslav Tolstikov ,&nbsp;Platon Chernavin ,&nbsp;Artem Bogomyakov ,&nbsp;Galina Romanenko","doi":"10.1016/j.poly.2025.117728","DOIUrl":"10.1016/j.poly.2025.117728","url":null,"abstract":"<div><div>A series of new salts with paramagnetic cations – N-alkylpyridinium nitrates (NN<sup>p/m</sup>R)NO<sub>3</sub> (where NN<sup>p/m</sup>R is 2-(4-N-R-pyridinium)- and 2-(3-N-R-pyridinium)-4,4,5,5-tetramethyl-4,5-dihydro-1<em>H</em>-imidazo-1-oxyl-3-oxide; R = Me, Et) – were synthesized and structurally and magnetochemically characterized. All compounds – (NN<sup>p</sup>Me)NO<sub>3</sub>, (NN<sup>m</sup>Me)NO<sub>3</sub>•<sup>1</sup>/<sub>3</sub>MeCN•<sup>1</sup>/<sub>6</sub>H<sub>2</sub>O and (NN<sup>p</sup>Et)NO<sub>3</sub> – were obtained by the interaction of iodides (NN<sup>p/m</sup>R)I with AgNO<sub>3</sub>, including a double complex salt of unusual composition (NN<sup>m</sup>Et)<sub>6</sub>[Ag(NO<sub>3</sub>)<sub>3</sub>](NO<sub>3</sub>)<sub>4</sub>. It is shown that cation-anionic interactions are decisive, facilitating the formation of cation-radical layers with short distances between paramagnetic fragments. The practically constant values of the effective magnetic moment for all the studied compounds in the temperature range 50–300 K are close to 1.73 μ<sub>B</sub>. Quantum-chemical calculations have shown that such values, corresponding to the theoretical value for the monoradical, are associated with a combination of ferro- and antiferromagnetic exchange interactions between paramagnetic centers in numerous exchange channels. In this case, the contribution to the exchange energy is made by interactions not only between nitroxyl groups, but also between pyridine cycles.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117728"},"PeriodicalIF":2.6,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144830173","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}
引用次数: 0
Semiconductor-nonmagnetic TiBr₂ dihalide doped with 3d transition metals: electronic and magnetic properties 掺杂三维过渡金属的半导体非磁性TiBr 2二卤化物:电子和磁性
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-09 DOI: 10.1016/j.poly.2025.117725
Mojtaba Gholami, Bahareh Azarvand-Hassanfard
{"title":"Semiconductor-nonmagnetic TiBr₂ dihalide doped with 3d transition metals: electronic and magnetic properties","authors":"Mojtaba Gholami,&nbsp;Bahareh Azarvand-Hassanfard","doi":"10.1016/j.poly.2025.117725","DOIUrl":"10.1016/j.poly.2025.117725","url":null,"abstract":"<div><div>In this study, spin-polarized first-principles calculations are employed to investigate the electronic and magnetic properties of TiBr₂ monolayers doped with 3d transition metal (TM) elements. Our results reveal that the pristine TiBr₂ monolayer exhibits non-magnetic semiconducting behavior with andirect bandgap of approximately 1.1 eV. Except for doping with Sc and V, all 3d transition metal-doped TiBr₂ monolayers display significant magnetic moments, ranging from 1.8 to 4.6 μB, with the Co-doped configuration exhibiting the maximum moment of 4.6 μB. The total magnetic moment in the Cr-, Mn-, Fe-, and Co-doped TiBr₂ monolayers is primarily attributed to the strong hybridization between the d orbitals of the TM dopants and those of the Ti host. Conversely, in the cases of Ni, Cu, and Zn doping, the magnetic moment arises solely from the Ti-3d orbitals, indicating slight involvement of the dopant states. According to our calculations, among the 3d transition metal dopants, only the Sc impurity induces metallic behavior in the TiBr₂ monolayer. In contrast, Mn-, Fe-, and Ni-doped systems demonstrate semi-metallic phase, characterized by spin-dependent bandgaps of (E<sup>↑</sup>g = 0, E<sub>↓</sub>g = 0.75), (E<sup>↑</sup>g = 0, E<sub>↓</sub>g = 0.62), and (E<sup>↑</sup>g = 0, E<sub>↓</sub>g = 0.70 eV), respectively. Except for the V-doped configuration, all other doped TiBr₂ monolayers retain their semiconducting nature. The observed tunability in the magnetic and electronic properties of the doped TiBr₂ monolayers highlights their strong promise as candidate materials for next-generation spintronic and optoelectronic devices.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117725"},"PeriodicalIF":2.6,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144830177","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}
引用次数: 0
The fluorescence sensing and magnetic properties of three coordination polymers based on (imidazo[4,5-b]pyridin-2-yl)benzoic acid 基于(咪唑[4,5-b]吡啶-2-基)苯甲酸的三种配位聚合物的荧光传感和磁性能
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-08 DOI: 10.1016/j.poly.2025.117727
Chao-Shen Han , Fu-Long Ma , Lan Ma , Hao Zhang , Xin-Fang Wang , Lu-Lu Wang , Duo-Zhi Wang
{"title":"The fluorescence sensing and magnetic properties of three coordination polymers based on (imidazo[4,5-b]pyridin-2-yl)benzoic acid","authors":"Chao-Shen Han ,&nbsp;Fu-Long Ma ,&nbsp;Lan Ma ,&nbsp;Hao Zhang ,&nbsp;Xin-Fang Wang ,&nbsp;Lu-Lu Wang ,&nbsp;Duo-Zhi Wang","doi":"10.1016/j.poly.2025.117727","DOIUrl":"10.1016/j.poly.2025.117727","url":null,"abstract":"<div><div>Three new coordination polymers (CPs), {[M(<strong>L</strong>)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·2H<sub>2</sub>O}<sub>n</sub> [M = Cd (<strong>1</strong>), Ni (<strong>2</strong>)] {[Cu(H<strong>L</strong>)<sub>2</sub>(H<sub>2</sub>O)(SO<sub>4</sub>)]}<sub>n</sub> (<strong>3</strong>) (H<strong>L =</strong> 4-(3<em>H</em>-imidazo[4,5-<em>b</em>]pyridin-2-yl)benzoic acid) were synthesized and characterized. Interestingly, the fluorescence sensing investigations suggested that <strong>1</strong> could be considered as a multifunctional fluorescence sensor for Ag<sup>+</sup> and Fe<sup>3+</sup> via a fluorescence quenching effect with high selectivity, sensitivity and good reusability, the detection limits were 0.2839 μM and 0.307 μM, respectively. Furthermore, the fluorescence quenching mechanism reveals that the energy-competition absorption and weak interaction play a synergistic role in the fluorescence quenching of <strong>1</strong> for Ag<sup>+</sup> and Fe<sup>3+</sup>. In addition, magnetic characterization revealed that antiferromagnetic exchange interactions existed between adjacent metal nodes in <strong>2</strong> and <strong>3</strong>.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117727"},"PeriodicalIF":2.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144830174","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}
引用次数: 0
Effect of Y and Mn on structural, morphological, optical, magnetic properties, photocatalytic and biological activity of cobalt Nano ferrites by citrate gel auto combustion method Y和Mn对柠檬酸凝胶自燃烧法制备钴纳米铁氧体的结构、形态、光学、磁性、光催化和生物活性的影响
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-08 DOI: 10.1016/j.poly.2025.117726
Suryam Neeradi, Laxma Reddy Kotha
{"title":"Effect of Y and Mn on structural, morphological, optical, magnetic properties, photocatalytic and biological activity of cobalt Nano ferrites by citrate gel auto combustion method","authors":"Suryam Neeradi,&nbsp;Laxma Reddy Kotha","doi":"10.1016/j.poly.2025.117726","DOIUrl":"10.1016/j.poly.2025.117726","url":null,"abstract":"<div><div>Nanostructured ferrites with the formula Co<sub>1-y</sub>Mn<sub>y</sub>Y<sub>x</sub>Fe<sub>2-x</sub>O<sub>4</sub> x = 0.0, 0.02, 0.04, 0.06, 0.08, and 0.1 were synthesized using the citrate gel method to investigate their structural, optical, magnetic properties, photocatalytic, and antimicrobial activity. X-ray diffraction (XRD) confirmed a cubic spinel structure with crystallite sizes ranging from 18 to 34 nm, while scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) revealed granular morphology and elemental composition. Fourier-transform infrared (FTIR) and Raman spectroscopy characterized the molecular vibrations and confirming spinel structure formation. Vibrating Sample Magnetometry (VSM) showed that magnetic parameters such as saturation magnetization and coercivity varied with doping concentrations, indicating significant changes in magnetic anisotropy. The photocatalytic activity of these ferrites was tested using methylene blue and Acid Red dyes, with YMN-5 (Co<sub>0.9</sub>Mn<sub>0.04</sub>Y<sub>0.04</sub>Fe<sub>1.9</sub>O<sub>4</sub>) exhibiting the highest degradation efficiency. Furthermore, the antibacterial and antifungal activities against various pathogens demonstrated enhanced efficacy with optimized doping. Samples exhibited tunable optical properties with increasing Y<sup>3+</sup> content (x = 0.0–0.1). A decreasing cut-off wavelength (553–526 nm) and increasing direct (2.15–2.52 eV) and indirect (2.20–2.60 eV) band gaps were observed, indicating enhanced photon absorption. Urbach energy (0.82–1.20 eV) increased linearly, suggesting structural disorder. Photoluminescence spectra revealed UV–visible transitions and recombination behaviour influenced by Y-doping, with intensity variations attributed to defect states and concentration quenching.</div><div>These findings highlight the potential of Y-doped Mn<img>Co ferrites in environmental remediation and biomedical application.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117726"},"PeriodicalIF":2.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144841616","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}
引用次数: 0
Iridium(III) salen complexes with a formal tetradentate coordination: Synthesis, structure and photophysical properties 具有正式四齿配位的铱(III) salen配合物:合成、结构和光物理性质
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-08 DOI: 10.1016/j.poly.2025.117717
Daqing Chen, Chenghui Han
{"title":"Iridium(III) salen complexes with a formal tetradentate coordination: Synthesis, structure and photophysical properties","authors":"Daqing Chen,&nbsp;Chenghui Han","doi":"10.1016/j.poly.2025.117717","DOIUrl":"10.1016/j.poly.2025.117717","url":null,"abstract":"<div><div>[Ir(<em>Cod</em>)Cl]<sub>2</sub> reacts with salen ligand L<sub>1</sub> to give a <em>trans</em> iridium complex [Ir<sup>III</sup>(salenL<sub>1</sub>)Cl(CO)]<strong>(1)</strong>. Subsequent ligand substitution reactions of complex <strong>1</strong> with various ancillary ligands enabled the synthesis of a novel series of neutral Ir(III) complexes bearing diverse axial ligands. Complexes [Ir<sup>III</sup>(salenL<sub>1</sub>)Cl(2,6-dimethylphenyl-isocyanide)] (<strong>2</strong>), [Ir<sup>III</sup>(salenL<sub>1</sub>)(2,6-dimethylphenyl-isocyanide)(4-methylphenylacetylide)] (<strong>4</strong>) and [Ir<sup>III</sup>(salenL<sub>1</sub>) (2-naphthyl-isocyanide)(4-methylphenylacetylide)] (<strong>5</strong>) are emissive in degassed dichloromethane. The axial ligands were found to play a pivotal role in the photophysical and electronic properties of these Ir(III) complexes, as elucidated through a combination of spectroscopic studies and theoretical calculations.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"281 ","pages":"Article 117717"},"PeriodicalIF":2.6,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144809432","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}
引用次数: 0
Synthesis of new nanocomposite based on Keggin-type heteropolyanion and metal-organic framework (MOF) as a new and effective nanocatalyst in removing environmental pollutants 基于keggin型杂多阴离子和金属有机骨架(MOF)的新型纳米复合材料的合成,作为一种新型有效的纳米催化剂去除环境污染物
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-08-07 DOI: 10.1016/j.poly.2025.117724
Mohammad Ali Rezvani , Seyyed Amirreza Mousavi , Zahra Rafiei , Amirhossein Hemmatzadeh
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