Polyhedron最新文献

{"title":"f-Element complexes with benzyl and cyclohexyl substituted trihydroborates","authors":"Joshua C. Zgrabik,&nbsp;Peter A. Zacher III,&nbsp;Scott R. Daly","doi":"10.1016/j.poly.2025.117408","DOIUrl":"10.1016/j.poly.2025.117408","url":null,"abstract":"<div><div>Actinide complexes containing the simplest borohydrides (BH₄)¹⁻ and (MeBH₃)¹⁻ can exhibit remarkably highly volatility, which creates unique hazards and handling challenges, especially when making measurements on solid samples under vacuum. Here we describe efforts to prepare new actinide borohydride complexes with attenuated volatility by adding bulkier benzyl (Bn) and cyclohexyl (Cy) substituents to boron. Reactions of ThCl₄, UI₃(thf)₄, and NdI₃ with the mixed alkali metal salt Li/K(BnBH₃)(thf)_n yielded Th(BnBH₃)₄(thf)₂, U(BnBH₃)₄(thf)₂, and K[Nd(BnBH₃)₄], respectively. Notable amongst these, the reaction with UI₃(thf)₄ proceeds via oxidation of U(III) to U(IV) despite the presence of reducing borohydride ligands. Similarly, reactions of the same metal halides with four equivalents of Li(CyBH₃)(Et₂O)_n yielded Th(CyBH₃)₄, U(CyBH₃)₄(thf)₂, and [Li(Et₂O)₃][Nd(CyBH₃)₄]. Single crystal X-ray diffraction studies of the M(BnBH₃)₄(thf)₂ complexes with M = Th and U confirmed their formulations. The complexes have approximate D_2d point group symmetry and adopt bicapped hexagonal antiprismatic coordination geometries with axial thf ligands and κ³-BnBH₃ ligands bound in the equatorial plane. K[Nd(BnBH₃)₄] and [Li(Et₂O)₃][Nd(CyBH₃)₄], which were prepared for comparison to U(III) complexes that were unsuccessfully targeted, were also structurally characterized to reveal complex anions with tetrahedral arrangements of trihydroborate ligands bound to Nd(III). Crystals obtained for Th(CyBH₃)₄ and U(CyBH₃)₄(thf)₂ were not suitable for XRD studies, but ¹H and ¹¹B NMR spectra were consistent with their formulations. Collectively, these complexes represent rare examples of structurally characterized f-element trihydroborate complexes with carbon substituents other than methyl.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117408"},"PeriodicalIF":2.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148715","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":"The synthesis, structure and solution and gas phase properties of complexes of scandium and lanthanide triflates with the phosphine oxide ligands PhP(O)(C2H4P(O)Ph2)2 and P(O)(C2H4P(O)Ph2)3","authors":"Simon J. Coles ,&nbsp;Ann P. Hunter ,&nbsp;Sarah J. Fieldhouse ,&nbsp;Anthony M.J. Lees ,&nbsp;Laura J. McCormick McPherson ,&nbsp;Andrew W.G. Platt","doi":"10.1016/j.poly.2025.117395","DOIUrl":"10.1016/j.poly.2025.117395","url":null,"abstract":"<div><div>The synthesis and structures of complexes of PhP(O)(C₂H₄P(O)Ph₂)_2, L¹, and P(O)(C₂H₄P(O)Ph₂)₃, L², respectively, with scandium and lanthanide triflates are described. Single crystal x-ray structures of complexes of the octahedral [Sc(L¹)₃](OTf)₃, dodecahedral [Nd(OTf)(H₂O)(L¹)₂](OTf)₂ and [Ln(OTf)(H₂O)(L²)₂](OTf)₂ (Ln = La, Gd), and the dimeric [{Er(OTf)₂(H₂O)(μ–L²)}₂](OTf)₂ and [{Er(OTf)₂(EtOH)(μ–L²)}₂](OTf)₂, which have distorted pentagonal bipyramidal geometry around Er, have been determined. The solution properties of the complexes have been investigated by ¹⁹F and ³¹P NMR spectroscopy which show that the complexes of L¹ are fluxional with exchange of inequivalent coordinated Ph₂PO groups in solution. Complexes of L² show the same process and exchange between coordinated and pendant arms of the ligand. The stability in the gas phase has been investigated by electrospray mass spectrometry (ESMS) and tandem ESMS where, in addition to loss of triflate, L¹ and L², loss of diphenylphosphine oxide and Ph₂P(O)C₂H₄OSO₂CF₃ are shown to be significant decomposition pathways for complexes of both ligands. A brief study of the catalytic properties of a range of complexes shows that the alkenylation of 1,4-dimethoxybenzene with phenylacetylene in nitromethane does not occur at 80 °C for complexes of L¹ or L².</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117395"},"PeriodicalIF":2.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148717","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}

{"title":"A novel dimeric copper(II) complex derived from a Schiff base ligand: Structural insights and antibacterial potential","authors":"Hamid Zeighami Nejad ,&nbsp;S. Yousef Ebrahimipour ,&nbsp;S. Jamilaldin Fatemi ,&nbsp;Hadi Ebrahimnejad ,&nbsp;Jesus Castro","doi":"10.1016/j.poly.2025.117391","DOIUrl":"10.1016/j.poly.2025.117391","url":null,"abstract":"<div><div>A novel copper(II) complex, [Cu(L)(py)], was synthesized utilizing the Schiff base ligand 3-((2-hydroxyphenyl)amino)-1-phenylbut-2-en-1-one-2-ylidene)phenol (HL). The ligand was prepared through the condensation reaction of benzoylacetone and 2-aminophenol. The subsequent copper(II) complex was obtained by reacting the ligand with copper(II) acetate in the presence of pyridine. The structures of the ligand and complex were elucidated by elemental analysis, FT-IR, ¹H NMR spectroscopy, and single-crystal X-ray diffraction. The complex crystallizes in the triclinic system, space group <em>P</em>-1, with two independent molecules within the asymmetric unit. The copper(II) ion adopts a square pyramidal geometry, coordinated by the azomethine nitrogen, two phenolic oxygen atoms, and a pyridine molecule. The Cu<img>Cu distance within the dimeric complex is 3.1646(9) Å. The antibacterial activity of the synthesized complex was assessed against four bacterial strains: <em>Staphylococcus aureus</em>, <em>Bacillus cereus</em>, <em>Escherichia coli</em>, and <em>Salmonella Typhimurium</em>. The minimum inhibitory concentration (MIC) values were determined using the broth dilution method. The complex displayed moderate antibacterial activity against all tested strains, with MIC values ranging from 16 to 32 μM.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117391"},"PeriodicalIF":2.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147324","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":"Synthesis and characterization of olivine phosphate LiMPO4, M = Co(II), Ni(II) nanostructures in the solid state","authors":"Abolghasem Kazeminasab ,&nbsp;Seyed Abolghasem Kahani ,&nbsp;Armen Avanes","doi":"10.1016/j.poly.2025.117399","DOIUrl":"10.1016/j.poly.2025.117399","url":null,"abstract":"<div><div>Olivine phosphate as a most important family of cathode was showed high rechargeable capacity. In this paper, a mechanochemical method for synthesis of olivine nanostructures was presented. The compounds such as LiCoPO₄ (LCP) and LiNiPO₄ (LNP) were synthesized by solid state reaction. NH₄CoPO₄ (ACP) and NH₄NiPO₄ (ACP) as precursors were prepared in an aqueous solution. Mechanochemical reaction between precursors and Li₂CO₃ reaction occurred at room temperature. The chemical changes of LCP and LNP compounds were characterized by Fourier transform infrared spectroscopy (FT-IR), X-Ray Diffraction (XRD) analysis, and also morphological changes by Scanning Electron Microscopy (SEM), Energy Dispersion X-ray (EDX) analysis and surface analysis Brunauer-Emmett-Teller (BET). Quantitative analysis of LNP showed pure LiNiPO₄, although LCP contained both LiCoPO₄ 76.3 at% and Co₃O₄ 23.7 at% phases. Results showed that the original products of the mechanochemical reaction have an amorphous phase, which crystallized after annealing. FTIR spectra showed that NH₄⁺ ions were replaced with Li⁺ ions. The SEM images of LCP and LNP show nanoparticles that have squamous morphologies with well-defined grain boundaries and uniform distribution. The particle size distributions were found to range from 15 to 80 nm and 62–237 nm for LCP and LNP respectively. The BET analysis of LiCoPO₄ with Type III isotherm shows the surface area 3.3234 m²/g, total pore volume 0.013424 cm³/g and also, the average size of the porous 16.157 nm. Although, BET analysis diagram of LiNiPO₄ shows Type IV isotherm with mesopores structure that has surface area 7.4696 m²/g, total pore volume 0.08079 and also, the average size of the porous 43.263 nm. The cyclic voltammetry data showed a higher specific capacitance, 346.18 Fg⁻¹ in LCP, whereas LNP has 307.69 Fg⁻¹.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117399"},"PeriodicalIF":2.4,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148712","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":"An overview of porphyrin-based catalysts for sulfide oxidation reactions","authors":"Sara Payamifar ,&nbsp;Majid Abdouss ,&nbsp;Ahmad Poursattar Marjani","doi":"10.1016/j.poly.2025.117389","DOIUrl":"10.1016/j.poly.2025.117389","url":null,"abstract":"<div><div>Oxidation is well known as a vital transformation reaction employed in the organic synthesis field for creating useful oxidation products. Regarding environmental problems, great efforts were concentrated on using the properties of green chemistry in catalytic reactions. Developing a green, eco-friendly, and economical method for efficient and selective oxidation of different organic materials is critical. Since sulfoxides are significant compounds in organic synthesis and biological systems, the selective oxidation of sulfides into sulfoxides is necessary for organic synthesis. Sulfoxides are synthetic intermediates that are used to make a variety of chemically and biologically active compounds. Developing new strategies and green catalysts for the selective oxidation of sulfides to sulfoxides has interested some research groups worldwide. Porphyrins (Por) are well-known as macromolecular heterocyclic material created from four pyrroles attached by a methylene bridge and have highly hopeful electrochemical and optical catalytic features. Porphyrin-based catalysis often requires mild reaction conditions and can use environmentally friendly oxidants like O₂ or hydrogen peroxide. This aligns with green chemistry principles by reducing the need for harsh chemicals and generating fewer by-products. These attributes make porphyrins and their derivatives invaluable in sulfide oxidation reactions across academic, pharmaceutical, and industrial applications. Hence, many investigations have concentrated on porphyrin compounds in electrochemical catalysis and photo electrocatalysis, mostly in the catalytic oxidation reaction. Porphyrin-based catalysts were vastly employed as efficient catalysts in this transformation due to their non-toxicity, powerful catalytic ability, and unique characteristics. Utilizing a porphyrin-based catalyst to oxidize sulfides into sulfoxides selectively can make the procedure more efficient, selective, and eco-friendly than prior methods. Different types of catalysts based on porphyrin-based homogeneous catalysts, porphyrin-based heterogeneous catalysts, and porphyrin-based photocatalysts have been studied here. The specific goal of this review is to highlight the application of porphyrin-based catalyst systems in the oxidation of sulfides from 2014 to 2024.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117389"},"PeriodicalIF":2.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148711","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":"Structural, photosensitive and radiation shielding characteristics of tungsten alkali borate glasses for photonic and radiation shielding applications","authors":"G. Dedeepya ,&nbsp;Sk. Mahamuda ,&nbsp;P. Sailaja ,&nbsp;K. Swapna ,&nbsp;M. Venkateswarlu ,&nbsp;A.S. Rao","doi":"10.1016/j.poly.2025.117396","DOIUrl":"10.1016/j.poly.2025.117396","url":null,"abstract":"<div><div>Dy³⁺ ions doped Tungsten Alkali Borate (TAB) glasses were synthesized by conventional melt-quench technique and characterized for photonic device and radiation shielding applications. The structural analysis was done through XRD and FT-IR measurements. From the FT-IR spectra, the OH content present in the as prepared glass samples has been estimated and it is relatively low compared with other glasses. The Judd-Ofelt (J-O) theory was utilised to validate the experimental results and to evaluate the radiative parameters of the glasses. The effect of local ligand field environment around Dy³⁺ ions has also been understood from J-O intensity parameters. In the photoluminescence (PL) spectra, three emissions in bluish (⁴F_9/2 → ⁶H_15/2), yellowish (⁴F_9/2 → ⁶H_13/2) and reddish (⁴F_9/2 → ⁶H_11/2) regions were observed. A range of radiative properties along with CIE co-ordinates were measured to identify the optimum glass suitable for solid state device applications. Number of radiations shielding parameters were calculated to know the appropriate glass for x-ray and gamma rays shielding applications.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117396"},"PeriodicalIF":2.4,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148561","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":"Dy3+ ion-doped lithium nickel nanoparticles: Preparation and investigation of nanomagnetic ferrite for antimicrobial applications","authors":"Yogesh Shankar More,&nbsp;Arati Chandragupta Mehere,&nbsp;Nilesh U. Chaudhari,&nbsp;Satish V. Gaikwad,&nbsp;Mansi S. Rathod,&nbsp;Vinod N. Dhage,&nbsp;P.R. Dusane,&nbsp;Sopan M. Rathod","doi":"10.1016/j.poly.2025.117397","DOIUrl":"10.1016/j.poly.2025.117397","url":null,"abstract":"<div><div>This study investigates the impact of Dy³⁺ doping in Lithium-Nickel ferrite. Nanoparticles of Dy³⁺ doped Lithium-Nickel ferrite (Li_1.8Ni_0.1Dy_yFe_2-yO₄) with varying concentrations (y = 0.025, 0.05, 0.075, 0.1, 0.125) have been successfully synthesized using the Sol-Gel auto-combustion technique. Li_1.8Ni_0.1Dy_yFe_2-yO₄ ferrite crystallizes in a spinel cubic structure, although the presence of secondary phases is observed. Various characterization tools, including X-ray diffraction for phase investigation, Vibrating sample magnetometry for magnetic properties, Fourier Transform Infrared Spectroscopy for structural analysis, and Ultraviolet–visible spectroscopy for absorption bands, have been employed in this study. The analysis of X-ray diffraction data reveals that the crystallite size falls within the range of 32.79–11.13 nm. Notably the crystallite size determined using both the Debye-Scherrer formula and the Williamson and Hall plot is in close agreement. The Fourier Transform Infrared Spectroscopy pattern of the synthesized ferrite elucidates the asymmetric stretching mode of the spinel transition in Li_1.8Ni_0.1Dy_yFe_2-yO₄. Additionally, the saturation magnetization for Li_1.8Ni_0.1Dy_yFe_2-yO₄ ranges from 13.7778 to 25.5333 emu/gm. The UV–visible spectra analysis reveals decreased optical band gap energy of Lithium-Nickel ferrites after Dy³⁺ doping. Subsequently, the synthesized nanoparticles demonstrate promising antibacterial and antifungal activity, yielding positive results in the conducted tests.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117397"},"PeriodicalIF":2.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147328","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":"Synthesis and structure elucidation of tailored metal-based intercalative agents derived from anthraldehyde & L-valine that show selective inhibition against triple-negative resistant breast cancer cells","authors":"Salman Khan,&nbsp;Mohd. Tauqeer,&nbsp;Farukh Arjmand,&nbsp;Sartaj Tabassum","doi":"10.1016/j.poly.2025.117398","DOIUrl":"10.1016/j.poly.2025.117398","url":null,"abstract":"<div><div>A series of tailored metal-based drug candidates having the formulation [M(L)₂(bpy)] where ‘L’ represents the Schiff base ligand derived from a condensation reaction of anthraldehyde &amp; L-valine, bpy = 2,2′-bipyridine and M = Co(II), Ni(II) &amp; Zn(II) <strong>1</strong>–<strong>3,</strong> respectively, were prepared and thoroughly characterized by spectroscopic techniques and single crystal X-ray diffraction (in case of <strong>1</strong> and <strong>2</strong>) studies. The anticancer therapeutic potency of <strong>1</strong>–<strong>3</strong> was evaluated by performing interaction studies with therapeutic targets, ct-DNA/tRNA by complementary spectroscopic {absorption, fluorescence titrations and circular dichroism} methods, cleavage activity with pBR322 plasmid DNA, and cytotoxic activity against resistant {MDA-MB-231, HeLa, MIA-PA-CA-2, &amp; Hep-G2} cancer cells. The corroborative results of these experiments revealed i) strong intercalative binding mode with ct-DNA in the order Co(II) &gt; Ni(II) &gt; Zn(II) as determined by their binding constant and intrinsic <strong><em>K</em>_b</strong> and <strong><em>K</em>_sv</strong> values in the order as follows; 2.28 × 10⁴ &gt; 2.03 × 10⁴ &gt; 1.55 × 10⁴ (M⁻¹) and 4.45 × 10⁴ &gt; 3.84 × 10⁴ &gt; 2.93 × 10⁴ (M⁻¹), respectively, ii) efficient cleavage activity at the concentration of 1 <span><math><mrow><mi>μ</mi></mrow></math></span>M, and 3 <span><math><mrow><mi>μ</mi></mrow></math></span>M mediated by oxidative pathway in <strong>1</strong> and hydrolytic pathway in <strong>2</strong> and <strong>3,</strong> iii) remarkably good therapeutic potency against tested cancer cells with GI₅₀ &lt; 8 <span><math><mrow><mi>μ</mi></mrow></math></span>M, exhibiting preferential selectivity against triple-negative resistant breast cancer cell line MDA-MB-231.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117398"},"PeriodicalIF":2.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148562","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":"Copper(II) complexes with N,O-donor azo-Schiff base ligands: Synthesis, structure, DFT studies, molecular docking, anticancer and antimicrobial activity","authors":"Sevgi Kahraman ,&nbsp;Ceylan Hepokur ,&nbsp;Fatih Erci ,&nbsp;Sultan Erkan ,&nbsp;Seda Cetin ,&nbsp;Muhammet Kose ,&nbsp;Mukerrem Kurtoglu","doi":"10.1016/j.poly.2025.117393","DOIUrl":"10.1016/j.poly.2025.117393","url":null,"abstract":"<div><div>Two Schiff base ligands containing 4-(fluoro or bromo)phenylazo group <strong>2</strong>, <strong>3</strong> and their Cu(II) complexes <strong>4</strong> and <strong>5</strong> were prepared, and their structures were characterized by analytical, spectral and computational methods. The crystal structures of the ligands <strong>2</strong>, <strong>3</strong> and their Cu(II) complexes <strong>4</strong> and <strong>5</strong> were determined by single crystal XRD studies. The XRD data revealed that both ligands <strong>2</strong> and <strong>3</strong> are in phenol-imine tautomeric state in the crystalline form. In the structures of Cu(II) complexes <strong>4</strong> and <strong>5</strong>, each Cu(II) is four coordinated binding to NO (imine nitrogen and donor set of two azo-Schiff base ligands with approximately square plane geometry. The elemental analysis data reveal that the azo-Schiff base Cu(II) complexes have 1:2 (M: L) stoichiometry. The electronic absorption spectra and quantum chemical calculations suggest a distorted square planer geometry for the complexes. Antibacterial activities of the azo-Schiff bases and their Cu(II) complexes were screened against of <em>Bacillus cereus</em> and <em>Staphylococcus aureus</em>, <em>Escherichia coli</em> and <em>Salmonella typhimurium</em>. The antitumor activity of the has been investigated across different cancer cell lines, including human breast cancer (MCF-7, MDA-MB-231), human colon colorectal adenocarcinoma (HT-29), rat glioma (C6), human Gastric Adenocarcinoma (AGS) and cisplatin was used as the standard drug. The antiproliferative efficacy of compound <strong>5</strong> was assessed through flow cytometry and annexin-V analysis, while the metabolic pathway active in breast cancer cells was scrutinized to understand its mechanism of action. The cytotoxic effects of synthesized ligands and their Cu(II) complexes were evaluated on multiple cancer cell lines, revealing that Cu(II) complex 5 had the highest potency against MDA-MB-231 cells with an IC₅₀ value of 4.45 µg/mL, demonstrating significant selectivity for cancer cells over healthy cells, and indicating its potential as an effective therapeutic agent in cancer treatment, particularly as it induced cell death while minimally affecting healthy cells. Furthermore, in silico studies were conducted to evaluate the antibacterial and anticancer properties of compounds <strong>1</strong>–<strong>5</strong>. The findings revealed that compound 5 exhibited the highest antibacterial activity against <em>S. aureus</em> and <em>B. cereus</em>, as well as significant cytotoxic effects on breast cancer cells. All in all, two Schiff base ligands containing 4-(fluoro or bromo)phenylazo group <strong>2</strong>, <strong>3</strong> and their Cu(II) complexes <strong>4</strong>, <strong>5</strong> hold promise as prospective candidates for the development of novel anticancer drugs.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117393"},"PeriodicalIF":2.4,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143147327","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":"Investigation of azobenzene-functionalized (2-phenylpyridine)Pt(II) complexes as switchable luminescent probes for amyloid fibrils","authors":"Zhuoheng Li,&nbsp;F. Christopher Pigge","doi":"10.1016/j.poly.2025.117394","DOIUrl":"10.1016/j.poly.2025.117394","url":null,"abstract":"<div><div>Two new cyclometalated platinum(II) acetylacetone (acac) complexes have been prepared and characterized. Each complex features a 2-phenylpyridine (ppy) cyclometalating ligand substituted with a peripheral photoswitchable azobenzene group. Azobenzene <em>trans</em> to <em>cis</em> photoisomerization and thermally-induced <em>cis</em> to <em>trans</em> back-isomerization were examined using UV–visible and ¹H NMR spectroscopy. Solutions of both complexes were found to be non-luminescent when irradiated at 410 nm in various solvents of differing polarity. A turn-on emission response was observed, however, when the complex possessing a ppy ligand functionalized with an azobenzene unit via an amide linkage was treated with amyloid fibrils prepared from denaturation of hen egg-white lysozyme (HEWL). The emission response is ascribed to steric inhibition of azobenzene photoisomerization upon interaction of the complex with hydrophobic surfaces of HEWL fibrils. X-ray crystal structures of four new Pt(II) complexes are reported as well.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"269 ","pages":"Article 117394"},"PeriodicalIF":2.4,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143148632","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}