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Synthesis of zirconia and HPA based catalyst system with high acidity for n-hexane isomerization 正己烷异构化高酸性氧化锆和HPA催化剂体系的合成
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-30 DOI: 10.1016/j.poly.2025.117810
Amit Kumar , Priyanka , Mayora Varshney , Bhavtosh Sharma
{"title":"Synthesis of zirconia and HPA based catalyst system with high acidity for n-hexane isomerization","authors":"Amit Kumar ,&nbsp;Priyanka ,&nbsp;Mayora Varshney ,&nbsp;Bhavtosh Sharma","doi":"10.1016/j.poly.2025.117810","DOIUrl":"10.1016/j.poly.2025.117810","url":null,"abstract":"<div><div>Nanosized crystalline sulphated zirconia solid acid catalysts were synthesized via a precipitation route and thoroughly characterized using scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), FTIR, NH<sub>3</sub>-TPD, H<sub>2</sub>-TPR, TGA, and N<sub>2</sub> adsorption/desorption isotherm at 77 K. Optical properties were evaluated through UV–Vis absorption and fluorescence spectroscopy. These solid acid catalysts exhibited high surface areas (156–68 m<sup>2</sup>/g) and pore volumes (0.13–0.41 cm<sup>3</sup>/g). Sulphation was achieved using 0.5 M H<sub>2</sub>SO<sub>4</sub>, followed by impregnation of tungstophosphoric acid (TPA) onto the catalysts with loadings ranging from 10 to 60 wt%. This two-step modification enhanced the total acidity of the catalysts to 0.11–0.67 mmol/g. PXRD analysis confirmed the predominance of the monoclinic zirconia phase. Catalytic performance was evaluated for n-hexane isomerization in a fixed-bed microreactor over 150–250 °C. The maximum conversion (45 %) was achieved under optimal conditions of 225 °C and WHSV = 1.25 h<sup>−1</sup>.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117810"},"PeriodicalIF":2.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266923","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 determination of mesoporous crystals by transmission electron microscopy 透射电镜法测定介孔晶体结构
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-30 DOI: 10.1016/j.poly.2025.117811
Lu Han , Yanhang Ma , Xueliang Zhang , Nobuhisa Fujita , Chuanbo Gao , Keiichi Miyasaka , Shunai Che , Osamu Terasaki
{"title":"Structure determination of mesoporous crystals by transmission electron microscopy","authors":"Lu Han ,&nbsp;Yanhang Ma ,&nbsp;Xueliang Zhang ,&nbsp;Nobuhisa Fujita ,&nbsp;Chuanbo Gao ,&nbsp;Keiichi Miyasaka ,&nbsp;Shunai Che ,&nbsp;Osamu Terasaki","doi":"10.1016/j.poly.2025.117811","DOIUrl":"10.1016/j.poly.2025.117811","url":null,"abstract":"<div><div>Understanding the complex structural features of mesoporous crystals is essential for unraveling their formation mechanisms, understanding structural relationships, and optimizing functionalities. Electron crystallography, using transmission electron microscopy (TEM), has emerged as a primary tool in determining these structures. This review highlights recent advances and underlying principles of state-of-the-art TEM techniques used in this field. It explores the development of structural solution methods and provides an in-depth summary of mesoporous crystal architectures, including cage-type, cylindrical-type, and hyperbolic surface-type structures. By addressing these aspects, the review offers valuable insights into enhancing our understanding and expanding applications of mesoporous crystals.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117811"},"PeriodicalIF":2.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266934","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
Hydrogen-bonded supramolecular assembly of two lanthanide complexes: Crystal structures, spectroscopy, thermal behavior, and luminescence properties 两种镧系配合物的氢键超分子组装:晶体结构、光谱、热行为和发光性质
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-27 DOI: 10.1016/j.poly.2025.117805
Zi-Yi Qu , Jin-Jin Zhao , Ning Ren , Jian-Jun Zhang
{"title":"Hydrogen-bonded supramolecular assembly of two lanthanide complexes: Crystal structures, spectroscopy, thermal behavior, and luminescence properties","authors":"Zi-Yi Qu ,&nbsp;Jin-Jin Zhao ,&nbsp;Ning Ren ,&nbsp;Jian-Jun Zhang","doi":"10.1016/j.poly.2025.117805","DOIUrl":"10.1016/j.poly.2025.117805","url":null,"abstract":"<div><div>By conventional solvent volatilization method, two mononuclear trivalent lanthanide complexes of the general formula [Ln (4-BrBA)<sub>3</sub>(5,5'-DM-2,2′-bipy)(H<sub>2</sub>O)] (Ln = Tb(1), Dy(2); 4-BrBA = 4-Bromobenzoate, 5,5'-DM-2,2′-bipy =5,5'-Dimethyl-2,2′-bipyridyl)were prepared and structurally characterized. The two complexes were fully characterized, confirming their identity as the target coordination complexes. Determination of molecular configurations for complexes <strong>1</strong> and <strong>2</strong> was achieved via single-crystal X-ray diffraction studies. Crystallographic examination reveals both structures exhibit isomorphous as mononuclear entities, crystallizing in the triclinic crystal system with P-1 space group symmetry. Each building block contains an Ln(III) ion, three 4-Bromobenzoate ligands, one 5,5'-Dimethyl-2,2′-bipyridyl ligands and one H<sub>2</sub>O ligands. The fluorescence spectrum of complexes <strong>1</strong> and <strong>2</strong> were measured. DFT calculations demonstrate that the ligand can effectively transfer energy to the lanthanide ion. The thermal decomposition behavior of complexes <strong>1</strong> and <strong>2</strong> was investigated using coupled TG-DSC/FTIR/MS techniques. The activation energy values (E) at various conversion levels (α) for complex <strong>1</strong> were determined through the M. J. Starink method, yielding the correlation between activation energy and conversion rate. The kinetic model functions corresponding to the third-stage decomposition were identified using the double equal-double steps method.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117805"},"PeriodicalIF":2.6,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220509","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
Mononuclear Co(III) complex: Synthesis, characterization and molecular docking with multiple protein targets, and EGFR inhibition 单核Co(III)配合物:合成、表征和与多个蛋白靶点的分子对接,以及EGFR抑制
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-27 DOI: 10.1016/j.poly.2025.117804
Tufan Singha Mahapatra , Bilash Chandra Roy , Somnath Bej , Biswajit Dey , Akhangsha Paul , Abhishek Choudhury , Ernest Debbarma , Susanta Ghanta
{"title":"Mononuclear Co(III) complex: Synthesis, characterization and molecular docking with multiple protein targets, and EGFR inhibition","authors":"Tufan Singha Mahapatra ,&nbsp;Bilash Chandra Roy ,&nbsp;Somnath Bej ,&nbsp;Biswajit Dey ,&nbsp;Akhangsha Paul ,&nbsp;Abhishek Choudhury ,&nbsp;Ernest Debbarma ,&nbsp;Susanta Ghanta","doi":"10.1016/j.poly.2025.117804","DOIUrl":"10.1016/j.poly.2025.117804","url":null,"abstract":"<div><div>In recent years, Co-complexes have gained significant attention in medicinal chemistry due to their promising biological activities and therapeutic potential. In this study, a mononuclear cobalt(III) complex, [Co(L)<sub>3</sub>] (<strong>1</strong>), was synthesized using a Schiff base ligand and comprehensively characterized by FTIR, UV–Vis spectroscopy, mass spectrometry, X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. The crystallographic analysis confirmed an octahedral coordination environment around the cobalt center, with a meridional arrangement of the three bidentate N, O donor ligands. Structural analysis reveals π–π stacking interactions with centroid-to-centroid distances of 3.748 Å between the aromatic rings of the naphthaldehyde moieties, forming a supramolecular network. Theoretical studies are a crucial initial step in exploring the biological activities of small molecules and complexes, as well as modern drug discovery workflows. Molecular docking studies suggested notable binding affinities of [Co(L)<sub>3</sub>] (<strong>1</strong>) complex with bovine serum albumin (BSA), the <em>Escherichia coli</em> protein, the dengue virus non-structural protein 5 (NS5), and the epidermal growth factor receptor (EGFR) with binding energies of −6.51, −6.65, −6.76, and − 7.49 kcal/mol, respectively. These results suggest that [Co(L)<sub>3</sub>] exhibits strong interactions with proteins associated with diarrhoea, dengue, and pancreatic cancer, indicating its potential as a multi-target therapeutic agent.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117804"},"PeriodicalIF":2.6,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220504","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 power of lanthanides: same composition, but different lanthanides leading to different interesting materials properties, from magnetocalorics to molecular magnets and phosphors 镧系元素的力量:相同的成分,但不同的镧系元素导致不同有趣的材料性质,从磁热学到分子磁体和荧光粉
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-26 DOI: 10.1016/j.poly.2025.117798
Magdalena Wilk-Kozubek , Yaroslav Mudryk , Denis Prodius , Oleksandr Dolotko , Sheikh J. Ahmed , Jacob Overgaard , Volodymyr Smetana , Anja-Verena Mudring
{"title":"The power of lanthanides: same composition, but different lanthanides leading to different interesting materials properties, from magnetocalorics to molecular magnets and phosphors","authors":"Magdalena Wilk-Kozubek ,&nbsp;Yaroslav Mudryk ,&nbsp;Denis Prodius ,&nbsp;Oleksandr Dolotko ,&nbsp;Sheikh J. Ahmed ,&nbsp;Jacob Overgaard ,&nbsp;Volodymyr Smetana ,&nbsp;Anja-Verena Mudring","doi":"10.1016/j.poly.2025.117798","DOIUrl":"10.1016/j.poly.2025.117798","url":null,"abstract":"<div><div>Commonly accepted design concepts for ionic liquids (ILs) state that the constituting ions must be large and carry low, well-dispersed charges. A series of ILs based of pentadeca charged ILs with pentanuclear linear {Ln<sub>5</sub>} units ([Ln<sub>5</sub>(C<sub>2</sub>H<sub>5</sub>-C<sub>3</sub>H<sub>3</sub>N<sub>2</sub>-CH<sub>2</sub>COO)<sub>16</sub>(H<sub>2</sub>O)<sub>8</sub>](Tf<sub>2</sub>N)<sub>15</sub> (C<sub>3</sub>H<sub>3</sub>N<sub>2</sub> = imidazolium moiety, Tf<sub>2</sub>N = bis(trifluoromethanesulfonyl)amide) with Ln = Er, Ho, Tm) demonstrates that these criteria are not absolute. Highly charged ions can also support IL formation, provided they are sufficiently large. Expanding the series of these unconventional, record pentadeca charged with new lanthanide representatives, led to the discovery of additional unprecedented properties for ILs: The Gd compound exhibits a strong magnetocaloric effect (MCE) in the liquid state with a maximum magnetic entropy change of −Δ<em>S</em><sub>M</sub> = −11 J⋅kg<sup>−1</sup>⋅K<sup>−1</sup> at 2 K for Δμ<sub>0</sub><em>H</em> = 7 T. Albeit the Dy representative shows slow magnetic relaxation, the relaxation times are not favorable for practical application as a molecular magnet. Lastly, for both the Gd and the Y compound, phosphorescence in the seconds time scale is observed, which is, to the best of our knowledge, the longest ever reported for an IL.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117798"},"PeriodicalIF":2.6,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220506","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
Efficient degradation and quenching mechanism of ciprofloxacin by bismuth nitrate-derived photocatalysts 硝酸铋衍生光催化剂对环丙沙星的高效降解及猝灭机理研究
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-25 DOI: 10.1016/j.poly.2025.117803
Yu Pan, Xian Liu, Lei Zhu, Qingkang Zhang, Yongfeng He, Xun Wang
{"title":"Efficient degradation and quenching mechanism of ciprofloxacin by bismuth nitrate-derived photocatalysts","authors":"Yu Pan,&nbsp;Xian Liu,&nbsp;Lei Zhu,&nbsp;Qingkang Zhang,&nbsp;Yongfeng He,&nbsp;Xun Wang","doi":"10.1016/j.poly.2025.117803","DOIUrl":"10.1016/j.poly.2025.117803","url":null,"abstract":"<div><div>Our study demonstrates that bismuth nitrate-derived catalysts (BNDs) exhibit pronounced photocatalytic activity toward the degradation of ciprofloxacin (CIP). Through systematic quenching experiments with controlled scavenger concentrations, we elucidate the distinct roles and contributions of each reactive species in the photocatalytic process. Interestingly, suppressing photocatalytic activity concurrently enhanced the adsorption capacity of the catalysts, providing new insights into the synergistic mechanisms between adsorption and photocatalysis. As the calcination temperature increases, Bi(NO₃)₃·5H₂O progressively decomposes into various bismuth nitrate-based compounds. Among these, the BNDs-350 sample achieved a maximum CIP degradation rate of 97.6 % within 30 min at an initial concentration of 40 mg/L. The structural and morphological properties of the synthesized catalysts were comprehensively characterized using X-ray diffraction (XRD) and field-emission scanning electron microscopy (SEM). Furthermore, we investigated the influence of key operational parameters—including initial pH and catalyst loading—on photocatalytic performance. Quenching experiments revealed that superoxide radicals (·O₂<sup>−</sup>), holes (h<sup>+</sup>), and hydroxyl radicals (·OH) all contribute to CIP degradation, with ·O₂<sup>−</sup> and h<sup>+</sup> serving as the primary active species. These findings underscore the potential of bismuth nitrate-derived materials as efficient photocatalysts for environmental remediation and advanced wastewater treatment applications.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117803"},"PeriodicalIF":2.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220507","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 of binuclear complexes of all first row transition metals with a cyclic tetradentate ligand: sandwiches mimicking paddlewheel complexes 具有环四齿配体的所有第一排过渡金属双核配合物的设计:模拟桨轮配合物的三明治
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-25 DOI: 10.1016/j.poly.2025.117791
Salma Sultana , R.H. Duncan Lyngdoh , R. Bruce King
{"title":"Design of binuclear complexes of all first row transition metals with a cyclic tetradentate ligand: sandwiches mimicking paddlewheel complexes","authors":"Salma Sultana ,&nbsp;R.H. Duncan Lyngdoh ,&nbsp;R. Bruce King","doi":"10.1016/j.poly.2025.117791","DOIUrl":"10.1016/j.poly.2025.117791","url":null,"abstract":"<div><div>A series of binuclear sandwich-type complexes M<sub>2</sub>Z<sub>2</sub> of all the first row transition metals [M = Sc to Zn; Z = cyclic N4-tetradentate ligand (C<sub>4</sub>H<sub>6</sub>N<sub>4</sub>)<sup>2−</sup>] is designed to mimic the well-known tetragonal lantern (paddlewheel) complexes with four bidentate ligands. Two orientations of the ligand Z (orthogonal and lateral) are incorporated into the complexes. DFT with the M06-L functional is used to predict the ground states from various low lying spin states. Metal-metal (MM) bonds are assigned formal bond order values from MO analysis and electron counting. The MM bond lengths and ground state spin multiplicities of these M<sub>2</sub>Z<sub>2</sub> complexes are compared with DFT and experimental results on the corresponding paddlewheel complexes. The laterally oriented sandwich M<sub>2</sub>Z<sub>2</sub> complexes are found to mimic the paddlewheel series of complexes with regard to trends across the first row concerning ground state spin multiplicity and MM formal bond order. This owes to conservation of the ligand coordination motif around the metal centres, even though the two types of complexes differ quite distinctly in external structure.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117791"},"PeriodicalIF":2.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220508","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
Reactions of cobalt porphyrin nitrosyl with trimethylphosphine. Low temperature spectroscopic studies in the sublimed solids 亚硝基卟啉钴与三甲基膦的反应。升华固体的低温光谱研究
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-25 DOI: 10.1016/j.poly.2025.117801
Garik Martirosyan, Astghik Hovhannisyan, Lusine Harutyunyan, Hayk Aghekyan
{"title":"Reactions of cobalt porphyrin nitrosyl with trimethylphosphine. Low temperature spectroscopic studies in the sublimed solids","authors":"Garik Martirosyan,&nbsp;Astghik Hovhannisyan,&nbsp;Lusine Harutyunyan,&nbsp;Hayk Aghekyan","doi":"10.1016/j.poly.2025.117801","DOIUrl":"10.1016/j.poly.2025.117801","url":null,"abstract":"<div><div>Reactions of the Co(TTP)(NO) (TTP- meso-tetra-p-tolylporphyrinatocobalt dianion) in the sublimed films with trimethylphosphine (PMe<sub>3</sub>) have been monitored with FTIR and optical spectroscopy at the range from 100 K to room temperature. A new six-coordinate nitrosyl complex of the general formula Co(TTP)(NO)(PMe<sub>3</sub>) is clearly identified at low temperatures. <em>ν</em>(NO) of this compound is lower by 41 cm<sup>−1</sup> than that of a parent Co(TTP)(NO). The downshift of stretching friquencies of coordinated NO is compared with known cobalt porphyrin adducts bearing N- and S-donor ligands. This complex is thermally unstable and can be seen only at low temperatures. DFT calculations were also performed to support experimental results.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117801"},"PeriodicalIF":2.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220679","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
Homologous dinuclear copper compounds with short bridging dicarboxylates. Structural-magnetic correlation 具有短桥接二羧基的同源双核铜化合物。Structural-magnetic相关性
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-24 DOI: 10.1016/j.poly.2025.117802
Bojan Kozlevčar , Andrej Pevec (corresponding author) , Zvonko Jagličić
{"title":"Homologous dinuclear copper compounds with short bridging dicarboxylates. Structural-magnetic correlation","authors":"Bojan Kozlevčar ,&nbsp;Andrej Pevec (corresponding author) ,&nbsp;Zvonko Jagličić","doi":"10.1016/j.poly.2025.117802","DOIUrl":"10.1016/j.poly.2025.117802","url":null,"abstract":"<div><div>Four copper(II) compounds <strong>1</strong>–<strong>4</strong> with three aliphatic α,ω-dicarboxylic acids (HOOC– (CH<sub>2</sub>)<sub>n</sub>–COOH; <em>n</em> = 2–4, H<sub>2</sub>L<sup>1–3</sup>) anions and 2-aminopyridine (L<sup>4</sup>) or 2-amino-5-methylpyridine (L<sup>5</sup>) have been isolated. Three of them show a dinuclear coordination motif [Cu(L<sup>1−2</sup>)(L<sup>4–5</sup>)<sub>2</sub>]<sub>2</sub> <strong>1</strong>–<strong>3</strong>, while one [Cu(L<sup>3</sup>)(L<sup>4</sup>)<sub>2</sub>]<sub>n</sub> <strong>4</strong> reveals a polynuclear structure. A net water molecule is seen in the L<sup>5</sup> compound <strong>2</strong>. The dicarboxylates are coordinated bridging head to tail between the adjacent metal centres. They are forming a distorted coordination square plane CuO<sub>2</sub>N<sub>2</sub> with two aminopyridines. The second carboxylate oxygen atom of each L<sup>1–3</sup> occupies the axial position at significantly longer distance with respect to the equatorial CuO<sub>2</sub>N<sub>2</sub> plane. The 2-amino group of the pyridine-based ligands L<sup>4–5</sup> is enabling an intramolecular H-bond with the axial carboxylate oxygen atom, all in accordance with alike IR spectra of <strong>1</strong>–<strong>4</strong>. Each dicarboxylate thus connects two copper(II) centres. Either as a double bridge in the dinuclear <strong>1</strong>–<strong>3</strong> or enabling a chain in the polymeric <strong>4</strong>. A weak magnetic interaction was found only in dinuclear <strong>1</strong>–<strong>3</strong>. It is related with both carboxylate groups of each dicarboxylate L<sup>1–3</sup> needed for the coordination bridge and the twisted aliphatic moieties of these bridges, which do not support the magnetic coupling between metal centres.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117802"},"PeriodicalIF":2.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220505","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, characterization, and electrooxidation behavior of ruthenium nitrosyl alkyl/aryl-oxides and thiolates with equatorial dicarboxamide chelates 钌亚硝基烷基/芳基氧化物和硫酸盐与赤道二甲酰胺螯合物的合成、表征和电氧化行为
IF 2.6 3区 化学
Polyhedron Pub Date : 2025-09-19 DOI: 10.1016/j.poly.2025.117790
Tsitsi A. Kapfunde , Jennifer Londoño-Salazar , Arulsamy Navamoney , Nobuyuki Yamamoto , Michael J. Shaw , George B. Richter-Addo
{"title":"Synthesis, characterization, and electrooxidation behavior of ruthenium nitrosyl alkyl/aryl-oxides and thiolates with equatorial dicarboxamide chelates","authors":"Tsitsi A. Kapfunde ,&nbsp;Jennifer Londoño-Salazar ,&nbsp;Arulsamy Navamoney ,&nbsp;Nobuyuki Yamamoto ,&nbsp;Michael J. Shaw ,&nbsp;George B. Richter-Addo","doi":"10.1016/j.poly.2025.117790","DOIUrl":"10.1016/j.poly.2025.117790","url":null,"abstract":"<div><div>Ten new ruthenium compounds based on the <em>N,N,N,N</em>-chelate Me<sub>2</sub>bpbMe<sub>2</sub> (bpb = 1,2-bis(pyridine-2-carboximido)benzene) have prepared and characterized by <sup>1</sup>H NMR and IR spectroscopy. The monocarbonyl compound (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(CO)(H<sub>2</sub>O) compound was generated from the reaction of the free base Me<sub>2</sub>bpbMe<sub>2</sub>H<sub>2</sub> with Ru<sub>3</sub>(CO)<sub>12</sub> in refluxing DMF. Isoamyl nitrite reacts with this compound to yield the <em>trans</em>-addition nitrosyl alkoxide (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(O-<em>i</em>-C<sub>5</sub>H<sub>11</sub>). Nitrosothiols similarly add in a formal <em>trans</em>-addition manner to yield (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(SR/Ar) (SR/Ar = S-<em>i</em>-C<sub>5</sub>H<sub>11</sub>, SPh, SC<sub>6</sub>F<sub>4</sub>H, SC(Me)<sub>2</sub>CHNHC(<em>O</em>)Me) derivatives. The (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(O-<em>i</em>-C<sub>5</sub>H<sub>11</sub>) compound undergoes alkoxide exchange reactions with PhOH and HOC<sub>6</sub>F<sub>4</sub>H to generate (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(OPh) and (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(OC<sub>6</sub>F<sub>4</sub>H), respectively. The neutral alkoxide/aryloxide nitrosyl compounds exhibit higher υ<sub>NO</sub> bands (1809–1842 cm<sup>−1</sup>) relative to their thiolate analogues (1755–1823 cm<sup>−1</sup>). The X-ray crystal structures of (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(OPh), (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(OC<sub>6</sub>F<sub>4</sub>H), and (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(SPh), have been determined, and reveal linear axial (O)N–Ru–O/S linkages consistent with trans positioning of the NO and aryloxide and -thiolate groups, and near-linear Ru–N–O moieties (164–174°) consistent with these complexes being formulated as {RuNO}<sup>6</sup> species. The electrooxidation behavior of (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(OC<sub>6</sub>F<sub>4</sub>H), (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(SC<sub>6</sub>F<sub>4</sub>H), and (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(SPh) in CH<sub>2</sub>Cl<sub>2</sub> were examined by cyclic voltammetry and IR spectroelectrochemistry. (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(OC<sub>6</sub>F<sub>4</sub>H) and (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(SC<sub>6</sub>F<sub>4</sub>H) display reversible first oxidations, whereas (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(SPh) displays an irreversible first oxidation with likely loss of the thiolate ligand. Chemical reactivity of (Me<sub>2</sub>bpbMe<sub>2</sub>)Ru(NO)(SPh) with H<sup>+</sup> and Me<sup>+</sup> results in the generation of the free thiol PhSH and thioether PhSMe, respectively.</div></div>","PeriodicalId":20278,"journal":{"name":"Polyhedron","volume":"282 ","pages":"Article 117790"},"PeriodicalIF":2.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266773","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}
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