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Zirconium Complexes Containing [NOON]-Type Ligands for Isoselective Polymerization of rac-Lactide 含[NOON]型配体的锆配合物在消旋丙交酯等选择聚合中的应用
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2026-01-06 DOI: 10.1002/aoc.70502
Wendi Shi, Ying Mu, Zhenlu Wang, Xiaoyue Mu

Several racemic zirconium complexes 1–8 featuring [NOON]-type ligands were synthesized through alkane elimination reactions between Zr(CH2SiMe3)4 and the respective new proligands in toluene. Spectral and elemental analyses were used to characterize these complexes, which demonstrated good performance in rac-lactide polymerization. All complexes displayed comparable catalytic activity, with 5 exhibiting the highest activity (TOF = 58.7 h−1) and 8 yielding polylactide with the highest molecular weight (Mn = 8.6 × 104 g/mol). Notably, these systems outperform existing zirconium complexes bearing [NSSN]-type, [OSSO]-type, and ethylene-bridged [ONSO]-type ligands, as well as phosphasalen Ti/Zr complexes, under analogous polymerization conditions. To enhance the stereoselectivity of these systems, four co-agents—pyridine, 2,2′-bipyridine, DME, and TMEDA—were evaluated. TMEDA was found to significantly improve the stereocontrol of all complexes, with complex 2 showing the highest stereoregularity (Pm = 0.72).

通过Zr(CH2SiMe3)4与甲苯中相应的新前配体的烷烃消去反应,合成了几种具有[NOON]型配体的外消旋锆配合物1-8。用光谱和元素分析对这些配合物进行了表征,证明了它们在rac-丙交酯聚合中具有良好的性能。所有配合物均表现出相当的催化活性,其中5个活性最高(TOF = 58.7 h−1),8个产聚丙交酯的分子量最高(Mn = 8.6 × 104 g/mol)。值得注意的是,在类似的聚合条件下,这些体系的性能优于现有的含[nsn]型、[OSSO]型和乙烯桥接[ONSO]型配体的锆配合物,以及磷酸体Ti/Zr配合物。为了提高这些体系的立体选择性,我们对吡啶、2,2′-联吡啶、二甲醚和tmeda四种助剂进行了评价。TMEDA可显著改善所有配合物的立体控制性,其中配合物2的立体规整性最高(Pm = 0.72)。
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引用次数: 0
Using Density Functional Theory (DFT) Calculations to Reinterpret the Biological Activity of Square Planar Pt (II), Au (III), and Cu (II) Complexes From Molecular Level 利用密度泛函理论(DFT)计算从分子水平重新解释方形平面Pt (II)、Au (III)和Cu (II)配合物的生物活性
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2026-01-06 DOI: 10.1002/aoc.70505
Xin Cheng, Yao-Fei Cui, Xiao-Lin Huang, Yan-Yan Cai, Xu-Jie Gao, Hai-Yan Zhong, Jia-Di Chen, Wei-Ming Sun

The geometric structures and electronic properties of three experimentally reported anticancer Pt (II), Au (III), and Cu (II) complexes (named complexes 1–3) as well as the interactions of these complexes with biological target molecules have been explored in detail by density functional theory (DFT) calculations. Significant differences in the polarity of M-Cl (M = Pt, Au, and Cu) bonds and the nucleophilic reactivity of metal centers were revealed for these complexes. Further research shows that the differences in the hydrolysis and the ligand exchange reactions with biological targets of these complexes are the main reasons for their different antitumor activities. Based on these findings, four novel complexes 4–7 have been rationally designed by replacing the Cu (II) center of 3 with Ni (II), Zn (II), Pd (II), and Fe (II) ions for the first time. Therein, the obtained Zn (II)–centered complex 5 is predicted to exhibit the highest similarity to complex 3. This study not only provides a profound theoretical insight into the activity difference of the reported metal complexes from molecular level but also proposes an effective strategy to design new anticancer drugs.

通过密度泛函理论(DFT)计算,详细探讨了三种实验报道的抗癌配合物Pt (II)、Au (III)和Cu (II)(命名为配合物1-3)的几何结构和电子性质,以及这些配合物与生物靶分子的相互作用。这些配合物的M- cl (M = Pt, Au和Cu)键极性和金属中心的亲核反应性存在显著差异。进一步的研究表明,这些复合物的水解和与生物靶点的配体交换反应的差异是其抗肿瘤活性不同的主要原因。在此基础上,首次用Ni (II)、Zn (II)、Pd (II)和Fe (II)离子取代3的Cu (II)中心,合理设计了4种新型配合物4-7。其中,得到的以Zn (II)为中心的配合物5与配合物3具有最高的相似性。该研究不仅从分子水平上对所报道的金属配合物的活性差异提供了深刻的理论见解,而且为设计新的抗癌药物提供了有效的策略。
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引用次数: 0
Visible-Light-Mediated Hydration of Benzonitriles Catalysed by Silver Nanoparticles on Triazine 纳米银在三嗪上催化苯并腈水化的研究
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2026-01-05 DOI: 10.1002/aoc.70504
Akanksha Rai, Manisha Pandey, Pranshu K. Gupta, Sk. Hussain Basha, Venkatesan Srinivasadesikan, Kalluri V. S. Ranganath

An eco-friendly, visible-light-driven synthesis of benzamides from readily accessible benzonitriles is reported under heterogeneous conditions. A carbon-rich material, such as polyhexahydrotriazine (PHT), graphene oxide (GO), graphitic nitride (g-C3N4)or carbon black, was used as a novel support to stabilise silver nanoparticles (NPs). These silver NPs show remarkable catalytic activity in the hydration of nitriles under visible light irradiation (white light, 9 W). Furthermore, silver NPs stabilised by a triazine moiety exhibit better performance than other supported silver systems, including graphene oxide and carbon black. Their stability and heterogeneous nature as catalysts have been demonstrated through three cycles of recycling in the synthesis of benzamides. This approach utilises mild visible light and a recyclable catalyst that efficiently converts benzonitriles to amides in excellent yields. This work provides a sustainable approach to amide synthesis. Density functional theory (DFT) calculations further indicate that the binding energy of 4-bromobenzonitrile (BCN) to Ag@C3N4 is −31.50 kcal/mol. Further triphenyl phosphine poisoning test confirms the heterogeneous nature of our catalyst under visible light.

报道了一种在非均相条件下由易获得的苯并腈合成的环保、可见光驱动的苯并酰胺。一种富含碳的材料,如聚六氢三嗪(PHT)、氧化石墨烯(GO)、氮化石墨(g-C3N4)或炭黑,被用作稳定银纳米颗粒(NPs)的新型载体。这些银NPs在可见光照射下(白光,9 W)对腈的水化反应表现出显著的催化活性。此外,由三嗪部分稳定的银NPs表现出比其他支撑银系统(包括氧化石墨烯和炭黑)更好的性能。在苯酰胺的合成中,通过三次循环循环,证明了它们作为催化剂的稳定性和多相性。这种方法利用温和的可见光和可回收的催化剂,以优异的产量有效地将苯并腈转化为酰胺。这项工作为酰胺合成提供了一种可持续的方法。密度泛函理论(DFT)进一步计算表明,4-溴苯腈(BCN)与Ag@C3N4的结合能为−31.50 kcal/mol。进一步的三苯基膦中毒试验证实了我们的催化剂在可见光下的多相性。
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引用次数: 0
The Role of Solvents and Hydrogen Bonds in Shaping Spin Crossover Dynamics of Mononuclear Iron (III) Schiff-Base Complexes 溶剂和氢键在形成单核铁(III)席夫碱配合物自旋交叉动力学中的作用
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2026-01-01 DOI: 10.1002/aoc.70500
Hai Zhu, Li-Wen Chen, Hua-Wei Zhou, Hao-Zhe Zhang, Sheng-Ze Zhao, Yong-Hua Li, Shi Wang

A series of FeIII complexes [Fe(5-Br-3-MeO-sal2Trien)]Y·Z (Y = NO3, Z = 0.5CH3OH·CH3CN (1); Y = NO3 (2); Y = ClO4 (3)) have been prepared. Complexes 1 and 2 exhibit analogous crystal packing architectures with two distinct iron centers, labeled Fe1 and Fe2. The Fe1 sites form dimers encapsulated within a hexagonal framework constructed by Fe2 centers. Thermal expansion of the Fe2 framework upon heating creates sufficient space to facilitate the spin transition of Fe1. Both complexes display similar one-step gradual spin crossover behavior, with transition temperatures (Tc) of 142 K for 1 and 186 K for 2, respectively. In contrast, complex 3 incorporates four crystallographically independent Fe centers. Its overly compact packing geometry sterically hinders spin-state switching, resulting a partial low-spin state over the entire tested temperature range.

一系列FeIII配合物[Fe(5-Br-3-MeO-sal2Trien)]Y·Z (Y = NO3−,Z = 0.5CH3OH·CH3CN (1);Y = no3−(2);Y = ClO4−(3))配合物1和2表现出类似的晶体填充结构,具有两个不同的铁中心,标记为Fe1和Fe2。Fe1位点形成二聚体,封装在由Fe2中心构成的六边形框架内。Fe2骨架在受热时的热膨胀为Fe1的自旋跃迁创造了足够的空间。两种配合物均表现出类似的一步渐进自旋交叉行为,转变温度(Tc)分别为142 K和186 K。相反,配合物3包含四个晶体独立的铁中心。其过于紧凑的封装几何结构在空间上阻碍了自旋状态切换,导致在整个测试温度范围内部分低自旋状态。
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引用次数: 0
Green Formulation, Chemical Characterization, Antioxidant, Cytotoxicity, and Anti-Endometrial Cancer Properties of Lobelia chinensis Green-Formulated Iron Nanoparticles by Investigating the P53 and STAT3 Signaling Pathways 通过对P53和STAT3信号通路的研究,半边莲绿色铁纳米颗粒的绿色配方、化学特性、抗氧化、细胞毒性和抗子宫内膜癌特性
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2026-01-01 DOI: 10.1002/aoc.70476
Xue Jiang, Junqing Liu, Senxiang Yan

In this study, we used Lobelia chinensis leaves to describe biogenically supported iron nanoparticles. The leaf of Lobelia chinensis was utilized as an excellent stabilizer for the iron nanoparticles that were synthesized. The as-synthesized Fe NPs@Lobelia chinensis were physicochemically characterized using FE-SEM, FT-IR, XRD, EDX, and UV–Vis. The DPPH technique was used to assess the antioxidant efficacy of nanoparticles. Based on the IC50 value, the antioxidant activity of the Fe NPs@Lobelia chinensis was significant. Because of their antioxidant qualities, recent nanoparticles seem to have an antihuman endometrial carcinoma potential. Fe NPs@Lobelia chinensis that was biologically produced was evaluated for their anti-endometrial cancer properties against endometrial cancer cells. By using the MTT assay, the anti-endometrial cancer characteristics of the Fe NPs@Lobelia chinensis could effectively eliminate HEC-1-B cancer cells. In contrast to their corresponding control, Fe NPs@Lobelia chinensis prevented colony formation. Crucially, the molecular pathway analysis of cells exposed to Fe NPs@Lobelia chinensis revealed that the particles increased the expression of p53 while suppressing the production of phosphorylated and total STAT3 in cells. This suggests that STAT3 and p53 are the primary players behind the medical events that the extract triggered in endometrial carcinoma cells.

在这项研究中,我们用半边莲叶片来描述生物支持铁纳米粒子。以半边莲叶为稳定剂,制备了铁纳米颗粒。利用Fe - sem、FT-IR、XRD、EDX和UV-Vis对合成的中国铁NPs@Lobelia进行了理化表征。采用DPPH技术评价纳米颗粒的抗氧化效果。从IC50值来看,NPs@Lobelia中国铁具有显著的抗氧化活性。由于其抗氧化特性,最近纳米颗粒似乎具有抗人子宫内膜癌的潜力。对生物制备的中国铁NPs@Lobelia对子宫内膜癌细胞的抗子宫内膜癌特性进行了评价。MTT法检测发现,中国铁NPs@Lobelia具有抗子宫内膜癌的特性,能够有效地清除HEC-1-B癌细胞。与相应的对照相比,中国铁NPs@Lobelia抑制了菌落的形成。至关重要的是,暴露于Fe NPs@Lobelia chinensis的细胞的分子通路分析显示,这些颗粒增加了p53的表达,同时抑制了细胞中磷酸化和总STAT3的产生。这表明STAT3和p53是该提取物在子宫内膜癌细胞中引发的医学事件背后的主要参与者。
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引用次数: 0
Anticancer Capacities of Green-Synthesized Zinc Oxide Nanoparticles Loaded With Mangiferin: Mechanistic Insights Into Membrane Damage, pH Change, Oxidative Stress, Apoptosis, and Nuclear Lysis in HepG2 and Caco-2 Cells 含有芒果苷的绿色合成氧化锌纳米颗粒的抗癌能力:对HepG2和Caco-2细胞的膜损伤、pH变化、氧化应激、凋亡和核裂解的机制见解
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2026-01-01 DOI: 10.1002/aoc.70498
Suhuan Mei, Zhi Li, Qiang Wang, Haile Ma, Xiumin Chen

Given the adverse effects of conventional chemotherapeutic agents, natural compounds and biocompatible materials have garnered growing interest in cancer therapy. Our previous research demonstrated that zinc oxide nanoparticles (ZnO NPs), synthesized through an ultrasound-mediated green method using coffee leaves, functioned as effective nanocarriers for the controlled release of mangiferin (MGF). Here, we investigated the anticancer activity of MGF, ZnO NPs, and MGF-loaded ZnO NPs (MGF-ZnO NPs) on HepG2 and Caco-2 cells, along with their underlying anticancer mechanisms. We found that both ZnO NPs and MGF-ZnO NPs significantly reduced cell viability and increased the extracellular to intracellular pH ratio (pHe/pHi) and reactive oxygen species levels in HepG2 and Caco-2 cells. MGF-ZnO NPs further induced notable morphological changes and enhanced cell membrane permeability, chromatin condensation, and nuclear lysis. Additionally, both ZnO NPs and MGF-ZnO NPs increased the overall apoptotic rate in cancer cells, with MGF enhancing the cytotoxic effects of MGF-ZnO NPs. Molecular docking analysis revealed that MGF-ZnO NPs may disrupt cell membrane biogenesis by inhibiting the biological activity of choline/ethanolamine phosphotransferase 1 (CEPT1), an enzyme involved in phospholipid synthesis, through hydrogen bonding and hydrophobic interactions. Additionally, MGF-ZnO NPs also exhibited strong binding affinity to DNA bases through hydrogen bonds (DC15(B) and DG12(A)) and hydrophobic interactions (DC23(B), DG22(B), DA18(B), DA17(B), and others), potentially compromising DNA function. This study suggests that loading ZnO NPs with MGF is a promising approach to enhance cancer therapy and underscores the complex mechanisms involved in nanotherapeutic action.

鉴于传统化疗药物的副作用,天然化合物和生物相容性材料在癌症治疗中获得了越来越多的兴趣。我们的研究表明,利用超声波介导的绿色方法合成的氧化锌纳米颗粒(ZnO NPs)是芒果苷(MGF)控释的有效纳米载体。在这里,我们研究了MGF、ZnO NPs和MGF负载ZnO NPs (MGF-ZnO NPs)对HepG2和Caco-2细胞的抗癌活性,以及它们潜在的抗癌机制。我们发现氧化锌NPs和MGF-ZnO NPs都显著降低了HepG2和Caco-2细胞的细胞活力,增加了细胞外/细胞内pH比(pHe/pHi)和活性氧水平。MGF-ZnO NPs进一步诱导了显著的形态学改变,增强了细胞膜通透性、染色质凝聚和核裂解。此外,氧化锌NPs和MGF-ZnO NPs都增加了癌细胞的总体凋亡率,MGF增强了MGF-ZnO NPs的细胞毒性作用。分子对接分析表明,MGF-ZnO NPs可能通过氢键和疏水相互作用抑制胆碱/乙醇胺磷酸转移酶1 (CEPT1)的生物活性,从而破坏细胞膜的生物发生。此外,MGF-ZnO NPs还通过氢键(DC15(B)和DG12(A))和疏水相互作用(DC23(B), DG22(B), DA18(B), DA17(B)等)与DNA碱基表现出很强的结合亲和力,潜在地损害DNA功能。这项研究表明,MGF负载ZnO NPs是一种很有前景的增强癌症治疗的方法,并强调了纳米治疗作用的复杂机制。
{"title":"Anticancer Capacities of Green-Synthesized Zinc Oxide Nanoparticles Loaded With Mangiferin: Mechanistic Insights Into Membrane Damage, pH Change, Oxidative Stress, Apoptosis, and Nuclear Lysis in HepG2 and Caco-2 Cells","authors":"Suhuan Mei,&nbsp;Zhi Li,&nbsp;Qiang Wang,&nbsp;Haile Ma,&nbsp;Xiumin Chen","doi":"10.1002/aoc.70498","DOIUrl":"https://doi.org/10.1002/aoc.70498","url":null,"abstract":"<div>\u0000 \u0000 <p>Given the adverse effects of conventional chemotherapeutic agents, natural compounds and biocompatible materials have garnered growing interest in cancer therapy. Our previous research demonstrated that zinc oxide nanoparticles (ZnO NPs), synthesized through an ultrasound-mediated green method using coffee leaves, functioned as effective nanocarriers for the controlled release of mangiferin (MGF). Here, we investigated the anticancer activity of MGF, ZnO NPs, and MGF-loaded ZnO NPs (MGF-ZnO NPs) on HepG2 and Caco-2 cells, along with their underlying anticancer mechanisms. We found that both ZnO NPs and MGF-ZnO NPs significantly reduced cell viability and increased the extracellular to intracellular pH ratio (pHe/pHi) and reactive oxygen species levels in HepG2 and Caco-2 cells. MGF-ZnO NPs further induced notable morphological changes and enhanced cell membrane permeability, chromatin condensation, and nuclear lysis. Additionally, both ZnO NPs and MGF-ZnO NPs increased the overall apoptotic rate in cancer cells, with MGF enhancing the cytotoxic effects of MGF-ZnO NPs. Molecular docking analysis revealed that MGF-ZnO NPs may disrupt cell membrane biogenesis by inhibiting the biological activity of choline/ethanolamine phosphotransferase 1 (CEPT1), an enzyme involved in phospholipid synthesis, through hydrogen bonding and hydrophobic interactions. Additionally, MGF-ZnO NPs also exhibited strong binding affinity to DNA bases through hydrogen bonds (DC15(B) and DG12(A)) and hydrophobic interactions (DC23(B), DG22(B), DA18(B), DA17(B), and others), potentially compromising DNA function. This study suggests that loading ZnO NPs with MGF is a promising approach to enhance cancer therapy and underscores the complex mechanisms involved in nanotherapeutic action.</p>\u0000 </div>","PeriodicalId":8344,"journal":{"name":"Applied Organometallic Chemistry","volume":"40 2","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Pt Single Atoms Outperforming Pd on Vo-TiO2 for Enhanced Photocatalytic Hydrogen Evolution Pt单原子在Vo-TiO2上优于Pd增强光催化析氢
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2025-12-22 DOI: 10.1002/aoc.70494
Hanyu Shi, Qian Wang, Yaxin Zhou, Chengchen Wang, Yukun Wang, Jun Li, Giuseppe Mele, Chen Wang

Green hydrogen serves as a crucial renewable energy source driving the transition of energy structures and advancing sustainable development. Photocatalytic technology represents one of the prominent approaches for green hydrogen production. Compared to traditional semiconductors, noble metal single-atom catalysts (SACs) have emerged as promising photocatalysts due to their high atomic utilization efficiency and superior catalytic activity. In this work, Pt and Pd single atoms were separately anchored onto oxygen vacancies (Vo) on the TiO2 surface via a facile photodeposition method, yielding Pt or Pd monometallic single-atom loaded catalysts (Pt SAs/Vo-TiO2 and Pd SAs/Vo-TiO2). The optimal photodeposition time was investigated. Results demonstrate that the hydrogen evolution rate of Pt SAs/Vo-TiO2 reached 2375.76 μmol h−1 gcat.−1, while that of Pd SAs/Vo-TiO2 achieved 1875.72 μmol h−1 gcat.−1. These values are 76.5-fold and 60.4-fold higher than that of pristine TiO2, respectively. Density functional theory (DFT) calculations reveal that the introduction of single atoms reduces the band gap of the catalyst, consistent with the experimental findings. This study provides optimal parameters for synthesizing efficient single-atom catalysts.

绿色氢能是推动能源结构转型、促进可持续发展的重要可再生能源。光催化技术是绿色制氢的重要途径之一。与传统半导体相比,贵金属单原子催化剂因其高原子利用率和优异的催化活性而成为一种很有前途的光催化剂。在这项工作中,通过简单的光沉积方法将Pt和Pd单原子分别锚定在TiO2表面的氧空位(Vo)上,生成Pt或Pd单金属单原子负载催化剂(Pt SAs/Vo-TiO2和Pd SAs/Vo-TiO2)。研究了最佳光沉积时间。结果表明:Pt SAs/Vo-TiO2的析氢速率达到2375.76 μmol h−1 gcat;−1,Pd SAs/Vo-TiO2的μmol h−1 gcat为1875.72。这些值分别是原始TiO2的76.5倍和60.4倍。密度泛函理论(DFT)计算表明,单原子的引入减小了催化剂的带隙,与实验结果一致。本研究为高效单原子催化剂的合成提供了最佳参数。
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引用次数: 0
Biogenic Chromium (III) Nanoparticles From Adiantum capillus-veneris Exhibit Potent Antioxidant and Antidiabetic Effects 生物源铬(III)纳米颗粒显示出有效的抗氧化和降糖作用
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2025-12-22 DOI: 10.1002/aoc.70496
Muhammad Iftikhar, Muhammad Zahoor, Muhammad Esa, Amal Alotaibi

Chromium is an essential trace element that exerts antidiabetic effects by enhancing insulin sensitivity and upregulating key proteins and genes involved in glucose uptake and metabolism. The antidiabetic potential of chromium nanoparticles (CrNPs) and Adiantum capillus-veneris has been studied separately; however, the conversion of chromium into biogenic CrNPs using the plant extract and the evaluation of their effects on carbohydrate-hydrolyzing enzymes remain unexplored. In this study, CrNPs were synthesized using A. capillus-veneris extract, characterized through various instrumental techniques and evaluated for their antioxidant and antidiabetic potential in vitro. The optimal synthesis was achieved at a 4:9 (v/v) ratio of plant extract to chromium salt. The synthesized CrNPs were crystalline, irregular to round in shape, with sizes ranging from 58 to 90 nm, thermally stable up to 280°C, and exhibited a strong absorbance peak in the UV–Vis range at 420 nm. EDX analysis confirmed the presence of chromium at ~0.6 keV. The resulting CrNPs showed excellent antioxidant (DPPH, IC50 = 100 μg/mL; ABTS, IC50 = 125 μg/mL) and notable inhibition of carbohydrate-hydrolyzing enzymes; α-amylase (91.3% inhibition at 1000 μg/mL, IC₅₀ = 127 μg/mL) and α-glucosidase (86.4% inhibition at 1000 μg/mL, IC₅₀ = 140 μg/mL). CrNPs exhibited stronger biological potentials and outperformed both the aqueous and methanolic extracts of A. capillus-veneris plant, as well as chromium chloride hexahydrate in the antioxidant and antidiabetic assays. In conclusion, these activities are likely due to enhanced bioavailability and polyphenol–enzyme interactions, which significantly improved the activity of chromium chloride hexahydrate upon its conversion into CrNPs. Further validation in experimental diabetic models is warranted.

铬是一种必需的微量元素,通过增强胰岛素敏感性和上调参与葡萄糖摄取和代谢的关键蛋白质和基因来发挥抗糖尿病作用。本文分别研究了纳米铬颗粒(CrNPs)和黄芪的抗糖尿病潜能;然而,利用植物提取物将铬转化为生物源CrNPs以及评估其对碳水化合物水解酶的影响仍未得到探索。在本研究中,我们利用毛茛提取物合成了CrNPs,通过各种仪器技术对其进行了表征,并对其体外抗氧化和抗糖尿病潜力进行了评估。以植物提取物与铬盐的体积比为4:9为最佳合成条件。合成的CrNPs为结晶状,形状不规则至圆形,尺寸范围为58 ~ 90 nm,热稳定性高达280℃,在420 nm处有很强的紫外-可见吸收峰。EDX分析证实在~0.6 keV处存在铬。所制得的CrNPs具有良好的抗氧化性(DPPH, IC50 = 100 μg/mL; ABTS, IC50 = 125 μg/mL)和显著的糖水解酶抑制作用;α-淀粉酶(在1000 μg/mL时抑制91.3%,IC₅₀= 127 μg/mL)和α-葡萄糖苷酶(在1000 μg/mL时抑制86.4%,IC₅₀= 140 μg/mL)。CrNPs表现出更强的生物学潜力,在抗氧化和抗糖尿病试验中优于毛茛植物的水提液和甲醇提取物,以及六水氯化铬。综上所述,这些活性可能是由于提高了生物利用度和多酚-酶的相互作用,从而显著提高了六水氯化铬转化为crnp的活性。在实验性糖尿病模型中进一步验证是必要的。
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引用次数: 0
Photochromic Polynuclear Dysprosium Single-Molecule Magnets With Anthracene-9-Carboxylate 含9-羧酸蒽酯的光致变色多核镝单分子磁体
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2025-12-22 DOI: 10.1002/aoc.70499
Chun-Jiang Li, Bei Hu, Ying Liu, Hui-Hui Yu, Shu-Ying Luo, Qing-Hu Teng, Fu-Pei Liang, Kai Wang

Photochromic dysprosium single-molecule magnets (Dy-SMMs) not only possess excellent intrinsic magnetic properties but also facilitate the preparation of intelligent devices owing to the integration of photochromism. However, related cases are still limited up to now. Herein, we report two photochromic polynuclear Dy-SMMs, [Et3NH][Dy4(ana)9(OH)4(CH3CN)2(H2O)]·solvents (1; Hana = anthracene-9-carboxylatic acid) and [Et3NH]2[Dy6(Tox)4(aca)12(OH)2(CH3OH)2]·solvents (2; Tox = N-TEMPO oxamate ion). They have tetrahedral [Dy4(OH)4]12+ and double-layered cage-like [Dy6(Tox)4 (OH)2]12+ cores, respectively, which are ligated by ana ligands into tetra- and hexa-nuclear cluster structures. Both 1 and 2 exhibit zero-field single-molecule magnet (SMM) behavior featuring a single magnetic relaxation process, which evolved into dual-relaxation processes upon the application of external dc fields. They also exhibit expected photochromic behaviors. The emergence of new peaks in the UV–Vis spectra and the quenching of photoluminescence (PL) emission peaks suggest that their photochromism could be attributed to the photogeneration of radical species in the systems.

光致变色镝单分子磁体(Dy-SMMs)不仅具有优异的固有磁性能,而且由于光致变色的集成,使其易于制备智能器件。然而,到目前为止,相关案例仍然有限。本文报道了两种光致变色多核Dy-SMMs, [Et3NH][Dy4(ana)9(OH)4(CH3CN)2(H2O)]·溶剂(1;Hana =蒽-9-羧酸)和[Et3NH]2[Dy6(Tox)4(aca)12(OH)2(CH3OH)2]·溶剂(2;Tox−= N-TEMPO草酸盐离子)。它们分别具有四面体[Dy4(OH)4]12+和双层笼状[Dy6(Tox)4 (OH)2]12+核,并通过反核配体连接成四核和六核簇结构。1和2均表现为零场单分子磁体(SMM)行为,表现为单磁弛豫过程,在外加直流场作用下演变为双磁弛豫过程。它们也表现出预期的光致变色行为。紫外可见光谱中新峰的出现和光致发光(PL)发射峰的猝灭表明它们的光致变色可能归因于体系中自由基的光生。
{"title":"Photochromic Polynuclear Dysprosium Single-Molecule Magnets With Anthracene-9-Carboxylate","authors":"Chun-Jiang Li,&nbsp;Bei Hu,&nbsp;Ying Liu,&nbsp;Hui-Hui Yu,&nbsp;Shu-Ying Luo,&nbsp;Qing-Hu Teng,&nbsp;Fu-Pei Liang,&nbsp;Kai Wang","doi":"10.1002/aoc.70499","DOIUrl":"https://doi.org/10.1002/aoc.70499","url":null,"abstract":"<div>\u0000 \u0000 <p>Photochromic dysprosium single-molecule magnets (Dy-SMMs) not only possess excellent intrinsic magnetic properties but also facilitate the preparation of intelligent devices owing to the integration of photochromism. However, related cases are still limited up to now. Herein, we report two photochromic polynuclear Dy-SMMs, [Et<sub>3</sub>NH][Dy<sub>4</sub>(ana)<sub>9</sub>(OH)<sub>4</sub>(CH<sub>3</sub>CN)<sub>2</sub>(H<sub>2</sub>O)]·solvents (<b>1</b>; Hana = anthracene-9-carboxylatic acid) and [Et<sub>3</sub>NH]<sub>2</sub>[Dy<sub>6</sub>(Tox)<sub>4</sub>(aca)<sub>12</sub>(OH)<sub>2</sub>(CH<sub>3</sub>OH)<sub>2</sub>]·solvents (<b>2</b>; Tox<sup>−</sup> = <i>N</i>-TEMPO oxamate ion). They have tetrahedral [Dy<sub>4</sub>(OH)<sub>4</sub>]<sup>12+</sup> and double-layered cage-like [Dy<sub>6</sub>(Tox)<sub>4</sub> (OH)<sub>2</sub>]<sup>12+</sup> cores, respectively, which are ligated by ana<sup>−</sup> ligands into tetra- and hexa-nuclear cluster structures. Both <b>1</b> and <b>2</b> exhibit zero-field single-molecule magnet (SMM) behavior featuring a single magnetic relaxation process, which evolved into dual-relaxation processes upon the application of external dc fields. They also exhibit expected photochromic behaviors. The emergence of new peaks in the UV–Vis spectra and the quenching of photoluminescence (PL) emission peaks suggest that their photochromism could be attributed to the photogeneration of radical species in the systems.</p>\u0000 </div>","PeriodicalId":8344,"journal":{"name":"Applied Organometallic Chemistry","volume":"40 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145846020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Pd-PEPPSI-NHC Analogues Bearing Cycloalkane Ring-Fused Pyridine Ligands: Synthesis, Structure and Catalytic Studies 含环烷烃环融合吡啶配体的Pd-PEPPSI-NHC类似物:合成、结构和催化研究
IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED Pub Date : 2025-12-22 DOI: 10.1002/aoc.70497
Jin Yang

The Pd-PEPPSI-NHC complexes (PEPPSI = pyridine-enhanced precatalyst preparation stabilisation initiation, NHC = N-heterocyclic carbene) have been widely applied in the Pd-catalyzed cross-coupling reactions. Further studies on the structures of Pd-PEPPSI-NHC complexes have shown that not only the NHCs, the ancillary ligands surrounding the Pd centre also play important roles in their catalytic reactions. For this purpose, a series of Pd-PEPPSI-NHC analogues bearing cycloalkane ring-fused pyridines (CA-Py) as the ancillary ligand were readily prepared and characterized by 1H NMR, 13C NMR, elemental analysis and x-ray crystallography. The catalytic activities of the well-defined Pd–NHC complexes have been evaluated with respect to Suzuki–Miyaura cross-coupling reactions of aryl boronic acids with aryl chlorides and acyl chlorides, respectively.

Pd-PEPPSI-NHC配合物(PEPPSI =吡啶增强预催化剂制备稳定起始,NHC = n -杂环碳)在pd催化的交叉偶联反应中得到了广泛的应用。对Pd- peppsi - nhc配合物结构的进一步研究表明,除了NHCs外,Pd中心周围的辅助配体在其催化反应中也起着重要作用。为此,制备了一系列以环烷烃环融合吡啶(CA-Py)为辅助配体的Pd-PEPPSI-NHC类似物,并用1H NMR、13C NMR、元素分析和x射线晶体学对其进行了表征。在芳基硼酸与芳基氯化物和酰基氯化物的Suzuki-Miyaura交叉偶联反应中,评价了定义良好的Pd-NHC配合物的催化活性。
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Applied Organometallic Chemistry
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