Chemistry - An Asian Journal最新文献_第2页

Rapid Transformation of Carcinogenic 4-Nitrophenol by Nanoparticles Synthesized Using Recycled Copper Waste: A Sustainable Circular Economic Approach 利用回收铜废物合成纳米颗粒快速转化致癌物质4-硝基苯酚：可持续循环经济途径

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-29 DOI: 10.1002/asia.70970

Virender Kumar, Ravi Kumar, Gyanendra Kumar, Dhanraj T. Masram, Vijay Kumar Goel

{"title":"Rapid Transformation of Carcinogenic 4-Nitrophenol by Nanoparticles Synthesized Using Recycled Copper Waste: A Sustainable Circular Economic Approach","authors":"Virender Kumar, Ravi Kumar, Gyanendra Kumar, Dhanraj T. Masram, Vijay Kumar Goel","doi":"10.1002/asia.70970","DOIUrl":"https://doi.org/10.1002/asia.70970","url":null,"abstract":"<div>\u0000 \u0000 Novel Cu/Cu2O-nanoparticles have been synthesized by the most economical electrochemical method utilizing metallic waste. 4-NP is a toxic pollutant affecting both animal and plant kingdom, necessitating its elimination from environment. This study demonstrates that the prepared nano-catalysts efficiently catalyse the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) at room temperature under light condition. Further, the reduction process generates amine derivatives, which are intermediates in many industrial processes. This manuscript adheres to the principles of the circular economy by generating nanoparticles through the repurposing of metallic waste discarded by both industry and domestic users. Using scrapped copper from discarded air conditioner (AC) copper tubes as electrodes, we employed an electrochemical technique to develop Cu/Cu2O nanoparticles. The synthesized nanoparticles were characterized using field emission scanning electron microscopy (FE-SEM), transmission electron (TEM), EDX spectroscopy, powder x-ray diffraction (P-XRD), Fourier transformation infrared (FTIR) spectroscopy, x-ray photoelectron spectroscopy (XPS), Raman spectroscopy, cyclic voltammetry (CV), and Brunauer–Emmett–Teller (BET) analysis. Our study confirms 99% conversion of harmful 4-NP to 4-AP in a rapid reaction time of 5 min. Synthesized nanoparticles can be reused up to four times without losing catalytic activity. UV–vis spectroscopy demonstrated that reduction follows pseudo-second-order kinetics and adsorption follows Freundlich isotherm model.\u0000 </div>","PeriodicalId":145,"journal":{"name":"Chemistry - An Asian Journal","volume":"21 17","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856760","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

Polyphenols at the Helm: Excited State Photophysics and Mechanistic Insights Into Protein-Aggregation Inhibition Through Ultrafast Studies 多酚在掌舵：激发态光物理学和通过超快研究对蛋白质聚集抑制的机制见解

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-29 DOI: 10.1002/asia.70961

Shubhangi Majumdar, Apurva Mishra, Raktim Nath, Vijay Raj Tomar, Ambika Prasad Kar, Shashank Deep, Rahul Kar, Pramit K Chowdhury

{"title":"Polyphenols at the Helm: Excited State Photophysics and Mechanistic Insights Into Protein-Aggregation Inhibition Through Ultrafast Studies","authors":"Shubhangi Majumdar, Apurva Mishra, Raktim Nath, Vijay Raj Tomar, Ambika Prasad Kar, Shashank Deep, Rahul Kar, Pramit K Chowdhury","doi":"10.1002/asia.70961","DOIUrl":"https://doi.org/10.1002/asia.70961","url":null,"abstract":"<div>\u0000 \u0000 Understanding how small molecules modulate protein aggregation is pivotal for developing strategies against amyloid-related disorders. Polyphenols are promising modulators, yet the connection between their molecular photophysics and aggregation inhibition remains largely unresolved. In this article, femtosecond transient absorption spectroscopy has been employed to unravel the excited-state dynamics of some commonly used polyphenols, namely, Baicalein, EGCG, and Myricetin across varied environments—neat solvents, micelles and reverse micelles, and in the presence of globular and intrinsically disordered protein (in its native and aggregated forms). Excited-state intramolecular proton transfer (ESIPT) emerges to be highly sensitive to hydrogen-bonding, polarity, and local confinement, serving as a subpicosecond reporter of polyphenol–environment interactions. In protein systems, modulation of ESIPT dynamics signals environment-specific embedding of polyphenols within evolving protein landscapes. A unique tri-parameter correlation—linking binding affinities of the polyphenols to the native proteins, ESIPT lifetimes, and aggregation kinetics—reveals that inhibitory potency arises not from tight native binding but from selective engagement with aggregation-prone species. This work posits ESIPT as a sensitive molecular signature that links ultrafast photophysics to the functional inhibition of protein aggregation, providing new insights into how small molecules navigate complex biomolecular environments to regulate self-assembly pathways.\u0000 </div>","PeriodicalId":145,"journal":{"name":"Chemistry - An Asian Journal","volume":"21 17","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856690","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

Effects of Ligand Electronic Environment on Electrocatalytic Proton Reduction by Cobalt Complexes 配体电子环境对钴配合物电催化质子还原的影响

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-29 DOI: 10.1002/asia.70969

Karthikeyan L, Shobhit Mathur, Indrajit Roy, Somnath Maji

{"title":"Effects of Ligand Electronic Environment on Electrocatalytic Proton Reduction by Cobalt Complexes","authors":"Karthikeyan L, Shobhit Mathur, Indrajit Roy, Somnath Maji","doi":"10.1002/asia.70969","DOIUrl":"https://doi.org/10.1002/asia.70969","url":null,"abstract":"<div>\u0000 \u0000 Here we have synthesized two mononuclear cobalt (II) complexes of type [Co(L)(L/)]ClO4, where L = 4-methyl-N,N-bis((1-methyl-1H-benzo[d]imidazol-2-yl)methyl)aniline, L/ = 2,2/ bipyridine (for 1) and 4,4/-dimethyl-2,2/ bipyridine (for 2). The synthesized complexes were characterized by various spectroscopic techniques and the molecular integrity of the complexes was confirmed by the single crystal x-ray diffraction (SCXRD) analysis. The redox properties of the complexes were analyzed by Cyclic Voltammetry (CV). The electrocatalytic proton reduction studies were done using acetic acid as an external proton source in a non-aqueous medium. The overpotential for the electrocatalytic proton reduction was found to be 453 mV for 1 and 470 mV for 2, consistent with increased electron donation to the metal center by the methyl group in 2, which shifts the reduction potential to more negative values and alters the overpotential. The turnover frequencies (TOF) were 217 and 203 s−1 for 1 and 2, respectively. A plausible catalytic mechanism was proposed based on the experimental observations. The post-catalytic analyses confirmed the structural integrity of the catalysts, indicating homogeneous behavior under catalytic conditions. This study aims to contribute to the development of sustainable and efficient hydrogen production technologies, supporting the transition toward a sustainable energy future.\u0000 </div>","PeriodicalId":145,"journal":{"name":"Chemistry - An Asian Journal","volume":"21 17","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856692","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

Phosphine-Free NNN Bis-Iminopyridine Supported Zinc(II) Catalysts: A Sustainable Platform for C─C Bond Formation Reactions via Borrowing Hydrogen Approach of Primary Alcohols 无膦NNN双亚氨基吡啶负载锌（II）催化剂：伯醇借氢法形成C─C键的可持续平台

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-29 DOI: 10.1002/asia.70964

Rahul Saini, Prashant Kukreti, Tanya Pattnaik, Rahul Chauhan, Keshav Sharma, Abhishek Panwar, Sheela Kumari, Angshuman R. Choudhury, Kaushik Ghosh

{"title":"Phosphine-Free NNN Bis-Iminopyridine Supported Zinc(II) Catalysts: A Sustainable Platform for C─C Bond Formation Reactions via Borrowing Hydrogen Approach of Primary Alcohols","authors":"Rahul Saini, Prashant Kukreti, Tanya Pattnaik, Rahul Chauhan, Keshav Sharma, Abhishek Panwar, Sheela Kumari, Angshuman R. Choudhury, Kaushik Ghosh","doi":"10.1002/asia.70964","DOIUrl":"https://doi.org/10.1002/asia.70964","url":null,"abstract":"<div>\u0000 \u0000 In this study, we present a methodology for direct C─C bond formation using renewable primary alcohols as alkylating agents, catalyzed by base metal-derived Zn(II) complexes. We utilized two well-defined phosphine-free NNN bis-iminopyridine pincer ligands (L1 and L2) for the synthesis of zinc(II) catalysts C1 and C2, which were thoroughly characterized using UV–vis, IR, HRMS, and single-crystal x-ray diffraction techniques. Both complexes C1 and C2 effectively promoted the selective mono-alkylation of a variety of carbo-nucleophile, including aromatic ketones, α-tetralone, fluorene, and oxindole, by employing both aromatic and aliphatic primary alcohols as alkyl sources. A wide range of substrates, encompassing 42 derivatives, were investigated, resulting in isolated yields as high as 92%. The developed method was successfully applied at the gram scale, demonstrating its practical applicability and potential for scalability. Additionally, control experiments were performed to elucidate the reaction mechanism, and HRMS analysis verified the presence of significant Zn(II) intermediates involved in the catalytic process.\u0000 </div>","PeriodicalId":145,"journal":{"name":"Chemistry - An Asian Journal","volume":"21 17","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856691","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

Single-Atom and Subnanocluster Platforms for Next-Generation Clinical Practice: A Bench-to-Bedside Approach 下一代临床实践的单原子和亚纳米簇平台：从实验室到床边的方法

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-29 DOI: 10.1002/asia.70973

Shrodha Mondal, Prithidipa Sahoo

引用次数: 0

Stimuli-Responsive Biopolymer Carboxymethyl Tamarind-Based Hydrogel Composite Impregnated With IONPs for Sustained Administration of Levofloxacin 刺激响应生物聚合物羧甲基罗望子基水凝胶复合材料浸渍与离子束持续给药左氧氟沙星。

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-27 DOI: 10.1002/asia.70950

Priyanka Yadav, Sudhir G. Warkar, Anil Kumar

{"title":"Stimuli-Responsive Biopolymer Carboxymethyl Tamarind-Based Hydrogel Composite Impregnated With IONPs for Sustained Administration of Levofloxacin","authors":"Priyanka Yadav, Sudhir G. Warkar, Anil Kumar","doi":"10.1002/asia.70950","DOIUrl":"10.1002/asia.70950","url":null,"abstract":"<div>\u0000 \u0000 pH-sensitive polymeric hydrogels are considered promising candidates for oral drug delivery because they can respond to changes in the surrounding environment or adapt to the biological environment. In the present study, novel hydrogel composites were developed via free radical polymerization using biogenically (Citrus limetta peel extract) synthesized iron oxide nanoparticles (IONPs) as fillers, carboxymethyl tamarind kernel gum as a biopolymer, and poly(acrylamide) to form the polymeric network of CMTG-PAM-IONPs hydrogel composite for levofloxacin delivery. The prepared hydrogel composites were characterized, and swelling studies were carried out to evaluate the influence of IONPs on the swelling behavior of the hydrogels. The results showed that the effect of IONPs on swelling became more noticeable when the nanoparticle concentration in the hydrogel formulation was increased up to approximately 0.02 g. In addition, the gel content and porosity of the hydrogels were determined, and the levofloxacin drug loading capacity was calculated. The in vitro drug release studies were performed at pH 1.2 and pH 7.4 at 37°C to simulate gastric and intestinal conditions. The drug release mechanism was studied. Furthermore, the cytotoxicity results indicated that the prepared hydrogel composites have potential for biomedical applications, particularly as pH-responsive carriers for oral drug delivery.\u0000 </div>","PeriodicalId":145,"journal":{"name":"Chemistry - An Asian Journal","volume":"21 16","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838689","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

Potassium-Ion-Directed Three-Dimensional Assembly of a Dense and Thermally Robust Nitrogen-Rich Tetrazine Framework 钾离子定向三维组装密集和热稳健富氮四氮框架

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-22 DOI: 10.1002/asia.70963

Jatinder Singh, Parul Saini, Richard J. Staples, Jean'ne M. Shreeve

引用次数: 0

C─S Bond Metathesis Reactions: Concepts, Scope, and Mechanistic Insight C─S键复合反应：概念、范围与机制

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-22 DOI: 10.1002/asia.70948

Hongmei Liu, Youwei Xie

引用次数: 0

AlPO4-Modified 5.2 V LiCoMnO4 Cathode With Enhanced Electrochemical Performance alpo4修饰的5.2 V LiCoMnO4阴极电化学性能增强

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-22 DOI: 10.1002/asia.70962

Karayi Mangat Athira, Sreekumar Sreedeep, Yun-Sung Lee, Vanchiappan Aravindan

{"title":"AlPO4-Modified 5.2 V LiCoMnO4 Cathode With Enhanced Electrochemical Performance","authors":"Karayi Mangat Athira, Sreekumar Sreedeep, Yun-Sung Lee, Vanchiappan Aravindan","doi":"10.1002/asia.70962","DOIUrl":"https://doi.org/10.1002/asia.70962","url":null,"abstract":"<div>\u0000 \u0000 A high-voltage Li-rich LiCoMnO4 (LCMO) cathode is successfully prepared using the co-precipitation technique and then tuned with varying concentrations of AlPO4 coating (1, 3, 5, and 10 wt.%). Among these, the LCMO@AlPO4_3 wt.% shows excellent electrochemical performance with a specific capacity of 103 mAh g−1 and 71% capacity retention. This is significantly better than the pristine sample, which has a specific capacity of 91 mAh g−1 and 60% capacity retention after 100 cycles. Additionally, the Li-diffusion coefficient is computed using electrochemical impedance spectroscopy, and the optimized coated sample exhibited a higher diffusion value. To realize the practical feasibility of such an AlPO4-modified cathode, the full-cell is fabricated using an Li4Ti5O12 anode under balanced loading conditions. At ambient temperature conditions, the full cell offered an energy density of 227 Wh kg−1. To produce high-energy next-generation cathodes for lithium-ion batteries, this research offers the concept of surface modification with inexpensive Li-rich materials\u0000 </div>","PeriodicalId":145,"journal":{"name":"Chemistry - An Asian Journal","volume":"21 16","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148784796","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

Eco-Friendly Amide Synthesis Using a Metal and Halogen-Free Deep Eutectic Solvent 利用无金属和无卤素深度共晶溶剂合成环保酰胺

IF 3.2 3区化学

Chemistry - An Asian Journal Pub Date : 2026-08-21 DOI: 10.1002/asia.70958

Susmita Mandal, Chalachitra Das, Archana Jain, Tarun K. Panda

引用次数: 0