Enas Daoud, Aya Nabeel Yassser, Israa Abdulhameed Ahmad, Manoj A. Vora, Roopashree R, K. Anju, Priyanka Sharma, Mirjalol Ismoilov, Hojat Narimani
{"title":"Ultrasound-driven green chemistry: efficient synthesis of 4H-pyrimido[2,1-b]benzothiazoles with GO-Disulfide-Diamide-Cu(0) nanocomposite","authors":"Enas Daoud, Aya Nabeel Yassser, Israa Abdulhameed Ahmad, Manoj A. Vora, Roopashree R, K. Anju, Priyanka Sharma, Mirjalol Ismoilov, Hojat Narimani","doi":"10.1007/s11164-026-06035-7","DOIUrl":"10.1007/s11164-026-06035-7","url":null,"abstract":"<div><p>This work presents a sustainable, highly efficient method for synthesizing pharmacologically relevant 4<i>H</i>-pyrimido[2,1-<i>b</i>]benzothiazole derivatives, aiming to inspire confidence in the scientific community’s ongoing efforts. The protocol employs a novel heterogeneous catalyst, a copper(0) nanocomposite stabilized on a disulfide-diamide functionalized graphene oxide (GO) support. Under mild ultrasound irradiation, this catalyst efficiently drives a one-pot multicomponent reaction at room temperature, using ethanol as a green solvent. The methodology demonstrates excellent substrate scope and generality, affording a library of eighteen diverse derivatives in consistently high isolated yields ranging from 90 to 97%. The catalyst could be readily recovered and reused for several consecutive cycles without a significant loss of its catalytic activity. This approach effectively combines the principles of green chemistry—featuring a reusable nanocatalyst, an environmentally benign solvent, and energy-efficient activation—to provide a practical, rapid, and high-yielding route to an important class of nitrogen- and sulfur-containing heterocycles.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 8","pages":"5403 - 5436"},"PeriodicalIF":3.3,"publicationDate":"2026-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458892","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}
Yue Huang, Song Ru Fang, Yi Tong Feng, Huai Qin Fu, Peng Fei Liu, Hua Gui Yang
{"title":"Sub-2 nm titanium-doping iridium oxide electrocatalyst for stable acidic oxygen evolution","authors":"Yue Huang, Song Ru Fang, Yi Tong Feng, Huai Qin Fu, Peng Fei Liu, Hua Gui Yang","doi":"10.1007/s11164-026-06033-9","DOIUrl":"10.1007/s11164-026-06033-9","url":null,"abstract":"<div><p>Among various hydrogen production technologies, proton exchange membrane water electrolysis (PEMWE) shows significant potential due to its high efficiency and flexibility. However, its large-scale application is limited by the reliance on precious metals. Herein, we report the successful uniform doping of titanium (Ti) into iridium oxide (IrO<sub><i>x</i></sub>) through an organic ligand complexation strategy, obtaining a sub-2 nm Ti-doped IrO<sub><i>x</i></sub> (sub-Ti-IrO<sub><i>x</i></sub>) for stable oxygen evolution reaction in acid. Doped Ti regulates the Ir–O bond length to facilitate the formation of key intermediates, while also acting as an electron donor to suppress the over-oxidation of IrO<sub><i>x</i></sub>, thereby enhancing both catalytic activity and stability. The ultra-small particles offer a larger electrochemical active surface area and facilitate good dispersion during the membrane electrode assembly fabrication, enabling the formation of a catalyst layer with highly uniform thickness. When incorporated into a proton exchange membrane electrolyzer, sub-Ti-IrO<sub><i>x</i></sub> exhibits a current density of 1 A cm<sup>−2</sup> at a voltage of 1.667 V and maintains stable operation for over 600 h with a voltage decay rate of approximately 33 μV h<sup>−1</sup>. This study confirms the effectiveness and feasibility of Ti doping in simultaneously enhancing both the activity and stability of Ir-based catalysts.</p></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 8","pages":"5835 - 5847"},"PeriodicalIF":3.3,"publicationDate":"2026-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458893","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}
Nishu Dhillayan, Jai Devi, Ruchika Sharma, Sonika Asija
{"title":"Antimalarial, antioxidant, and antimicrobial evaluation of pyrazole-hydrazone metal(II) complexes via docking and ADMET studies","authors":"Nishu Dhillayan, Jai Devi, Ruchika Sharma, Sonika Asija","doi":"10.1007/s11164-026-06045-5","DOIUrl":"10.1007/s11164-026-06045-5","url":null,"abstract":"<div><p>Malaria remains a major global health challenge, highlighting the need for effective antimalarial agents. In this research, four biologically active hydrazone ligands (<b>1–4</b>) and their sixteen transition metal complexes incorporating Co(II), Ni(II), Cu(II), and Zn(II) ions (<b>5–20</b>) were synthesized. The synthesized compounds were characterized using various spectroscopic and analytical techniques. The results showed that the ligands bind to the respective metal ions in an octahedral geometry <i>via</i> the azomethine nitrogen, enolic oxygen, and water oxygen atoms. Biological potential was determined using antimalarial microassays, antimicrobial dilution tests, and DPPH-based antioxidant analysis. The complexes of Cu(II) (<b>7, 19</b>) and Zn(II) (<b>8, 20</b>) revealed potent inhibitory effects against <i>P. falciparum</i> (3D7 strain), with IC<sub>50</sub> values ranging from 0.64 to 0.72 µg/mL, and possessed considerable antimicrobial activities similar to ciprofloxacin and fluconazole (MIC = 0.0068 and 0.0159 μmol/mL). Moreover, the compounds Cu(II) (<b>15</b>) and Zn(II) (<b>16</b>) exhibited robust antioxidant activity, with IC<sub>50</sub> values of 3.50 ± 0.06 and 3.55 ± 0.06 µM, respectively. To validate the in vitro antimalarial activity results, molecular docking was performed to evaluate the most active ligand (<b>1</b>) and its metal complexes (<b>5–8</b>) against <i>P. falciparum</i> lactate dehydrogenase (PDB ID: 1U5A). The docking results revealed a binding energy of − 7.07 and − 11.9 kcal/mol for ligand (<b>1</b>) and its complex Cu(II) (7). ADMET and PASS analysis also supported the experimental observations, confirming favorable pharmacokinetic profiles and drug-likeness. The results indicate that the synthesized metal complexes have potential as dual-functional drug candidates.</p></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 9","pages":"6603 - 6637"},"PeriodicalIF":3.3,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148699657","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":"Rational fabrication of S, N co-doped graphene quantum dots/PbBiO2I nanocomposite for boosted photocatalytic antibiotic degradation: interfacial engineering and mechanism insights","authors":"Ziang Chen, Yanbing Liu, Ting Zhou, Yu Shi, Yuanyuan Tao, Wei Jiang, Binxian Gu, Qingsong Hu","doi":"10.1007/s11164-026-06039-3","DOIUrl":"10.1007/s11164-026-06039-3","url":null,"abstract":"<div><p>Developing green and efficient photocatalysts is crucial in addressing the energy crisis and environmental remediation. In this study, we synthesized novel S, N co-doped graphene quantum dots (S, N-GQDs) anchored PbBiO<sub>2</sub>I nanospheres employing a reactive ionic liquid-assisted facile one-step solvothermal approach. We prepared a variety of S, N-GQDs/PbBiO<sub>2</sub>I nanocomposite with different loading amounts of S, N-GQDs and investigated their photocatalytic performance. Among these, S, N-GQDs/PbBiO<sub>2</sub>I-2 exhibits the highest degradation efficiency for antibiotic removal. The incorporation of S, N-GQDs significantly broadens the visible-light absorption range and accelerates the migration of photoinduced carriers, thereby enhancing photocatalytic activities. Various characterization techniques and experimental analyses were employed to explore the charge carrier transfer pathway in this system. Notably, the developed photocatalyst demonstrates two exceptional advantages: a broad-spectral response capability and environmentally-friendly properties, which are of significant relevance for practical applications. This study provides insights for the rational design of high-performance, wide-spectral-light-driven, and environmentally-friendly photocatalysts in the field of environmental remediation.</p></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 8","pages":"5849 - 5869"},"PeriodicalIF":3.3,"publicationDate":"2026-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148459098","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}
Somasundaram Kasiviswanathan, K. Chanthirasekaran, Ganesan M, S. Kumaran, Atish Baburao Mane, T. J. Nagalakshmi
{"title":"Engineering rGO@CeO2/Co3O4 nanocomposite for dual-functional electrocatalysis in solar energy conversion and environmental remediation","authors":"Somasundaram Kasiviswanathan, K. Chanthirasekaran, Ganesan M, S. Kumaran, Atish Baburao Mane, T. J. Nagalakshmi","doi":"10.1007/s11164-026-06030-y","DOIUrl":"10.1007/s11164-026-06030-y","url":null,"abstract":"<div><p>The multifunctional rGO@CeO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub> nanocomposite, designed for solar energy conversion, and pollutant degradation applications, was successfully synthesized using a sol–gel approach. Structural, morphological, and chemical analyses were performed using XRD, SEM, and XPS techniques. XRD results confirmed the crystalline phases of CeO<sub>2</sub> and Co<sub>3</sub>O<sub>4</sub>, while the absence of the characteristic rGO peak indicated its uniform dispersion within the composite matrix. SEM observations revealed that the incorporation of rGO transformed the aggregated morphology into interconnected nanosheet structures, providing a conductive network that reduced particle agglomeration and enhanced charge transport. XPS analysis confirmed the coexistence of Ce<sup>4+</sup>/Ce<sup>3+</sup> and Co<sup>3+</sup>/Co<sup>2+</sup> oxidation states, indicating strong interfacial electronic interactions between rGO and the metal oxides. Owing to the synergistic effect of improved conductivity, efficient charge separation, and increased active surface area, the rGO@CeO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub> electrode exhibited superior electrochemical performance. When employed as a counter electrode in dye-sensitized solar cells (DSSCs), the hybrid nanocomposite achieved a power conversion efficiency of 9.2 ± 0.02%, exceeding both CeO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub> and conventional Pt electrodes. In photocatalytic studies, the composite demonstrated an excellent tetracycline degradation efficiency of 98%, significantly higher than the comparison electrodes. The enhanced multifunctional performance is mainly attributed to the synergistic interaction between rGO and CeO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub>, which facilitates rapid electron transport, suppresses charge recombination, and increases the number of active catalytic sites. These findings demonstrate the potential of rGO@CeO<sub>2</sub>/Co<sub>3</sub>O<sub>4</sub> as an efficient and sustainable material for next-generation photoelectrochemical and environmental remediation applications.</p></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 8","pages":"5813 - 5833"},"PeriodicalIF":3.3,"publicationDate":"2026-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148459026","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}
Mesut Namlı, Uğur Işık, Cihan Kantar, Selami Şaşmaz, Murat Aydemir
{"title":"The catalytic performance of novel (Co, Ni, Cu, Zn) phthalocyanines containing 2-methylresorcinol azo dyes in transfer hydrogenation reactions of aldehydes and ketones","authors":"Mesut Namlı, Uğur Işık, Cihan Kantar, Selami Şaşmaz, Murat Aydemir","doi":"10.1007/s11164-026-06043-7","DOIUrl":"10.1007/s11164-026-06043-7","url":null,"abstract":"<p>Hydrogen transfer reduction systems have attracted increasing attention from synthetic chemists due to their operational simplicity. Herein, we report the synthesis, characterization and catalytic activity of four newly designed metallophthalocyanines containing Co (<b>2a</b>), Ni (<b>2b</b>), Cu (<b>2c</b>), and Zn (<b>2d</b>) prepared from an azo-phthalonitrile derivative incorporating 2-methylresorcinol into the ligand framework. All synthesized compounds were characterized by FT-IR and UV–Vis spectroscopy, as well as elemental analysis. The catalytic activities of the metallophthalocyanines were evaluated in the transfer hydrogenation (TH) reactions of various aldehydes, ketones, and their derivatives under an inert atmosphere using 2-propanol as the hydrogen source. Nickel phthalocyanine (<b>2b</b>) exhibited the highest catalytic performance, affording 99% conversion of acetophenone within 5 h and benzaldehyde within 1 h. The catalytic results revealed that the transfer hydrogenation activity depends not only on the metal center but also on the structural properties of the ligand environment surrounding the complex. Therefore, the catalytic efficiency of these systems is strongly governed by both the electronic nature of the central metal ion, and the substituent groups present in the ligand framework.</p>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 7","pages":"4655 - 4674"},"PeriodicalIF":3.5,"publicationDate":"2026-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11164-026-06043-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236737","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":"Green synthesis of Cu nanoparticles on the surface of porphyrin-functionalized metal–organic framework using Aloe vera extract (TMU-17-NH-Por@Cu) as a unique heterogeneous catalyst for Biginelli reaction","authors":"Ghodsieh Nanvakenary, Heshmatollah Alinezhad, Ameneh Kiani","doi":"10.1007/s11164-026-06031-x","DOIUrl":"10.1007/s11164-026-06031-x","url":null,"abstract":"<div><p>In this research, a hematoporphyrin-functionalized metal–organic framework is introduced as a new and unique platform for stabilization of Cu nanoparticles. For the first time, hematoporphyrin (Por) has been incorporated as a ligand onto TMU-17-NH<sub>2</sub> to create a stable support for the deposition of Cu nanoparticles to design a highly active, stable, and reusable catalyst for the Biginelli condensation reaction. The synthesis and stabilization of Cu nanoparticles on the surface of TMU-17-NH-Por were performed using <i>Aloe vera</i> extract as a reducing and stabilizing agent. In this procedure, neither chemical reducing agent nor any gaseous hydrogen is used for the synthesis of the copper nanoparticles. The Biginelli reaction is catalyzed with TMU-17-NH-Por@Cu under mild and green conditions at atmospheric pressure. The role of the Por ligand that is based on four pyrrole-like moieties with abundant electron-rich atoms with the decrease in Cu mol% and the increase in stability was notable.</p></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 8","pages":"5367 - 5387"},"PeriodicalIF":3.3,"publicationDate":"2026-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458944","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}
Qiao Peng, Chang Xu, Shengwei Zhang, Jinlong Zhang, Juying Lei, Ziwei Ye, Lingzhi Wang
{"title":"Enhancing photocatalytic methane oxidation by coupling Pt-mediated charge transfer with hydrophobic triphase interface regulation","authors":"Qiao Peng, Chang Xu, Shengwei Zhang, Jinlong Zhang, Juying Lei, Ziwei Ye, Lingzhi Wang","doi":"10.1007/s11164-026-06029-5","DOIUrl":"10.1007/s11164-026-06029-5","url":null,"abstract":"<div><p>The low solubility of methane in water and the resulting gas–liquid–solid mass-transfer limitation severely restrict the efficiency of photocatalytic selective methane oxidation. Herein, Pt-In<sub>2</sub>O<sub>3</sub> catalysts were constructed and further modified with triethoxy-n-octylsilane (OTES) to achieve the synergistic enhancement of charge transfer and triphase mass transport. Pt loading and OTES grafting preserved the bulk crystal phase of In<sub>2</sub>O<sub>3</sub>, while establishing a Pt/In<sub>2</sub>O<sub>3</sub> heterointerface and a hydrophobic surface layer. Pt mainly promoted photogenerated charge separation and interfacial electron transfer, whereas OTES had only a minor effect on the electronic process. Among the catalysts examined, the optimized catalyst showed the best performance, giving a total productivity of 4659.1 μmol g<sup>−1</sup> h<sup>−1</sup>, a liquid-phase productivity of 4116.7 μmol g<sup>−1</sup> h<sup>−1</sup>, and a liquid-product selectivity of 88.4%, with the liquid-phase productivity being 1.44 times that of the corresponding catalyst without OTES modification. The activity showed a volcano-type dependence on OTES dosage, indicating an optimal hydrophobic range. Trapping experiments, electron paramagnetic resonance (EPR), and chemical-probe analyses identified ·OH and ·O<sub>2</sub><sup>−</sup>/·OOH as the key reactive species involved in the reaction. This work demonstrates that tuning interfacial wettability is an effective strategy for enhancing photocatalytic methane oxidation in water.</p></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 7","pages":"4435 - 4454"},"PeriodicalIF":3.5,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236799","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 catalytic oxidation studies of a novel keggin-type complex catalyst [(CH2)5NH2]5PMo10V2O40","authors":"Shi Jinyi, Ding Yuansheng","doi":"10.1007/s11164-026-06032-w","DOIUrl":"10.1007/s11164-026-06032-w","url":null,"abstract":"<div><p>Developing efficient and robust polyoxometalate catalysts is highly desirable for green organic oxidation. In this work, we synthesized a novel organic–inorganic hybrid Keggin-type complex, [(CH<sub>2</sub>)<sub>5</sub>NH<sub>2</sub>]<sub>5</sub>PMo<sub>10</sub>V<sub>2</sub>O<sub>40</sub>, via the assembly of phosphomolybdovanadic acid and piperidine. Structural analyses using FT-IR and powder XRD confirmed the intact preservation of the parent [PMo<sub>10</sub>V<sub>2</sub>O<sub>40</sub>]<sup>5−</sup> framework, while the intercalation of piperidinium cations induced significant lattice expansion and structural rearrangement. Thermogravimetric analysis revealed a remarkable enhancement in thermal stability, with the hybrid resisting decomposition up to 433 °C. The practical utility of this complex was evaluated in the selective oxidation of benzaldehyde to benzoic acid using aqueous H<sub>2</sub>O<sub>2</sub> under solvent-free conditions. Under optimal conditions (75 °C, 2.5 h), the catalyst achieved an isolated yield of over 86% with excellent selectivity. This enhanced catalytic performance is attributed to the synergistic V/Mo heterometallic effect combined with the unique hydrophobic microenvironment created by the organic cations.</p></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 8","pages":"5389 - 5401"},"PeriodicalIF":3.3,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148458946","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":"In situ ATR-FTIR study of photocatalytic conversion of organic compounds on Hematite-rich clay mineral surface","authors":"Hanan H. Mohamed, Yi-Hao Chew, Hiroshi Onishi","doi":"10.1007/s11164-026-06034-8","DOIUrl":"10.1007/s11164-026-06034-8","url":null,"abstract":"<div><p>This study employs in situ attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy to elucidate the photocatalytic conversion pathways of three representative organic compounds: methanol, phenol, and methylene blue (MB) on Fe-based natural clay nanoparticles under solar-light irradiation. Time-resolved spectral analysis reveals distinct transformation mechanisms governed by the interaction between photogenerated charge carriers, surface hydroxyl groups, and reactive oxygen species. Methanol undergoes stepwise dehydrogenation and oxidation, evidenced by the bleaching of C–O and C–H vibrations and the emergence of methoxy-, carbonyl-, and CO/CO<sub>2</sub>-related bands. Phenol displays clear signatures of aromatic ring activation and oxidative transformation, with parent phenolic vibrations decreasing, while oxygenated aromatic intermediates and aliphatic fragments evolve. Under N<sub>2</sub>, complete band bleaching indicates photodesorption or non-oxidative decomposition in the absence of O<sub>2</sub>. MB undergoes rapid loss of dye-associated fingerprint features with simultaneous growth of bands assigned to oxidized aromatic/heteroaromatic and oxygenated surface-bound intermediates, accompanied by marked changes in surface hydroxyl populations. Overall, the results demonstrate that Fe-containing natural clays can promote light-driven oxidative transformation through identifiable surface reaction sequences and highlight in situ ATR-FTIR as a powerful approach for tracking interfacial intermediates and water/OH evolution on complex natural mineral photocatalysts.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":753,"journal":{"name":"Research on Chemical Intermediates","volume":"52 7","pages":"4455 - 4472"},"PeriodicalIF":3.5,"publicationDate":"2026-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236929","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}