The Royal Society of Chemistry最新文献_第2页

Heterointerface engineering of vanadium oxide/cobalt nitride as efficient electrocatalysts for alkaline overall water splitting.

IF 4.3 2区化学

Chemical Communications Pub Date : 2025-03-28 DOI: 10.1039/d5cc01549a

Tengfei Xu, Zhaohui Lu, Lan Yu, Wen Xin, Jie Sun, Haoze Zhou, Yanqing Jiao, Xiuwen Wang, Chunmei Lv

引用次数: 0

Unraveling the role of superoxide radicals in CdS quantum dot instability.

IF 4.3 2区化学

Chemical Communications Pub Date : 2025-03-28 DOI: 10.1039/d5cc00433k

Miaoli Gu, Xianglin Xiang, Bei Cheng, Jiaguo Yu, Liuyang Zhang

引用次数: 0

Synthesis, photochromic properties, and bioactivity of spiropyrans with electron-donating/withdrawing substituents on indoline and [2H]-chromene rings.

IF 2.9 3区化学

Organic & Biomolecular Chemistry Pub Date : 2025-03-28 DOI: 10.1039/d5ob00033e

Abir Kayal, Navjot Kaur, Mrinmoy De

引用次数: 0

On the divergent reactivity of allenylstannanes generated from the O-directed free radical hydrostannation reaction of (±)-trans-3-(2-phenylcyclopropyl)prop-2-yn-1-ol. EPR evidence for the reversible addition of Ph₃Sn radicals to vinyl triphenyltins.

IF 2.9 3区化学

Organic & Biomolecular Chemistry Pub Date : 2025-03-28 DOI: 10.1039/d4ob01847h

K Lawrence E Hale, Alistair J Fielding, Karl J Hale

{"title":"On the divergent reactivity of allenylstannanes generated from the O-directed free radical hydrostannation reaction of (±)-trans-3-(2-phenylcyclopropyl)prop-2-yn-1-ol. EPR evidence for the reversible addition of Ph3Sn radicals to vinyl triphenyltins.","authors":"K Lawrence E Hale, Alistair J Fielding, Karl J Hale","doi":"10.1039/d4ob01847h","DOIUrl":"https://doi.org/10.1039/d4ob01847h","url":null,"abstract":"(±)-trans-3-(2-Phenylcyclopropyl)prop-2-yn-1-ol (5) undergoes O-directed rt free radical hydrostannation with 2 equiv. of Bu3SnH or Ph3SnH in PhMe to produce the α-cyclopropyl-β-stannylvinyl radicals 26 and 27, which rapidly ring-open to give the benzylic stannylhomoallenyl radicals 28 and 29. These, in turn, react with the excess stannane that is present to provide 21 and 23 as primary reaction products. The triphenylstannylallene 23 also undergoes a competitive Ph3Sn˙ addition to its central allene carbon. This affords the allylically-stabilised radical 31c, which itself reacts with the stannane to produce (Z)-6-phenyl-2,3-bis(triphenylstannyl)hex-3-en-1-ol (24). EPR studies of the reaction of 5 with Ph3SnH (1 equiv.) and cat. Et3B/O2 in PhMe at 250 K have failed to identify the radicals 27 and 29 in the reaction mixtures. Rather, a sharp dd is always observed whose multiplicity is consistent with it being the tris-Ph3Sn-stabilised free radical 33. The latter is suggested to arise from a reversible O-directed Ph3Sn˙ addition to 24. The radical 33 has 1Hβ values of 1.32 mT (13.2 G) and 0.57 mT (5.7 G) and a g of 2.0020.","PeriodicalId":96,"journal":{"name":"Organic & Biomolecular Chemistry","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735564","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

Selective inhibition of NikA mediated Ni(II) import in E. coli by the Indium(III)-EDTA complex.

IF 2.9 3区生物学

Metallomics Pub Date : 2025-03-28 DOI: 10.1093/mtomcs/mfaf008

Stephanie Sebastiampillai, Mark Nitz

{"title":"Selective inhibition of NikA mediated Ni(II) import in E. coli by the Indium(III)-EDTA complex.","authors":"Stephanie Sebastiampillai, Mark Nitz","doi":"10.1093/mtomcs/mfaf008","DOIUrl":"10.1093/mtomcs/mfaf008","url":null,"abstract":"Nickel is a required nutrient for bacteria to produce [NiFe]-hydrogenase and urease enzymes. [NiFe]-hydrogenase catalyzes the reversible conversion of hydrogen into protons and electrons and urease catalyzes the hydrolysis of urea into carbon dioxide and ammonia-both key in bacterial pathogenesis. As such, nickel trafficking and homeostasis are interesting targets for potential antibacterial strategies. In E. coli, NikA binds a Ni(II)-(L-His)2 chelate in the periplasm and delivers this complex to the NikBCDE transporter. Blocking Ni(II) uptake by NikA would prevent the biosynthesis of active [NiFe]-hydrogenase. Fe(III)-EDTA is a potent ligand for NikA, however due to the potential for reduction of Fe(III) to Fe(II), it has limited utility. Using Fe(III)-EDTA as a starting point for inhibitor design, similar stable complexes of Bismuth(III), Lutetium(III) and Indium(III) were investigated. The In(III)-EDTA complex is a potent inhibitor of cellular [NiFe]-hydrogenase activity (IC50 of 600 μM ± 100 μM) while being nontoxic to bacterial growth. The mechanism of In(III)-EDTA hydrogenase inhibition was confirmed by the inhibition of Ni(II)-dependent processing of HycE (hydrogenase-3), which could be rescued with the addition of exogenous nickel. To elucidate the binding affinity of In(III)-EDTA to NikA, isothermal titration calorimetry (ITC) was carried out, revealing stoichiometric 1:1 binding with a Kd of 17.3 µM ± 3.0 µM. Indium concentrations determined by inductively coupled plasma mass spectrometry in E. coli cells in the presence or absence of NikA showed no discernable difference, further supporting the competitive inhibition of nickel uptake by blocking NikA.","PeriodicalId":89,"journal":{"name":"Metallomics","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143555312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel strategy for alkylation via amide activation: synthesis of N-substituted 2-pyridones and tetrahydropyridines.

IF 2.9 3区化学

Organic & Biomolecular Chemistry Pub Date : 2025-03-28 DOI: 10.1039/d5ob00140d

Qiao Song, Shun Wang, Sheng Wang, Dong Xing, Zhouyu Wang

引用次数: 0

Visible-light-induced thiol-ene/air oxidation tandem reaction for sulfoxide synthesis: a photocatalyst-free and metal-free approach.

IF 2.9 3区化学

Organic & Biomolecular Chemistry Pub Date : 2025-03-28 DOI: 10.1039/d5ob00136f

Ming-Hao Zhao, Xu Liu, Yu-Chen Yang, Lijia Wang

引用次数: 0

"Magnetic marshmallows" for soft robotics: magneto-mechanical characterization and application in switchable adhesion structures.

IF 2.9 3区化学

Soft Matter Pub Date : 2025-03-28 DOI: 10.1039/d4sm01503g

Maxime Bès, Samuel Lamont, Azadeh Dufour-Lamartinie, Jean-Claude Mancer, Ludovic Olanier, Jérôme Robert, Franck Vernerey, Artem Kovalenko

{"title":"\"Magnetic marshmallows\" for soft robotics: magneto-mechanical characterization and application in switchable adhesion structures.","authors":"Maxime Bès, Samuel Lamont, Azadeh Dufour-Lamartinie, Jean-Claude Mancer, Ludovic Olanier, Jérôme Robert, Franck Vernerey, Artem Kovalenko","doi":"10.1039/d4sm01503g","DOIUrl":"https://doi.org/10.1039/d4sm01503g","url":null,"abstract":"Soft magnetic composites exhibit fast and programmable macroscopic deformations in magnetic fields, making them promising for applications in soft untethered robotics or in designing surfaces with switchable adhesion or wetting properties. However, due to the incompressible nature of soft, non-porous actuators, their compression or elongation leads to important shape change due to lateral expansion or compression, respectively. In practice, bending and folding remain preferred actuation modes. Here, we explore the potential of magnetic elastomer \"marshmallows\" as compressible actuators with low Poisson's ratio. Using a sacrificial salt pellet template method, we fabricate polydimethylsiloxane foams with open porosity filled with carbonyl iron particles. The obtained foams exhibit strong reversible compression under the influence of a magnetic field gradient. We reveal the significance of stress accumulation in the direction of the field gradient due to magnetic body forces and the key role of the foam thickness in magnetic strain. We propose a simple analytical model based on the action of a magnetic body force that explains these effects. Finally, we demonstrate the development of a novel switchable adhesion structure, in which the magnetic foam covered with a pressure-sensitive adhesive serves as a compressible actuator able to switch between adhesive and non-adhesive states.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143727254","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

Kovacs-like memory effect in a sheared colloidal glass: role of non-affine flows.

IF 2.9 3区化学

Soft Matter Pub Date : 2025-03-28 DOI: 10.1039/d4sm01514b

Maitri Mandal, Abhishek Ghadai, Rituparno Mandal, Sayantan Majumdar

{"title":"Kovacs-like memory effect in a sheared colloidal glass: role of non-affine flows.","authors":"Maitri Mandal, Abhishek Ghadai, Rituparno Mandal, Sayantan Majumdar","doi":"10.1039/d4sm01514b","DOIUrl":"https://doi.org/10.1039/d4sm01514b","url":null,"abstract":"Memory effect reflects a system's ability to encode, retain and retrieve information about its past. Such effects are essentially an out-of-equilibrium phenomenon providing insight into the complex structural and dynamical behavior of the system. Kovacs effect is one such memory effect that is traditionally associated with thermal history. Although studies on the Kovacs-like memory effect have been extended to mechanical perturbations such as compression-decompression, whether such effects can also be observed under volume-conserving perturbations like shear, remains unclear. Combining experiments, simulations and linear response theory we demonstrate Kovacs-like memory effect in a sheared colloidal glass. Moreover, we explore the influence of non-linear perturbations and establish a correlation between the deviation from linear response prediction and microscopic non-affine flows generated due to such large deformations in affecting the memory effect. Our study not only extends Kovacs-like memory effect in the domain of volume-conserving mechanical perturbations, it also highlights the importance of the nature of underlying microscopic flows in controlling the bulk stress relaxation, affecting the Kovacs-like memory effect in amorphous materials.","PeriodicalId":103,"journal":{"name":"Soft Matter","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143727265","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

Sarcophytonin H: a novel endoperoxide-containing dihydrofuranocembranoid from an octocoral Sarcophyton species†

IF 3.9 3区化学

RSC Advances Pub Date : 2025-03-28 DOI: 10.1039/D5RA00595G

Thi Uyen Nhi Nguyen, Chen-Chen Kung, Chia-Ching Liaw, Yu-Chi Lin, You-Ying Chen, Li-Guo Zheng, Su-Ying Chien, Chi-Chieh Tang, Jing-Ru Weng, Jui-Hsin Su, Jyh-Horng Sheu and Ping-Jyun Sung

引用次数: 0