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IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2025-01-01 DOI: 10.1016/S1001-8417(24)01148-3

引用次数: 0

Functional macrocyclic arenes with active binding sites inside cavity for biomimetic molecular recognition

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-26 DOI: 10.1016/j.cclet.2024.110806

Xixian Sun , Shengke Li , Ruibing Wang , Leyong Wang

引用次数: 0

Silica coating of quantum dots and their applications in optoelectronic fields

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-26 DOI: 10.1016/j.cclet.2024.110798

Siting Cai , Xiang Chen , Shuli Wang , Xinqin Liao , Zhong Chen , Yue Lin

{"title":"Silica coating of quantum dots and their applications in optoelectronic fields","authors":"Siting Cai , Xiang Chen , Shuli Wang , Xinqin Liao , Zhong Chen , Yue Lin","doi":"10.1016/j.cclet.2024.110798","DOIUrl":"10.1016/j.cclet.2024.110798","url":null,"abstract":"<div><div>Quantum dots (QDs), a type of nanoscale semiconductor material with unique optical and electrical properties like adjustable emission and high photoluminescence quantum yields, are suitable for applications in optoelectronics. However, QDs are typically degraded under humid and high-temperature circumstances, greatly limiting their practical value. Coating the QD surface with an inorganic silica layer is a feasible method for improving stability and endurance in a variety of applications. This paper comprehensively reviews silica coating methodologies on QD surfaces and explores their applications in optoelectronic domains. Firstly, the paper provides mainstream silica coating approaches, which can be divided into two categories: <em>in-situ</em> hydrolysis of silylating reagents on QD surfaces and template techniques for encapsulation QDs. Subsequently, the recent applications of the silica-coated QDs on optoelectronic fields including light-emitting diodes, solar cells, photodetectors were discussed. Finally, it reviews recent advances in silica-coated QD technology and prospects for future applications.</div></div>","PeriodicalId":10088,"journal":{"name":"Chinese Chemical Letters","volume":"36 6","pages":"Article 110798"},"PeriodicalIF":9.4,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Nonmetallic phosphorus alloying to regulate the oxygen reduction mechanisms of platinum catalyst

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-21 DOI: 10.1016/j.cclet.2024.110789

Yizhe Chen , Yuzhou Jiao , Liangyu Sun , Cheng Yuan , Qian Shen , Peng Li , Shiming Zhang , Jiujun Zhang

{"title":"Nonmetallic phosphorus alloying to regulate the oxygen reduction mechanisms of platinum catalyst","authors":"Yizhe Chen , Yuzhou Jiao , Liangyu Sun , Cheng Yuan , Qian Shen , Peng Li , Shiming Zhang , Jiujun Zhang","doi":"10.1016/j.cclet.2024.110789","DOIUrl":"10.1016/j.cclet.2024.110789","url":null,"abstract":"<div><div>Platinum (Pt) nanoparticle catalysts remain the most popular cathode materials for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. Non-metallic alloying of Pt has become an emerging strategy to improve electrocatalytic performance, however, the electrocatalytic ORR mechanisms still need to be understood for further improvement toward practical application. Herein, a rapid microwave reduction method is employed for alloying phosphorous (P) into Pt to form a carbon supported phosphorus-alloyed Pt nanoparticle catalyst (P-Pt/C), which demonstrates the ability to replace commercial Pt/C. By a combination of density functional theory calculations and <em>in-situ</em> electrochemical Raman spectroscopy, the regulation role of P-alloying in the electrocatalytic mechanisms is revealed. It is found that the nearby Pt atoms can convert the ORR pathway from associative one to dissociative one, exhibiting a spontaneous dissociation of *OOH intermediate to *OH and *O species as well as a change of potential determining step to *O protonation. Furthermore, the strategy of large-scale economic synthesis of such alloying Pt-based catalyst is also established, demonstrated by a gram-level synthesis per batch. This study puts insight into the electrocatalytic ORR fundamentals of Pt-alloying with non-metals and provides a basis for the reasonable design and synthesis of efficient nonmetals-alloyed Pt catalysts.</div></div>","PeriodicalId":10088,"journal":{"name":"Chinese Chemical Letters","volume":"36 4","pages":"Article 110789"},"PeriodicalIF":9.4,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Visible light/copper catalysis enabled radial type ring-opening of sulfonium salts

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-19 DOI: 10.1016/j.cclet.2024.110787

Rong-Nan Yi , Wei-Min He

引用次数: 0

Facile synthesis of all-carbon fluorinated backbone polymers containing sulfide linkage as proton exchange membranes for fuel cells 简便合成含硫化物连接的全碳氟化骨架聚合物作为燃料电池的质子交换膜

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-13 DOI: 10.1016/j.cclet.2024.110763

Yuetong Gao, Tong Mu, Xinyue Hu, Yang Pang, Chengji Zhao

{"title":"Facile synthesis of all-carbon fluorinated backbone polymers containing sulfide linkage as proton exchange membranes for fuel cells","authors":"Yuetong Gao, Tong Mu, Xinyue Hu, Yang Pang, Chengji Zhao","doi":"10.1016/j.cclet.2024.110763","DOIUrl":"10.1016/j.cclet.2024.110763","url":null,"abstract":"<div><div>Aryl-ether bonds are facile to attack by oxidizing radicals, thus stimulating the exploitation of ether-free polymers as proton exchange membranes (PEMs) for the long-lasting operation of fuel cells. In this study, a novel class of PEMs derived from all-carbon fluorinated backbone polymers containing sulfide-linked alkyl sulfonic acid side chains have been developed through a straightforward and effective synthetic procedure. The sulfide-linked alkyl sulfonate groups were tethered to the poly(triphenylene pentafluoro phenyl) backbone through a quantified and site-specific <em>para</em>-fluoro-thiol click reaction. Owing to the existence of obvious phase separation morphology between hydrophobic main chain and hydrophilic sulfonate groups in the side chains, resulting PEMs demonstrated favorable proton conductivity of 142.5 mS/cm at 80 °C, while maintaining excellent dimensional stability with an in-plane swelling ratio of <17% as well as a through-plane swelling ratio of <25%. They also exhibit elevated thermal decomposition temperatures (<em>T</em><sub>d5</sub><sub>%</sub> exceeding 300 °C) alongside high tensile strength (>50 MPa). Furthermore, the ether-free full-carbon fluorinated main chain and the -S- group in the side chain, which serves as an effective free-radical scavenger, providing good chemical stability during Fenton's test. The PEMs achieved a maximum power density of 407 mW/cm<sup>2</sup> in a single H<sub>2</sub>/air fuel cell, and an open-circuit voltage decline rate of 0.275 mV/h in a durability test at 30% RH and 80 °C. Concurrently, the hydrogen crossover current density is only 1/3 of that of Nafion 212. These findings reveal that the resulted PEMs display considerable antioxidative properties along with commendable performance, with prospective applications in proton exchange membrane fuel cells.</div></div>","PeriodicalId":10088,"journal":{"name":"Chinese Chemical Letters","volume":"36 6","pages":"Article 110763"},"PeriodicalIF":9.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Thermally robust bis(imino)pyridyl iron catalysts for ethylene polymerization: Synergy effects of weak π-π interaction, steric bulk, and electronic tuning

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-13 DOI: 10.1016/j.cclet.2024.110762

Heng Gao, Zhaocong Cheng, Guangshui Tu, Zonglin Qiu, Xieyi Xiao, Haotian Zhou, Handou Zheng, Haiyang Gao

引用次数: 0

Modified triphenylamine donors with shallower HOMO energy levels to construct long-wavelength TADF emitters of efficient organic light-emitting diodes 具有较浅 HOMO 能级的改良三苯胺供体，用于构建高效有机发光二极管的长波长 TADF 发射器

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-13 DOI: 10.1016/j.cclet.2024.110760

Hao Zhuo , Ming Zhang , Hengyuan Zhang , Hui Lin , Gang Yang , Silu Tao , Caijun Zheng , Xiaohong Zhang

{"title":"Modified triphenylamine donors with shallower HOMO energy levels to construct long-wavelength TADF emitters of efficient organic light-emitting diodes","authors":"Hao Zhuo , Ming Zhang , Hengyuan Zhang , Hui Lin , Gang Yang , Silu Tao , Caijun Zheng , Xiaohong Zhang","doi":"10.1016/j.cclet.2024.110760","DOIUrl":"10.1016/j.cclet.2024.110760","url":null,"abstract":"<div><div>Triphenylamine (TPA) is the most promising donor fragment for the construction of long-wavelength thermally activated delayed fluorescence (TADF) emitters owing to its suitable dihedral angle that could enhance radiative decay to compete with the serious non-radiative decay. However, the moderate electron-donating capacity of TPA seriously limits the selection of acceptor for constructing long-wavelength TADF emitters with narrow bandgaps. To address this issue, in this work, the peripheral benzene of TPA was replaced with 1,4-benzodioxane and anisole to obtain two new electron-donating units <em>N</em>-(2,3-dihydrobenzo[<em>b</em>][1,4]dioxin-6-yl)-<em>N</em>-phenyl-2,3-dihydrobenzo[<em>b</em>][1,4]dioxin-6-amine (TPADBO, −5.02 eV) and 4‑methoxy-<em>N</em>-(4-methoxyphenyl)-<em>N</em>-phenylaniline (TPAMO, −5.00 eV), which possess much shallower highest occupied molecule orbital (HOMO) energy levels than the prototype TPA (−5.33 eV). Based on TPA and the modified TPA donor fragments, three TADF emitters were designed and synthesized, namely Py-TPA, Py-TPADBO and Py-TPAMO, with the same acceptor fragment 12-(2,6-diisopropylphenyl)pyrido[2′,3′:5,6]pyrazino[2,3-<em>f</em>][1,10]phenanthroline (Py). Among them, Py-TPAMO exhibits the highest photoluminescence quantum yield of 78.4 % and the smallest singlet-triplet energy gap, which is because the introduction of anisole does not cause significant molecule deformation for the excited Py-TPAMO. And Py-TPAMO-based OLEDs successfully realize a maximum external quantum efficiency of 25.5 % with the emission peak at 605 nm. This work provides a series of candidate of donor fragments for the development of efficient long-wavelength TADF emitters.</div></div>","PeriodicalId":10088,"journal":{"name":"Chinese Chemical Letters","volume":"36 5","pages":"Article 110760"},"PeriodicalIF":9.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Supramolecular-orchestrated carrier-free chemodynamic synergists with augmented oxidative damage for potentiated cancer therapy

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-13 DOI: 10.1016/j.cclet.2024.110765

Xiaoyi Meng , Xinyue Sun , Zhaogang Sun , Yue Cheng , Yong Wang , Jun Ye , Yin Xiao , Hongqian Chu

{"title":"Supramolecular-orchestrated carrier-free chemodynamic synergists with augmented oxidative damage for potentiated cancer therapy","authors":"Xiaoyi Meng , Xinyue Sun , Zhaogang Sun , Yue Cheng , Yong Wang , Jun Ye , Yin Xiao , Hongqian Chu","doi":"10.1016/j.cclet.2024.110765","DOIUrl":"10.1016/j.cclet.2024.110765","url":null,"abstract":"<div><div>Metal ions trigger Fenton/Fenton-like reactions, generating highly toxic hydroxyl radicals (<sup>•</sup>OH) for chemodynamic therapy (CDT), which is crucial in inducing lethal oxidative DNA damage and subsequent cell apoptosis. However, tumor cells can counteract this damage through repair pathways, particularly MutT homolog 1 (MTH1) protein attenuation of oxidative DNA damage. Suppression of MTH1 can enhance CDT efficacy, therefore, orderly integrating Fenton/Fenton-like agents with an MTH1 inhibitor is expected to significantly augment CDT effectiveness. Carrier-free CuTH@CD, self-assembled through the supramolecular orchestration of <em>γ</em>-cyclodextrin (<em>γ</em>-CD) with Cu<sup>2+</sup> and the MTH1 inhibitor TH588, effectively overcoming tumor resistance by greatly amplifying oxidative damage capability. Without additional carriers and mediated by multiple supramolecular regulatory effects, CuTH@CD enables high drug loading content, stability, and uniform size distribution. Upon internalization by tumor cells, CuTH@CD invalidates repair pathways through Cu<sup>2+</sup>-mediated glutathione (GSH) depletion and TH588-mediated MTH1 inhibition. Meanwhile, both generated Cu<sup>+</sup> ions and existing ones within the nanoassembly initiate a Fenton-like reaction, leading to the accumulation of <sup>•</sup>OH. This strategy enhances CDT efficiency with minimal side effects, improving oxidative damage potency and advancing self-delivery nanoplatforms for developing effective chemodynamic tumor therapies.</div></div>","PeriodicalId":10088,"journal":{"name":"Chinese Chemical Letters","volume":"36 5","pages":"Article 110765"},"PeriodicalIF":9.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Stacking solid-state electrolyte and aluminum pellets for anode-free solid-state batteries

IF 9.4 1区化学

Chinese Chemical Letters Pub Date : 2024-12-13 DOI: 10.1016/j.cclet.2024.110764

Jing Guo

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