Chinese Journal of Chemistry最新文献

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Precursor-Mediated Direct Growth of Defect-Rich Hierarchical Nanocarbons for Electrocatalytic Hydrogen Peroxide Production† 以前驱体为介质直接生长富缺陷分层纳米碳,用于电催化过氧化氢生产†。
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-13 DOI: 10.1002/cjoc.202400455
Xiaoting Sun, Tiantian Lu, Jialei Chen, Youzeng Li, Shan Chen, Xuelong Liao, Ying Liu, Runyu Lv, Huan Wang
{"title":"Precursor-Mediated Direct Growth of Defect-Rich Hierarchical Nanocarbons for Electrocatalytic Hydrogen Peroxide Production†","authors":"Xiaoting Sun,&nbsp;Tiantian Lu,&nbsp;Jialei Chen,&nbsp;Youzeng Li,&nbsp;Shan Chen,&nbsp;Xuelong Liao,&nbsp;Ying Liu,&nbsp;Runyu Lv,&nbsp;Huan Wang","doi":"10.1002/cjoc.202400455","DOIUrl":"10.1002/cjoc.202400455","url":null,"abstract":"<div>\u0000 \u0000 <p>Carbon-based nanomaterials show great potential in selective electrochemical oxygen reduction reaction (ORR) through two-electron (2e<sup>−</sup>) pathway for H<sub>2</sub>O<sub>2</sub> production, which provides an eco-friendly alternative to industrial energy-intensive anthraquinone process. However, it still remains challenging to directly construct topological defects, which makes it difficult to study the working mechanism on 2e<sup>–</sup> ORR. Herein, we propose a precursor-mediated chemical vapor deposition (CVD) approach for direct growth of topological defect-rich hierarchical nanocarbons. Boric acid (H<sub>3</sub>BO<sub>3</sub>) is introduced into the precursor for disturbing the nucleation and growth through decomposing B-containing species, which can <i>in situ</i> induce the formation of pentagon defects. The topological defect is found to be capable of introducing lattice strain, which can modify the electronic structure of nanocarbons and promote the key intermediate (*OOH) formation, thus greatly enhancing the 2e<sup>–</sup> ORR performance. Experimentally, the 2e<sup>–</sup> ORR selectivity shows a positive correlation to the topological defect density, where the average H<sub>2</sub>O<sub>2</sub> selectivity reaches above 90% over a wide potential range with optimized concentration of H<sub>3</sub>BO<sub>3</sub> as mediator. Moreover, in a flow cell, the hierarchical nanocarbons achieve a high H<sub>2</sub>O<sub>2</sub> production rate of 998 mmol·g<sub>catalyst</sub><sup>−1</sup>·h<sup>−1</sup> over 20 h of continuous electrocatalysis with stable current density (&gt;100 mA·cm<sup>–2</sup>) and Faradaic efficiency (&gt; 90%). This work provides a straightforward method for the synthesis of active metal-free carbon-based catalyst for sustainable H<sub>2</sub>O<sub>2</sub> production.</p>\u0000 <p>\u0000 </p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"3113-3121"},"PeriodicalIF":5.5,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195545","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
Formate-Mediated Synthesis of β-Hydroxysulfides from Olefins and Thiosulfonates via EDA Complex Strategy under Visible Light Irradiation in Air 在空气中可见光辐照下,通过 EDA 复合物策略,以烯烃和硫代磺酸盐为原料,合成甲醛介导的 β-羟基硫化物
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-13 DOI: 10.1002/cjoc.202400530
Qing Shen, Xiaoyan Peng, Jiahong Sui, Min Peng, Xiangwei Liu, Hezhong Jiang, Rui Tan, Min Zhou, Jiahong Li
{"title":"Formate-Mediated Synthesis of β-Hydroxysulfides from Olefins and Thiosulfonates via EDA Complex Strategy under Visible Light Irradiation in Air","authors":"Qing Shen,&nbsp;Xiaoyan Peng,&nbsp;Jiahong Sui,&nbsp;Min Peng,&nbsp;Xiangwei Liu,&nbsp;Hezhong Jiang,&nbsp;Rui Tan,&nbsp;Min Zhou,&nbsp;Jiahong Li","doi":"10.1002/cjoc.202400530","DOIUrl":"10.1002/cjoc.202400530","url":null,"abstract":"<div>\u0000 \u0000 <p>A visible-light-induced and efficient one-pot synthesis of <i>β</i>-hydroxysulfides from olefins, thiosulfonates and HCOOCs using an EDA complex strategy under air atmosphere at room temperature has been disclosed. A plausible radical involved mechanism is proposed. During the reaction process, formates play a crucial role: first, as donors in the EDA complex; second, as providers of the hydrogen source; and third, by generating CO<sub>2</sub><sup>•–</sup> to reduce peroxide intermediates, leading to the formation of <i>β</i>-hydroxysulfides. In contrast to the previously reported thiol-oxygen co-oxidation reactions, this simple and sustainable approach features mild reaction conditions, operational simplicity, odorless and excellent functional group tolerance.</p>\u0000 <p>\u0000 </p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"3129-3134"},"PeriodicalIF":5.5,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195547","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
Deracemization of Sulfoxides Combining Electrocatalysis and Biocatalysis 结合电催化和生物催化的硫氧化物脱芳烃技术
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-13 DOI: 10.1002/cjoc.202400567
Xinyu Duan, Dong Cui, Mengdi Wang, Yifan Tian, Jianan Shi, Yixue Wu, Shuang Liu, Zejie Zhu, Jian Xu
{"title":"Deracemization of Sulfoxides Combining Electrocatalysis and Biocatalysis","authors":"Xinyu Duan,&nbsp;Dong Cui,&nbsp;Mengdi Wang,&nbsp;Yifan Tian,&nbsp;Jianan Shi,&nbsp;Yixue Wu,&nbsp;Shuang Liu,&nbsp;Zejie Zhu,&nbsp;Jian Xu","doi":"10.1002/cjoc.202400567","DOIUrl":"10.1002/cjoc.202400567","url":null,"abstract":"<div>\u0000 \u0000 <p>The concurrent implementation of cascade reactions that combine biocatalysis and chemocatalysis is a challenging undertaking. Electrocatalysis provides versatile catalytic abilities and allows for mild reaction conditions, offering the potential for designing concurrent chemoenzymatic cascade reactions. The research on bioelectrocatalysis has primarily concentrated on utilizing electrocatalysis to achieve cofactor regeneration of enzymes. In contrast with previous reports, herein, we developed a deracemization strategy involving the concurrent combination of biocatalytic reduction and anodic oxidation in an undivided cell to achieve chiral sulfoxides, demonstrating the good compatibility. We anticipate this study will offer an alternative pathway for the design of the cascade reaction combined with electrocatalysis and biocatalysis.</p>\u0000 <p>\u0000 </p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"3107-3112"},"PeriodicalIF":5.5,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195544","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
Photo-Excited Switching and Enhancement of Dielectric Properties in Two-Dimensional Double Perovskite Phase Transition Thin Films 二维双包晶相变薄膜中的光激发开关和介电性质的增强
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-13 DOI: 10.1002/cjoc.202400529
Linjie Wei, Yi Liu, Tian Yang, Hao Rong, Xianmei Zhao, Jingtian Zhang, Junhua Luo, Zhihua Sun
{"title":"Photo-Excited Switching and Enhancement of Dielectric Properties in Two-Dimensional Double Perovskite Phase Transition Thin Films","authors":"Linjie Wei,&nbsp;Yi Liu,&nbsp;Tian Yang,&nbsp;Hao Rong,&nbsp;Xianmei Zhao,&nbsp;Jingtian Zhang,&nbsp;Junhua Luo,&nbsp;Zhihua Sun","doi":"10.1002/cjoc.202400529","DOIUrl":"10.1002/cjoc.202400529","url":null,"abstract":"<div>\u0000 \u0000 <p>Optical controlling of solid-sate electric properties is emerging as a non-contact and nondestructive avenue to optimize the physical properties of electronic and optoelectronic devices. In term of strong light-material coupling, two-dimensional (2D) double perovskites hold great prospects to create photo-dielectric activities for high-performance device applications. Here, we have achieved the photo-excited switching and enhancement of dielectric properties in the orientational thin films of a 2D double perovskite, (C<sub>4</sub>H<sub>12</sub>N)<sub>4</sub>AgBiI<sub>8</sub> (<b>1</b>, where C<sub>4</sub>H<sub>9</sub>NH<sub>3</sub><sup>+</sup> is isobutylammonium). It undergoes a structural phase transition at 384 K (<i>T</i><sub>c</sub>), triggered by the dynamic ordering of organic cations and tilting motion of isometallic perovskite sheets. Most notably, the orientational thin films of <b>1</b> are extremely sensitive to light illumination, of which the dielectric constants can be facilely photo-switched between the low- and high-states. During this photo-switching process, the dielectric constants are enhanced with a magnitude up to ~350% under 405 nm, far beyond most of the inorganic phase transition counterparts. In addition, this photo-excited switching and enhancement of dielectric response exhibits an operational stability with superior anti-fatigue characteristics. Our work opens up a potential avenue for assembling high-performance optoelectronic devices with the controllable physical properties.</p>\u0000 <p>\u0000 </p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"3122-3128"},"PeriodicalIF":5.5,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142195546","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
Borane-Catalyzed Asymmetric Reduction of 2-Alkylpyridines† 硼烷催化的 2-烷基吡啶†的不对称还原
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-08 DOI: 10.1002/cjoc.202400671
Heng Luo, Zhao-Ying Yang, Ming Zhang, Xiao-Chen Wang
{"title":"Borane-Catalyzed Asymmetric Reduction of 2-Alkylpyridines†","authors":"Heng Luo,&nbsp;Zhao-Ying Yang,&nbsp;Ming Zhang,&nbsp;Xiao-Chen Wang","doi":"10.1002/cjoc.202400671","DOIUrl":"10.1002/cjoc.202400671","url":null,"abstract":"<div>\u0000 \u0000 <p>Herein, a method for the enantioselective reduction of unprotected 2-alkylpyridines is reported for the first time. By using pinacolborane and an amide as reducing agents, a large number of 2-alkylpiperidines were synthesized with high yields and excellent enantioselectivities via a cascade process involving 1,4-hydroboration and subsequent transfer hydrogenation. The resulting products can be easily converted to natural alkaloids.</p>\u0000 <p>\u0000 </p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"3088-3092"},"PeriodicalIF":5.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929090","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
Synthesis of Three-Dimensional Chiral Covalent Organic Frameworks Using Surfactant as Inducer in Water 以表面活性剂为诱导剂在水中合成三维手性共价有机框架
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-08 DOI: 10.1002/cjoc.202400552
Meiying Huang, Zhipeng Zhou, Xin Dong, Yuyao Li, Yonghang Yang, Changye Zhan, Jiaxing Lu, Xiaoshu Wei, Yuexian Hong, Weiqi Cheng, Wei Liu, Zhongke Yuan, Xudong Chen, Zhikun Zheng
{"title":"Synthesis of Three-Dimensional Chiral Covalent Organic Frameworks Using Surfactant as Inducer in Water","authors":"Meiying Huang,&nbsp;Zhipeng Zhou,&nbsp;Xin Dong,&nbsp;Yuyao Li,&nbsp;Yonghang Yang,&nbsp;Changye Zhan,&nbsp;Jiaxing Lu,&nbsp;Xiaoshu Wei,&nbsp;Yuexian Hong,&nbsp;Weiqi Cheng,&nbsp;Wei Liu,&nbsp;Zhongke Yuan,&nbsp;Xudong Chen,&nbsp;Zhikun Zheng","doi":"10.1002/cjoc.202400552","DOIUrl":"10.1002/cjoc.202400552","url":null,"abstract":"<div>\u0000 \u0000 <p>Chiral covalent organic frameworks (COFs) have shown promising applications in asymmetric catalysis, enantiomer separation and chiral recognition due to their tunable structures and permanent porosity. Currently, synthesis of chiral COFs mainly relies on direct- synthesis method which requires asymmetric monomers to polymerize and crystallize with symmetric monomers and post-synthesis method which has been greatly limited to having complete reactions with the micro-/meso-sized pores of COFs. Recently, the synthesis of two-dimensional COFs by covalent replacement of chiral competitor has been reported. Herein, we present the synthesis of three types of 3D COFs with tunable chirality using chiral amino acid derivative surfactant as inducer in water under ambient conditions. The hydrogen bonds and electrostatic interactions between amino acid derivative surfactant and monomers as well as their precursors facilitate the transfer of the chirality.</p>\u0000 <p>\u0000 </p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"3093-3098"},"PeriodicalIF":5.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141935585","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
A GSH-Responsive Immune-Stimulating Polypeptide Hydrogel Loaded with Chemotherapeutics, IDO Inhibitor and Immune Checkpoint Blocking Antibody for Enhanced Anti-Tumor Chemo-Immunotherapy 富含化疗药物、IDO 抑制剂和免疫检查点阻断抗体的 GSH 反应性免疫刺激多肽水凝胶,用于增强抗肿瘤化疗-免疫疗法的效果
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-08 DOI: 10.1002/cjoc.202400475
Junfeng Ding, Tianran Wang, Yan Rong, Chaoliang He, Xuesi Chen
{"title":"A GSH-Responsive Immune-Stimulating Polypeptide Hydrogel Loaded with Chemotherapeutics, IDO Inhibitor and Immune Checkpoint Blocking Antibody for Enhanced Anti-Tumor Chemo-Immunotherapy","authors":"Junfeng Ding,&nbsp;Tianran Wang,&nbsp;Yan Rong,&nbsp;Chaoliang He,&nbsp;Xuesi Chen","doi":"10.1002/cjoc.202400475","DOIUrl":"10.1002/cjoc.202400475","url":null,"abstract":"<div>\u0000 \u0000 <p>Due to the immunosuppressive tumor microenvironment (TME), T cells are usually inactivated and tend to differentiate into regulatory T cells (Tregs) in the tumor tissues, which seriously hinders the anti-tumor efficiency of immunotherapy. In this study, an immune-stimulating polypeptide hydrogel conjugated with an indoleamine-2,3-dioxygenase (IDO) inhibitor, 1-methyl-<i>D</i>-tryptophan (D1MT), through a glutathione (GSH)-responsive spacer was developed as an immunotherapy platform capable of regulating the TME. A combined immunotherapy system was further constructed through encapsulating doxorubicin (Dox) and immune checkpoint blocking antibody targeting programmed cell death protein 1 (aPD-1) in the hydrogel. Dox released from the hydrogel could cause the immunogenic cell death (ICD) of tumor cells and induce the maturation of antigen presenting cells (APCs). After intratumoral injection, the multiple agent-loaded hydrogel elicited effective anti-tumor immunity in mice bearing B16F10 melanoma. Moreover, compared with the control hydrogel without D1MT, the immune-stimulating hydrogel showed better efficiency in improving the immunosuppressive TME with increased number of activated T cells and reduced number of Tregs. Therefore, the immune-stimulating hydrogel has great potential as a stimuli-responsive platform for regulating suppressive TME and enhanced anti-tumor chemo-immunotherapy.</p>\u0000 <p></p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"2957-2969"},"PeriodicalIF":5.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141928889","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
Palladium-Catalyzed Direct B—H Oxygenation: Facile Synthesis of o-Carboranofuranones† 钯催化的直接 B-H 氧合反应:邻硼烷基呋喃酮的简便合成†...
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-08 DOI: 10.1002/cjoc.202400571
Chenyang Guo, Zaozao Qiu, Zuowei Xie
{"title":"Palladium-Catalyzed Direct B—H Oxygenation: Facile Synthesis of o-Carboranofuranones†","authors":"Chenyang Guo,&nbsp;Zaozao Qiu,&nbsp;Zuowei Xie","doi":"10.1002/cjoc.202400571","DOIUrl":"10.1002/cjoc.202400571","url":null,"abstract":"<div>\u0000 \u0000 <p>Recent advances in transition metal-catalyzed <i>o</i>-carborane B—H activation have led to the rapid development of various methodologies for cage boron functionalization. For catalytic cage B—H acyloxylation, intermolecular oxygenation gave products with different regioselectivities (B(3)-, B(4)-, and B(8,9)-selectivities). Herein, an efficient palladium-catalyzed direct cage B(4)–H oxygenation of <i>o</i>-carboranylacetic acids has been achieved, where the carboxylic group serves as not only a directing group, but also a coupling partner. A wide range of substituted <i>o</i>-carboranylacetic acids have been cyclized via the formation of B(4)−O bond to give the corresponding γ-lactones in modest to excellent yields. A Pd(IV) intermediate is proposed to be involved in the catalytic cycle. This work offers valuable references for the BH/OH dehydrocoupling reactions under mild conditions to produce carborane-featuring functional molecules.</p>\u0000 <p>\u0000 </p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"3083-3087"},"PeriodicalIF":5.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141935586","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
Sandwich-Type Single-Molecule Magnets Complexes of Er(III) with Ansa-Cyclooctatetraenyl Ligands† 安萨-环辛四烯配体的 Er(III)三明治式单分子磁性络合物†
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-08 DOI: 10.1002/cjoc.202400600
You-Song Ding, Qi-Wei Chen, Jia-Qi Huang, Xiao-Fei Zhu, Zhiping Zheng
{"title":"Sandwich-Type Single-Molecule Magnets Complexes of Er(III) with Ansa-Cyclooctatetraenyl Ligands†","authors":"You-Song Ding,&nbsp;Qi-Wei Chen,&nbsp;Jia-Qi Huang,&nbsp;Xiao-Fei Zhu,&nbsp;Zhiping Zheng","doi":"10.1002/cjoc.202400600","DOIUrl":"10.1002/cjoc.202400600","url":null,"abstract":"<div>\u0000 \u0000 <p>Many sandwich-type lanthanide complexes show extremely high energy barriers (<i>U</i><sub>eff</sub>) for the reversal of magnetization and high blocking temperatures, being the star molecules in the research area of single-molecule magnets. Herein, the preparation, structural determination, and magnetic property studies of two <i>ansa</i>-bridged Er-COT (COT = cyclooctatetraenyl dianion) complexes [KDME<sub>2</sub>][Er((η<sup>8</sup>-COT-Si<sup>Me2</sup>)<sub>2</sub>O)] (<b>1</b>) and [KDME<sub>2</sub>][Er((η<sup>8</sup>-COT-Si<sup><i>i</i>Pr2</sup>)<sub>2</sub>O)]K[Er((η<sup>8</sup>-COT-Si<sup><i>i</i>Pr2</sup>)<sub>2</sub>O)] (<b>2</b>) were reported. The Er(III) ions in both complexes are sandwiched by two COT rings which are <i>ansa</i>-bridged by a [Si-O-Si] group. Magnetic studies reveal both complexes display slow magnetic relaxations with comparable energy barriers (228(5) K for <b>1</b>, and 196(4) K for <b>2</b>) and blocking temperatures (10.5 K for both complexes). The difference in the relaxation times (<i>τ</i>) for the two complexes was studied in details: different molecular vibrations induced by the substituents are the main reason for <i>τ</i> for <b>1</b> being about 10 times longer than for <b>2</b> at the same temperature above 10 K, while the quantum tunnelling of magnetization relaxation time (<i>τ</i><sub>QTM</sub>) for <b>2</b> is about 10 times longer than for <b>1</b> below 8 K, probably owing to the different dipolar interactions. Further rearrangement of molecular network with such <i>ansa</i>-bridged SMMs is promising to design molecular magnetic materials with enhanced properties or new properties.</p>\u0000 <p>\u0000 </p>\u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"42 23","pages":"3099-3106"},"PeriodicalIF":5.5,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141926801","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
Metal-Decorated Porous Organic Polymers: Bridged the Gap between Organic and Inorganic Scaffolds† 金属装饰多孔有机聚合物:弥合有机与无机支架之间的差距†...
IF 5.5 1区 化学
Chinese Journal of Chemistry Pub Date : 2024-08-08 DOI: 10.1002/cjoc.202400386
Zhu Gao, Yufei Liu, Shaofei Wu, Juntao Tang, Kuanyu Yuan, Chunyue Pan, Guipeng Yu
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