Bulletin of the Korean Chemical Society最新文献

{"title":"Post-synthetic modifications in metal–organic frameworks for high proton conductivity","authors":"Amitosh Sharma,&nbsp;Seonghwan Lee,&nbsp;Jaewoong Lim,&nbsp;Myoung Soo Lah","doi":"10.1002/bkcs.12801","DOIUrl":"10.1002/bkcs.12801","url":null,"abstract":"<p>A myriad of metal ions and organic linkers can be used to produce metal–organic frameworks (MOFs) with varied functionalities, porosities, and dimensionalities. Such diversity has garnered significant research interest, particularly in leveraging MOFs as proton conductors for fuel cells. One effective approach involves introducing guest molecules into MOF pores. These molecules serve either as proton carriers or as proton-conducting media through potential hydrogen bonding networks. This review offers an organized overview of key methodologies historically employed to achieve superprotonic conductivity in MOFs. The article systematically categorizes these tactics into three primary groups: guest molecule encapsulation, modulation at metal-coordination sites, and ligand functionalization. We succinctly discuss the roles of proton carriers, conducting media, and the overall MOF framework, emphasizing the significance of each strategy's application. In conclusion, we provide insights into the future development of MOFs as proton conductors, rooted in the categorization and conceptual understanding of these strategies.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136348400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One pot production of Co core/carbon shell materials and their electrocatalytic properties","authors":"Yunseok Shin,&nbsp;Sungjin Park","doi":"10.1002/bkcs.12798","DOIUrl":"10.1002/bkcs.12798","url":null,"abstract":"<p>The oxygen reduction reaction (ORR) is a kinetically sluggish reaction because it requires the transfer of four electrons. In this work, one-pot process involving thermal treatment of Co(II) acetylacetonate is developed. The resulting core–shell material (Co@C-800) consists of metallic Co cores encapsulated by carbon-based layered shells. Morphological analysis reveals the core–shell structures, with core particles surrounded by carbon networks. Chemical characterization using various spectroscopic techniques indicates the presence of metallic Co as the major component in Co@C-800, with minor Co species exhibiting higher oxidation states. Raman spectroscopy confirms the formation of sp2-hybridized carbon shells. Co@C-800 displays efficient electrocatalytic ORR performance, evidenced by high onset and half-wave potentials. The excellent durability and stability of Co@C-800, demonstrated through resistance to methanol poisoning and cyclic testing, suggest the potential of core–shell materials as a practical electrocatalyst.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136348000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-dimensional Ti3C2 MXene for photocatalytic hydrogen production: A review","authors":"B. Shalini Reghunath,&nbsp;Sruthi Rajasekaran,&nbsp;Sandra Mathew,&nbsp;Dephan Pinheiro,&nbsp;Sunaja Devi K. R,&nbsp;Sieon Jung,&nbsp;Theerthagiri Jayaraman,&nbsp;Myong Yong Choi","doi":"10.1002/bkcs.12783","DOIUrl":"10.1002/bkcs.12783","url":null,"abstract":"<p>This study focuses on the utilization of two-dimensional Ti₃C₂ MXene as a catalyst for photocatalytic hydrogen production. MXenes, a class of transition metal carbides/nitrides, exhibit exceptional properties conducive to enhancing photocatalytic reactions. This research explores the performance of Ti₃C₂ MXene as a cocatalyst in photocatalytic systems, aiming to improve charge separation, inhibit recombination, and facilitate efficient hydrogen evolution from water under light irradiation. The synthesis methods, catalyst-loading strategies, and overall photocatalytic mechanisms are investigated, shedding light on the potential of Ti₃C₂ MXene as a promising material for advancing hydrogen production through sustainable means.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135867975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbonylative ring expansion of oxetane into γ-butyrolactone using bimetallic cobaltate catalysts: Insight into the deactivation mechanism","authors":"Vinothkumar Ganesan,&nbsp;Sungho Yoon","doi":"10.1002/bkcs.12789","DOIUrl":"10.1002/bkcs.12789","url":null,"abstract":"<p>γ-butyrolactones and their derivatives serve as the fundamental building blocks for a wide range of biologically significant and synthetically challenging natural products, which find extensive applications in various high-demand chemicals. In this study, we have successfully established a facile and atom-efficient synthesis of γ-butyrolactones through the carbonylative ring expansion of oxetanes. We employed both homogeneous and heterogenized bimetallic catalysts ([HCP-TPPM][Co(CO)₄], where HCP refers to hyper cross-linked polymer and TPP denotes tetraphenylporphyrin, with M = Cr³⁺ and Al³⁺). While the homogeneous catalysts exhibited remarkable activity, the heterogeneous catalysts offered the distinct advantages of facilitating product separation and enabling catalyst recycling. Notably, during the catalyst recycling studies, we observed a decrease in catalytic activity attributed to cobaltate leaching. The hypothesis of cobaltate leaching through β-hydrogen elimination was validated by comparative studies using substrates with and without β-hydrogen in both batch and continuous flow catalytic processes.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135321276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boron- and nitrogen-embedded blue multi-resonance emitters with low triplet energy","authors":"Hanif Mubarok,&nbsp;Taehwan Lee,&nbsp;Jaehoon Jung,&nbsp;Min Hyung Lee","doi":"10.1002/bkcs.12793","DOIUrl":"10.1002/bkcs.12793","url":null,"abstract":"<p>B,N-doped multi-resonance (MR) thermally activated delayed fluorescence (TADF) emitters are of significant interest for realizing the high efficiency and remarkable color purity of optoelectronic devices. Due to their moderate singlet-triplet energy gap, managing triplet state (T₁) energy is important to enhance the performance of these devices. Herein, polycyclic aromatic hydrocarbons (PAHs), such as pyrene and anthracene, are appended to the <i>t</i>-DABNA structure, resulting in <i>t</i>-DABNA-PAH compounds, namely <i>t</i>-DABNA-pyr and <i>t</i>-DABNA-ant. Both compounds display sky-blue fluorescence which lacks TADF characteristics while preserving high photoluminescence quantum yield (PLQY) and high color purity. The compounds possess low T₁ energy (~2.0 eV), which is advantageous for suppressing the accumulation of undesirable long-lived T₁ excitons. Particularly, <i>t</i>-DABNA-pyr exhibits emissions with a narrow full width at half maximum (~33 nm) and a high PLQY (~100%) in both solution and rigid states. Theoretical studies further suggest that the low-energy T₁ state is localized at the PAH moiety.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135862963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Promoting effects of cannabidiol on neurite growth and neuronal development in neuron-astrocyte sandwich coculture","authors":"Jungnam Kim,&nbsp;Hyunwoo Choi,&nbsp;Seoin Yang,&nbsp;Insung S. Choi","doi":"10.1002/bkcs.12795","DOIUrl":"10.1002/bkcs.12795","url":null,"abstract":"<p>(–)-Cannabidiol (CBD), a nonpsychoactive compound isolated from the <i>Cannabis</i> genus, has recently emerged as a promising research subject in neuroscience due to its potential therapeutic benefits against neurological disorders. However, there has been limited fundamental understanding of how CBD affects neuronal development, such as neurite outgrowth and axonal branching, at the cell level. This work investigates the effects of CBD on the early development of primary hippocampal neurons in a noncontact neuron-astrocyte coculture system. The immunocytochemical and quantitative analyses indicate that CBD of 10 μM promotes neurite growth, including neurite elongation and arborization, and accelerates the process of axon specification. The CBD treatment to the coculture system leads to noticeable increases in the longest-neurite length, primary-neurite number, and branch-point number, as well as the population of axon-determined neurons. The results provide informative insights into the therapeutic potential of CBD in neurological disorders, such as Alzheimer's disease.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136069028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced early-stage adsorption of chemical warfare agent simulant by MIL-68-(X%OH)","authors":"Gihyun Lee,&nbsp;Sojin Oh,&nbsp;Moonhyun Oh","doi":"10.1002/bkcs.12794","DOIUrl":"10.1002/bkcs.12794","url":null,"abstract":"<p>The development of porous adsorbents for removing hazardous chemicals is of paramount significance in mitigating the risks posed by these substances. Among these hazardous chemicals, chemical warfare agents (CWAs) are of primary concern due to their significant threat. Here, we report the development of porous metal–organic framework-based adsorbents designed to efficiently adsorb CWA simulant, particularly during the early stages of exposure. We selected MIL-68, which has a rigid Kagomé structure, as a model system for investigating the adsorption of 2-chloroethyl ethyl sulfide (CEES). The introduction of a dangling hydroxyl (OH) group within the MIL-68 framework significantly enhances CEES adsorption during the early stages of exposure to CEES vapors. However, it is crucial to note that an excessive presence of dangling OH groups can negatively impact adsorption ability. Therefore, it is imperative to carefully control the amount of dangling OH groups introduced into the MIL-68 framework to optimize CEES adsorption performance.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136069777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimized stereoselective and scalable synthesis of five-membered cyclic trans-β-amino acid building blocks via reductive amination","authors":"Jungwoo Hong,&nbsp;Wonchul Lee,&nbsp;Hee-Seung Lee","doi":"10.1002/bkcs.12786","DOIUrl":"10.1002/bkcs.12786","url":null,"abstract":"<p>We present an optimized method for the stereoselective synthesis of five-membered alicyclic and heterocyclic <i>trans</i>-β-amino acid derivatives. The process involves a reductive amination of β-keto esters using chiral auxiliary amines, with formic acid acting as a facilitator for rapid, diastereoselective reductions under gentle conditions. Our approach notably enhances isolated yields and permits the scalable production of <i>trans</i>-2-aminocyclopentanecarboxylic acid (<i>trans</i>-ACPC), 4-aminopyrrolidine-3-carboxylic acid (<i>trans</i>-APC), 4-aminotetrahydrofuran-3-carboxylic acid (<i>trans</i>-ATFC), and 4-aminotetrahydrothiophene-3-carboxylic acid (<i>trans</i>-ATTC) building blocks.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136070355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of choosing coordinate systems on computationally predicting nonradiative transition rates of flexible thermally activated delayed fluorescence molecules","authors":"Byeong Ki Min,&nbsp;Donggeon Kim,&nbsp;Dongwook Kim,&nbsp;Young Min Rhee","doi":"10.1002/bkcs.12785","DOIUrl":"10.1002/bkcs.12785","url":null,"abstract":"<p>Understanding nonradiative transition mechanisms is important in various situations. However, compared with radiative processes where temporal profiles of photon emission can be monitored in a straightforward manner, experimentally accessing the rate information may not be an easy task with nonradiative transitions. Hence, applying theoretical tools toward predicting the rates can be a useful tactic. Such predictions become very useful in designing optoelectronic materials as in the molecules adopted for constructing organic light-emitting diodes (OLEDs). The correlation function formalism is a method that can fulfill the purpose of designing OLED materials. The formalism requires information regarding the vibrational normal modes of the two electronic states before and after the transition. Because the method is also based on harmonic oscillator approximation, it can actually fail to provide high reliability when there is a large geometric distortion between the initial and the final states. In fact, the harmonic normal mode picture is more prone to lose reliability in the Cartesian coordinates than in the internal ones even at a small distortion, and hence adopting internal coordinates may be more preferable for practical calculations. This is because normal mode mixing becomes less severe when molecular coordinates are described with internal degrees of freedom such as bond stretching, bending, and torsion. In this regard, how much more reliable the nonradiative rate predictions in OLED materials become with the use of internal coordinate system deserves a close inspection. In this account, we review on the derivation of the correlation function formalism and provide how it can be adapted toward the use of the internal coordinates. As a demonstration, we evaluate the intersystem crossing and the internal conversion rates of a series of thermally activated delayed fluorescence (TADF) molecules with both Cartesian and internal coordinate systems. Overall, handling transitions involving substantial structural changes is improved indeed with the internal coordinates. However, limitations are still apparent for the TADF systems with a flexible donor–acceptor type construct especially when the inevitable inter-domain twisting takes place with the electronic transition. Future prospect for handling the issue is commented as a concluding remark.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134908117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of oxygen evolution electrocatalytic activity of metal oxide nanosheet via surface modification","authors":"Haslinda Binti Mohd Sidek,&nbsp;Jihyeong Lee,&nbsp;Xiaoyan Jin,&nbsp;Seong-Ju Hwang","doi":"10.1002/bkcs.12790","DOIUrl":"10.1002/bkcs.12790","url":null,"abstract":"<p>A surface modification route to high-performance oxygen evolution electrocatalysts was developed by immobilization of highly-oxidized SeO₄²⁻ species on the surface of exfoliated MnO₂ nanosheets. The enhanced stability of tetragonally-distorted MnO₆ octahedron could be achieved by the weakening of axial Mn–O bond due to competition with highly covalent Se⁶⁺–O bonds. The selenate anchoring was found to be quite effective in improving the electrocatalyst functionality of MnO₂ nanosheets for oxygen evolution reaction, which could be ascribed to the improvement of charge transfer kinetics and the enhancement of Mn³⁺ stability. This study emphasized that the fine-control of bonding nature via surface modification with selenate anchoring can offer useful means to explore efficient electrocatalysts.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135273236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}