Canadian Journal of Chemistry最新文献_第2页

A synthesis of L-(+)-quinic acid from D-(–)-quinic acid 从 D-(-)-奎宁酸合成 L-(+)-奎宁酸

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2023-11-17 DOI: 10.1139/cjc-2023-0139

Johnny Nguyen, Sandeep Bhosale, Andrew J. Bennet

引用次数: 0

Comparison of Seasonality of Urban Grime in Three Southern Ontario Cities 安大略省南部三个城市城市尘螨季节性比较

4区化学

Canadian Journal of Chemistry Pub Date : 2023-11-14 DOI: 10.1139/cjc-2023-0143

Yao Yan Huang, Emma M. McLay, James Donaldson

{"title":"Comparison of Seasonality of Urban Grime in Three Southern Ontario Cities","authors":"Yao Yan Huang, Emma M. McLay, James Donaldson","doi":"10.1139/cjc-2023-0143","DOIUrl":"https://doi.org/10.1139/cjc-2023-0143","url":null,"abstract":"Urban grime refers to films made of a complex chemical mixture of organics and inorganics deposited on outdoor surfaces. The specific chemical composition of such films can vary considerably due to geographic and seasonal influences. We compared the seasonal change of grime’s water-soluble inorganic ion content in a rural (Thamesford), suburban (Oshawa), and urban city (Toronto) in southern Ontario, Canada. Sodium, calcium, chloride, nitrate and sulphate amounts in grime was collected and quantified over four seasons in Oshawa, ON and Thamesford, ON and compared with results from a previous study in Toronto to elucidate differences. We found that all three regions displayed a clear seasonality in sodium and chloride consistent with winter road salt inputs and chloride loss in summer. Mole fractions of sulphate were consistently the lowest of the measured ions and NO3-/SO42- ratios showed a winter-spring minimum and summer-fall maximum. Urban – rural differences in the seasonal changes of ionic mole ratios suggests that additional chloride displacement by nitrate occurs within grime in Toronto that is not present in the two other rural/suburban cities in the same region.","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"30 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134957424","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}

引用次数: 0

Benzimidazolium Ionic Liquid Functionalized Star-polycaprolactone Stationary Phase for Capillary Gas Chromatography 苯并咪唑离子液体功能化星型聚己内酯毛细管气相色谱固定相

4区化学

Canadian Journal of Chemistry Pub Date : 2023-11-08 DOI: 10.1139/cjc-2023-0068

Ruonan Chen, Hongbing Yang, Qiuchen Huang, Mengyi Ba, Wen Li, Yanli Song, Zhiqiang Cai, Tao Sun, Qiaoqiao Feng, Shuai Li

{"title":"Benzimidazolium Ionic Liquid Functionalized Star-polycaprolactone Stationary Phase for Capillary Gas Chromatography","authors":"Ruonan Chen, Hongbing Yang, Qiuchen Huang, Mengyi Ba, Wen Li, Yanli Song, Zhiqiang Cai, Tao Sun, Qiaoqiao Feng, Shuai Li","doi":"10.1139/cjc-2023-0068","DOIUrl":"https://doi.org/10.1139/cjc-2023-0068","url":null,"abstract":"In this work, an innovative ionic liquid functionalized star-shape-polymer is synthesized by coupling star-polycaprolactone with benzimidazolium (star-PCL-Bim), and statically coated into a capillary column for gas chromatographic (GC) separations. The fabricated star-PCL-Bim capillary column with moderate-polar nature reveals a high column efficiency of 3598 plates/m for n-dodecane at 120°C, and advantageous distinguishing ability (R > 1.5) for 9 aromatic isomer mixtures and 12 cis-/trans-isomers. Its excellent resolving capacity can be credit to the architecture of star-PCL-Bim, the PCL arms and π-electron-rich benzimidazolium cations, and it results in a quite different retention behavior of star-PCL-Bim from that of star-PCL and commercial HP-35 columns, with “dual-nature” selectivity in separating a mixture including 29 compounds. These favorable chromatographic characteristics demonstrate the great application potential of this material in GC, and provide a prospective strategy to obtain high-performance stationary phases.","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"13 s4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135341162","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}

引用次数: 0

Multiple Verdazyl Radicals Appended to a Triarylamine Scaffold 附加在三芳胺支架上的多个硫酰基自由基

4区化学

Canadian Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.1139/cjc-2023-0148

Sydney Reiber, Bennett Templeman-Vivian, Michelle Mills, Chris Tremblay, David Leitch, Erin Chernick

引用次数: 0

High temperature Raman spectroscopic analysis of the crystal growth of Bi2ZnOB2O6 Bi2ZnOB2O6晶体生长的高温拉曼光谱分析

4区化学

Canadian Journal of Chemistry Pub Date : 2023-10-31 DOI: 10.1139/cjc-2023-0098

Ji Zhang, Daojun Liu

引用次数: 0

Copper crosslinked silicone elastomers in RGB colors: Degradable on Demand RGB颜色的铜交联有机硅弹性体:按需降解

4区化学

Canadian Journal of Chemistry Pub Date : 2023-10-16 DOI: 10.1139/cjc-2023-0118

Daniel Hrabowyj, Liam A. Wittenberg, Erin M. Donahue-Boyle, Yang Chen, Michael A. Brook

{"title":"Copper crosslinked silicone elastomers in RGB colors: Degradable on Demand","authors":"Daniel Hrabowyj, Liam A. Wittenberg, Erin M. Donahue-Boyle, Yang Chen, Michael A. Brook","doi":"10.1139/cjc-2023-0118","DOIUrl":"https://doi.org/10.1139/cjc-2023-0118","url":null,"abstract":"Increasing demand for fully recyclable polymers has prompted an interest in materials crosslinked via non-covalent interactions. Aggressive depolymerization can cleave backbone SiO bonds to generate linear oils or cyclic monomers from silicone rubbers, but one would rather recover the starting material oils simply by selectively breaking crosslinks. We demonstrate that ligand binding to metals can be used to reversibly crosslink silicone chains. Aminopropylsilicones were crosslinked via complexation with copper (II) acetate to form blue silicone oils. These oils slowly cured in air at room temperature to form soft, green elastomers over a month, or overnight at 50-55 °C in air to give robust, hard red elastomers. Potential explanations for the observed color changes are discussed. Elastomers prepared by either pathway underwent ready degradation by removal of the copper ions via competitive ligand binding using ethylenediamine, allowing for recovery of the unmodified silicone oil; the recovered amine could be reused with more copper to form a (softer) elastomer. This process provides a method for the synthesis of stable elastomeric silicones that are degradable on demand. ","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136078833","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}

引用次数: 1

Isolation of an antimicrobial racemic phenalenone derivative from a marine-derived Penicillium sp. fungus 从海洋来源的青霉属真菌中分离出一种抗菌外消旋苯烯酮衍生物

4区化学

Canadian Journal of Chemistry Pub Date : 2023-09-29 DOI: 10.1139/cjc-2023-0100

Nicholas Morehouse, Kelsie Graham, Samantha Cox, John Johnson, Christopher Gray

引用次数: 0

Synthesis of bisindolyl diphenylene from its ketone derivatives by infrared irradiation supported on a natural clay 天然粘土支撑下红外辐射合成双吲哚基二苯酮衍生物

4区化学

Canadian Journal of Chemistry Pub Date : 2023-09-20 DOI: 10.1139/cjc-2021-0288

Ricardo Alfredo Luna Mora, Francisco Barrera-Téllez, Karina Martínez-Mayorga, José Guadalupe Rosas-Jiménez, Alejandro Martínez-Zaldívar, Adrián Ricardo Hipólito-Nájera, Javier Pérez-Flores, Hulme Ríos-Guerra

{"title":"Synthesis of <i>bis</i>indolyl diphenylene from its ketone derivatives by infrared irradiation supported on a natural clay","authors":"Ricardo Alfredo Luna Mora, Francisco Barrera-Téllez, Karina Martínez-Mayorga, José Guadalupe Rosas-Jiménez, Alejandro Martínez-Zaldívar, Adrián Ricardo Hipólito-Nájera, Javier Pérez-Flores, Hulme Ríos-Guerra","doi":"10.1139/cjc-2021-0288","DOIUrl":"https://doi.org/10.1139/cjc-2021-0288","url":null,"abstract":"We examined the near-infrared (NIR) light-induced assembly efficiency to obtain light-sensitive 3,3′-(9H-fluorene-9,9-diyl) bis(1H-indole) derivatives using natural clay as metal-free Brønsted–Löwry catalyst (bentonitic Tonsil–Actisil FF (TAFF) clay) and an adduct of aluminum (III) chloride with 9-fluorenone. Their mixtures in solventless and aprotic solvent conditions were also explored. Among all the modified reactions tested, the combined effects of TAFF natural clay with NIR light, specifically in the λ 1.1 µm spectral region, result especially efficient to achieve the formation of C–Cπ bonds between π-excessive azaheteroaromatic reagents and functionalized polycyclic aromatic hydrocarbon to give the title compound in good yields within reasonable reaction times. The reaction coordinate was obtained using quantum chemical calculations. All the reactants, products, intermediates, and transition states were obtained for four systems. Natural orbital analysis allowed us to rationalize the transformations. Overall, this approach represents a greener and equally efficient alternative for conducting C–Cπ bond construction reactions in organic chemistry, and it is especially useful for protecting photosensitive compounds from abrupt decomposition.","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136309260","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}

引用次数: 0

Synthesis and Antimalarial Activity of Novel 3-Substituted Chloroquine Derivatives 新型3-取代氯喹衍生物的合成及抗疟活性研究

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2023-08-29 DOI: 10.1139/cjc-2023-0062

Benita Kapuku, Fadi Baakdah, E. Georges, D. Bohle

引用次数: 0

Photocatalytic splitting of water on g-C3N4-based single-atom Pt catalysts with stable “sandwich” structure: A combined first principles and semiempirical investigation 具有稳定“三明治”结构的g- c3n4基单原子Pt催化剂光催化分解水:结合第一性原理和半经验研究

IF 1.1 4区化学

Canadian Journal of Chemistry Pub Date : 2023-08-22 DOI: 10.1139/cjc-2023-0066

Cheng Yang, Jinren Yan, Jiang Wu, Rujie Li, Qingju Liu

{"title":"Photocatalytic splitting of water on g-C3N4-based single-atom Pt catalysts with stable “sandwich” structure: A combined first principles and semiempirical investigation","authors":"Cheng Yang, Jinren Yan, Jiang Wu, Rujie Li, Qingju Liu","doi":"10.1139/cjc-2023-0066","DOIUrl":"https://doi.org/10.1139/cjc-2023-0066","url":null,"abstract":"Solar-to-hydrogen energy conversion is a promising strategy to solve environmental pollution and energy crisis by utilizing photocatalytic water splitting. In this work, a “sandwich” structure of g-C3N4-based single-atom Pt catalyst for photocatalytic water splitting is proposed and investigated using a combined first principles and semiempirical study method. The calculation results indicate that, without any cocatalyst, the photogenerated holes in the valence band of BL-g-C3N4 cannot oxidize H2O to O2, and its OER performance is not better than that of the pristine monolayer g-C3N4. Significantly, the photogenerated holes in the valence band of the \"sandwich\" structured photocatalyst g-C3N4-Pt1-g-C3N4 can oxidize H2O to O2 without any cocatalyst. That is, the OER performance of g-C3N4-Pt1-g-C3N4 is better than that of the pristine g-C3N4 and the pristine BL-g-C3N4. However, it can be found that the introduction of single Pt atom confinement in the BL-g-C3N4 cannot effectively reduce HER energy barrier or improve the hydrogen evolution kinetics of BL-g-C3N4. In other words, the introduction of the confined single Pt atom in the BL-g-C3N4 not only fails to improve HER performance of BL-g-C3N4, but deteriorates HER catalytic performance of BL-g-C3N4. These findings provide some theoretical insights for engineers to prepare photocatalysts with higher activity and stability.","PeriodicalId":9420,"journal":{"name":"Canadian Journal of Chemistry","volume":"7 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84021803","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}

引用次数: 0