{"title":"Liquid-assisted grinding (LAG) approach, metal-free synthesis of 2,3-dihydro-1,5-benzothiazepines and their electrochemical properties","authors":"Manjit Singh, Kuldeep Kumar Maurya, Manisha Malviya","doi":"10.1071/ch24006","DOIUrl":"https://doi.org/10.1071/ch24006","url":null,"abstract":"In this work, we have disclosed a facile metal-free synthesis of pharmaceutically fascinating and biologically important benzothiazepines in the presence of a few drops of ethanol. The present methodology converts chalcones and ortho-amino thiophenol into 2,3-dihydro-1,5-benzothiazepines under ambient conditions using liquid-assisted grinding, resulting in rapid synthesis in a very short period. This process is eco-friendly, operationally simple and gives good to excellent yields of products with easy isolation. This approach offers a facile synthesis of 2,3-dihydro-1,5-benzothiazepines from three readily available starting materials. An electrochemical study of the benzothiazepine derivatives was undertaken using cyclic voltammetry and electrochemical impedance spectroscopy techniques.","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141348667","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}
Natalie Ferreira Araujo, Sabrina Baptista Ferreira
{"title":"N,N-Dimethylformamide dimethyl acetal (DMFDMA): from derivatisation to C1 synthon","authors":"Natalie Ferreira Araujo, Sabrina Baptista Ferreira","doi":"10.1071/ch24020","DOIUrl":"https://doi.org/10.1071/ch24020","url":null,"abstract":"N,N-Dimethylformamide dimethyl acetal (DMFDMA), also called 1,1-dimethoxy-N,N-dimethylmethanamine, is a colorless liquid with rancid odour. The chemical structure of DMFDMA presents two important sites, a partially positive carbon that acts as an electrophile in condensation reactions and a partially negative nitrogen that acts as a nucleophile. Because of its structure, DMFDMA reacts with many different organic groups and can be a versatile reagent used in gas chromatography, as a protecting group and as a C1 synthon, especially in the construction of heterocycles.","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141347996","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":"A novel Schiff base-containing phthalocyanine and its azo dye-substituted analogue: the effect of pH on colour","authors":"Günay Kaya Kantar","doi":"10.1071/ch24014","DOIUrl":"https://doi.org/10.1071/ch24014","url":null,"abstract":"There are many studies in the literature devoted to the synthesis of phthalocyanines substituted with Schiff bases and azo dyes and their particular properties. However, the comparison of spectral properties of these analogue compounds has not been investigated up to now. Therefore, a new eugenol group-bearing Schiff base-substituted zinc(II) phthalocyanine compound was synthesised and characterised and its UV/Vis spectral properties were compared with its azo dye analogue at different pH. It was determined that the azo dye analogue showed more pronounced spectral changes than the Schiff base-substituted phthalocyanine, depending on pH.","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141349324","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":"Coatings based on dopamine-modified hyaluronic acid and Pluronic F127 for tracheal intubation","authors":"Chenggang Wu, Xiyi Yang, Xiaofeng Tang, Shuping Zhang","doi":"10.1071/ch23218","DOIUrl":"https://doi.org/10.1071/ch23218","url":null,"abstract":"<p>Endotracheal intubation holds significant importance in trauma point care and emergency medicine. However, laryngeal injury and subsequent chronic complications can result from the friction between the mucosa and the tube during intubation. Here we present a lubricant coating based on hyaluronic acid. Inspired by mussels, hyaluronic acid was first conjugated with dopamine to obtain HD, and then a triblock copolymer Pluronic F127 (F127) was complexed with HD to form a micelle layer. Dopamine can assist coating deposition on the tube under weak alkaline conditions, while improving the coating stability. The micelle layer formed by F127 and HD provides excellent water retention and lubrication performance. The friction coefficient of the HD-F127 coating was 56% lower than that of the control, as determined by a friction performance test.</p>","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140801365","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":"Surface-enhanced Raman spectroscopy (SERS) substrate based on gold nanostars–silver nanostars for imidacloprid detection","authors":"Norhayati Abu Bakar, Joseph George Shapter","doi":"10.1071/ch23189","DOIUrl":"https://doi.org/10.1071/ch23189","url":null,"abstract":"<p>Surface-enhanced Raman spectroscopy (SERS) is a powerful molecular spectroscopy technique that combines Raman spectroscopy with nanostructured metallic surfaces to amplify the Raman signals of target molecules by more than 10<sup>3</sup>. The high sensitivity of SERS poses a significant opportunity for pesticide detection in complex matrices at ultralow concentrations. In this study, we improved the SERS sensitivity for imidacloprid (IMD) by employing silver nanostars (AgNs) coated with gold nanostars (AuNs) as the SERS-active substrate. The SERS response towards IMD detection increased based on the combination of AuNs and AgNs on the substrate surface. The intensity of the SERS signal of IMD using the AuNs/AgNs substrate increased compared to using individual metal nanoparticle substrates. The excellent reproducibility of SERS intensity using the AuNs/AgNs substrate was achieved with a low relative standard derivative (RSD) of 4.87% for 20 different spots on the same sample and 5.19% for 20 different samples. This detection system can be used for multiple tests, which is crucial for the advancement of handheld sensors designed for field use, where minimal or no high-level technical support is accessible.</p>","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140591736","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":"Research on the sustainable effect of ZnS and MoS 2 decorated biochar nanocomposites for removing quinolones from antibiotic-polluted aqueous solutions","authors":"Ying-Jie Gan, Yue-hui Wang, Ya-ru Dang, Wen-jie Hao, Zheng-rong Hu, Zhi-wei Zhang, Yu-min Luo, Yan-bo Wu, Ai-jun Song, Zhong-bao Zhao","doi":"10.1071/ch23170","DOIUrl":"https://doi.org/10.1071/ch23170","url":null,"abstract":"<p>Antibiotic concentrations in wastewater generated by industries such as sewage treatment plants, medical pharmaceuticals and aquaculture has exceeded acceptable levels. It is particularly urgent to seek a method that can efficiently remove antibiotics. The removal potential of three quinolone antibiotics, pefloxacin (PF), levofloxacin (LF) and norfloxacin (NF), in simulated contaminated water was studied using a biochar-based nanomaterial prepared by a hydrothermal method. The data were fitted with adsorption kinetics, isotherms and thermodynamics. The results showed that ZnS–MoS<sub>2</sub> activated biochar (ZMMBC) acheived maximum adsorption amounts of 199.42, 125.00 and 142.58 mg g<sup>–1</sup> for PF, LF and NF, suggesting that ZMMBC has excellent adsorption performance. The adsorption mechanisms of PF, LF and NF molecules on ZMMBC include complexation, pore filling, π–π interactions, electrostatic interactions and hydrogen bond interactions.</p>","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140591637","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}
Oliver E. Hutt, Jamie A. Freemont, Stella Kyi, Stuart W. Littler, Ross P. McGeary, Peter J. Duggan, John Tsanaktsidis, Helen F. Cole, Maurice G. Kerr, Elizabeth H. Krenske, John H. Ryan
{"title":"Revisiting Staudinger and Ruzicka’s altered pyrethrolone: the cyclopentadienone dimers derived from pyrethrin I, cinerin I and jasmolin I","authors":"Oliver E. Hutt, Jamie A. Freemont, Stella Kyi, Stuart W. Littler, Ross P. McGeary, Peter J. Duggan, John Tsanaktsidis, Helen F. Cole, Maurice G. Kerr, Elizabeth H. Krenske, John H. Ryan","doi":"10.1071/ch23197","DOIUrl":"https://doi.org/10.1071/ch23197","url":null,"abstract":"<p>The reactions of pyrethrin I, cinerin I and jasmolin I with sodium hydroxide in ethanol afforded an approximately 1:1 ratio of two respective cyclopentadienone dimers, isolated in good yield. A combination of one-dimensional and two-dimensional NMR spectroscopic studies allowed determination of the structure and stereochemistry of the dimers. The dimers are formed by cycloaddition reactions of the less substituted alkene of the cyclopentadienone, and by regioisomeric <i>endo</i> transition states. Density functional theory calculations were in accord with the experimental findings showing the products formed by ambimodal transition states. One such transition state led to two initial products with the less stable product undergoing facile conversion to the other more stable, experimentally observed product. These studies clarify the structures of the altered pyrethrolone reported by Staudinger and Ruzicka in 1924.</p>","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140107859","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}
Yiwen Wang, Aijun Gong, Lina Qiu, Yuzhen Bai, Yang Liu, Ge Gao, Weiyu Zhao
{"title":"Application of diglycolamide extractant in rare-earth extraction","authors":"Yiwen Wang, Aijun Gong, Lina Qiu, Yuzhen Bai, Yang Liu, Ge Gao, Weiyu Zhao","doi":"10.1071/ch23188","DOIUrl":"https://doi.org/10.1071/ch23188","url":null,"abstract":"<p>Diglycolamide (DGA) extractant is a kind of rare-earth extractant with promising applications that has the advantages of high extraction capacity, ease of synthesis, good thermal stability and good radiation stability. It is a green extractant that contains only four elements, C, H, O and N, and produces no residue after incineration. The properties of DGAs containing branched <i>N</i>,<i>N</i>′-alkyl substituents have been much studied in recent years, and it has been shown that branched side chains lead to better separation. The introduction of structurally rigid elements in DGA provides new possibilities for separation of rare earth elements (REEs). Owing to the tiny differences in the chemical properties of adjacent REES, the simple use of DGA extractant cannot meet all separation requirements, and a masking agent is added to the aqueous phase to improve the separation by coextraction to meet the requirements of different processes. This review presents the structural analysis of the complexes and crystals of diglycolamide extractants with rare-earth ions through different characterization means, and the effects of different structural extractants, solvents, nitric acid and phase modifiers on extraction behavior are reviewed. This review pays special attention to the effect of the side chain structure of diglycolamide on extraction behavior, which provides a theoretical basis and guiding direction for the field of separation of the REEs by diglycolamide extractants.</p>","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140037476","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":"Status of rare-earth perovskite catalysts in environmental applications","authors":"Pengyun Li, Aijun Gong, Jiandi Li, Lina Qiu, Xianghai Wang, Yue Chen, Jiayi Yin, Xinyu Huang, Yifan Chen","doi":"10.1071/ch23148","DOIUrl":"https://doi.org/10.1071/ch23148","url":null,"abstract":"<p>Rare-earth perovskite oxides have become a research hotspot in the fields of environment and energy owing to their structural tunability, excellent redox properties, high stability and high catalytic activity. Researchers have designed and developed different rare-earth perovskite catalysts for tackling environmental pollutants in recent years. This review summarizes recent research progress on rare-earth perovskite catalysts in the catalytic oxidation and photocatalytic degradation of pollutants, gas sensing of volatile organic compounds and photocatalytic water splitting for hydrogen production and carbon dioxide reduction and conversion, and summarizes the mechanism of these reactions. It also discusses in detail the relationship between structural modification, synthesis process and the physical–chemical properties of the catalysts. Finally, the challenges with rare-earth chalcocite catalysts in the field of environment and energy are discussed.</p>","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140037269","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":"Simultaneous diversity-oriented synthesis of benzothiazoles and related diverse analogues by iodine-catalyzed intramolecular cyclization from identical substrates","authors":"Meng Cui, Xue-Lin Wang, Mengzhou Wang, Jian-Wu Xie","doi":"10.1071/ch23144","DOIUrl":"https://doi.org/10.1071/ch23144","url":null,"abstract":"<p>A facile oxidative cyclization of <i>β</i>-ketothioamides for the simultaneous formation of a compound library similar to natural product benzothiazole derivatives has been developed. The oxidative cyclization of <i>β</i>-ketothioamides resulted in the simultaneous formation of four classes of previously unknown benzothiazole derivatives. This chemistry’s versatility adds a valuable component to the methodology for obtaining benzothiazole derivatives.</p>","PeriodicalId":8575,"journal":{"name":"Australian Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140037181","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}