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{"title":"基于两亲配体掺杂液晶的聚酰亚胺表面烷基悬垂基团 Hg2+ 离子检测技术","authors":"Nasir Majeed, Humaira Masood Siddiqi, Iqra Urooj, Faroha Liaqat","doi":"10.1002/pi.6684","DOIUrl":null,"url":null,"abstract":"<p>In this study, amphiphilic thiosemicarbazone was used to align liquid crystal (4-cyano-4′-pentylbiphenyl) in a homeotropic way on polyimide containing alkyl pendent groups (AHDPI), which was coated on a glass slide. The amphiphilic ligands 2-(4-(dodecyloxy)benzylid-ene)hydrazine-1-carbothioamide (DT) and 2-(1-dodecyl-2-oxoindolin-3-ylidene)hydrazine-1-carbothioamide (IT) were doped with liquid crystal (LC) to develop LC-based sensors to detect Hg<sup>2+</sup> ions in water. The selective interaction of carbothioamide with Hg<sup>2+</sup> ions triggered the orientation transition of LC from homeotropic to parallel alignment and gave dark to bright optical signal at the LC/aqueous interphase. Self-immobilization of thiosemicarbazone-based ligands on AHDPI-coated glass slide can be used to detect Hg<sup>2+</sup> ions with high sensitivity. The limit of detection with DT and IT was found to be 0.5 and 0.25 μmol L<sup>−1</sup>, respectively. Density functional studies were carried out to study the interaction of the thiosemicarbazone ligands with mercuric ions, resulting in highly negative binding energies of −1.55 and −2.06 eV for DT and IT with Hg<sup>2+</sup> ions, respectively. The chemical and thermal stability (up to 268 °C) of the AHDPI coated on glass slide made it reusable at least twice for sensor fabrication. This provides a quicker and cheaper alternative to traditional methods of sensor fabrication. © 2024 Society of Chemical Industry.</p>","PeriodicalId":20404,"journal":{"name":"Polymer International","volume":null,"pages":null},"PeriodicalIF":2.9000,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Amphiphilic ligand-doped liquid crystal-based detection of Hg2+ ions on polyimide surface with alkyl pendent groups\",\"authors\":\"Nasir Majeed, Humaira Masood Siddiqi, Iqra Urooj, Faroha Liaqat\",\"doi\":\"10.1002/pi.6684\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>In this study, amphiphilic thiosemicarbazone was used to align liquid crystal (4-cyano-4′-pentylbiphenyl) in a homeotropic way on polyimide containing alkyl pendent groups (AHDPI), which was coated on a glass slide. The amphiphilic ligands 2-(4-(dodecyloxy)benzylid-ene)hydrazine-1-carbothioamide (DT) and 2-(1-dodecyl-2-oxoindolin-3-ylidene)hydrazine-1-carbothioamide (IT) were doped with liquid crystal (LC) to develop LC-based sensors to detect Hg<sup>2+</sup> ions in water. The selective interaction of carbothioamide with Hg<sup>2+</sup> ions triggered the orientation transition of LC from homeotropic to parallel alignment and gave dark to bright optical signal at the LC/aqueous interphase. Self-immobilization of thiosemicarbazone-based ligands on AHDPI-coated glass slide can be used to detect Hg<sup>2+</sup> ions with high sensitivity. The limit of detection with DT and IT was found to be 0.5 and 0.25 μmol L<sup>−1</sup>, respectively. Density functional studies were carried out to study the interaction of the thiosemicarbazone ligands with mercuric ions, resulting in highly negative binding energies of −1.55 and −2.06 eV for DT and IT with Hg<sup>2+</sup> ions, respectively. The chemical and thermal stability (up to 268 °C) of the AHDPI coated on glass slide made it reusable at least twice for sensor fabrication. This provides a quicker and cheaper alternative to traditional methods of sensor fabrication. © 2024 Society of Chemical Industry.</p>\",\"PeriodicalId\":20404,\"journal\":{\"name\":\"Polymer International\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.9000,\"publicationDate\":\"2024-07-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Polymer International\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/pi.6684\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"POLYMER SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer International","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/pi.6684","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
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