Sinchow Malee, Chaicharoen Rania, Chuasaard Thammanoon, Yotnoi Bunlawee, Saenjum Chalermpong, Ngamjarurojana Athipong, Rujiwatra Apinpus
Office of Research Administration, Chiang Mai University, Chiang Mai 50200, Thailand.
Department of Chemistry, Faculty of Science, Chiang Mai University, 239 Houy Kaew Road, Chiang Mai 50200, Thailand.
ACS Omega. 2024 Dec 2;9(50):49441-49451. doi: 10.1021/acsomega.4c06958. eCollection 2024 Dec 17.
To examine the water-induced photoluminescence turn-on and its potential application in trace water sensing, a new series of [Ln(dmba)(HO)]·2HO, where Ln = La (), Pr (), Nd (), Sm (), Eu (), Gd (), Tb (), Dy (), Ho (), and Er (), were synthesized using dimethoxybenzoic acid (Hdmba). Their single-crystal structures and thermal and chemical robustness were investigated, and the effects of lanthanide contraction and noncovalent interactions were discussed. The photoluminescence and colorimetric properties of - were investigated. Their dependence on dehydration and rehydration was disclosed, from which the significant role of noncovalent interactions was proposed. Based on the dehydration-rehydration-dependent responses in the forms of photoluminescence emission and color, the turn-off (dehydration) and turn-on (rehydration) of the red emission of Eu () were demonstrated. Using a mobile phone camera and freeware application, its use in the colorimetric sensing of trace water in polar organic solvents was successfully achieved. With respect to ethanol, acetonitrile, and acetone, linear correlations were established from 0 to 3-5% by volume of water with an of over 0.98. The detection and quantification limits were less than 0.5 and 1.5%, respectively. The percentage recoveries were 92 and 110%. The underlying mechanism was postulated.
为了研究水致光致发光开启及其在痕量水传感中的潜在应用，使用二甲氧基苯甲酸（Hdmba）合成了一系列新的[Ln(dmba)(HO)]·2HO，其中Ln = La（）、Pr（）、Nd（）、Sm（）、Eu（）、Gd（）、Tb（）、Dy（）、Ho（）和Er（）。研究了它们的单晶结构、热稳定性和化学稳定性，并讨论了镧系收缩和非共价相互作用的影响。研究了-的光致发光和比色性质。揭示了它们对脱水和再水合的依赖性，由此提出了非共价相互作用的重要作用。基于光致发光发射和颜色形式的脱水-再水合依赖性响应，证明了Eu（）红色发射的关闭（脱水）和开启（再水合）。使用手机摄像头和免费软件应用程序，成功实现了其在极性有机溶剂中痕量水比色传感中的应用。对于乙醇、乙腈和丙酮，在0至3 - 5%（体积）的水范围内建立了线性相关性，相关系数超过0.98。检测限和定量限分别小于0.5%和1.5%。回收率分别为92%和110%。推测了潜在的机制。
