Dash Pragyan P, Mishra S, Puri S, Bhaskaran Renjith, Sahoo Suban K, Jali Bigyan R
Department of Chemistry, Veer SurendraSai University of Technology, Burla, Sambalpur, Odisha, 768018, India.
Department of Chemistry, Madanapalle Institute of Technology & Science, Angallu, Kadiri Road, Madanapalle, Andhra Pradesh, 513725, India.
J Fluoresc. 2025 Jul 11. doi: 10.1007/s10895-025-04435-3.
Selective and sensitivity qualitative detection of tiny amounts of water in organic solvents remains a hot research area due to its tremendous application in pharmaceutical, medical, chemical laboratory, industrial etc. Hence, this work devoted, design a simple and cost-effective Schiff base namely, 4-((thiazol-2-ylimino)methyl)benzene-1,3-diol (L) by simple condensation of 1: 1 molar ration of 2-aminothizaole and 2,4-dihydroxy benzaldehyde. The probe (L) was employed for selective detection of trace water in methanol (CHOH) solvents. The dark yellowish color solution of L changed to light yellow in color upon addition of water, which is visible through naked eye. Upon addition of water to the methanolic solution of L, enhancement of fluorescence was observed with a detection limit (LOD) of 0.1634 wt %. The enhancement of fluorescence emission is due to the formation of aggregation induced emission fluorescence enhancement (AIEE). Further, formation of AIEE was established through dynamic light scattering (DLS), scanning electron microscope (SEM) and quantum mechanical (DFT and TDDFT) analysis. Finally, probe was used to detect qualitatively tiny amounts of moisture in various raw food adducts (wheat, sugar salt, honey) and various building materials (sand, cement, limestone, and fly ash).
由于在制药、医学、化学实验室、工业等领域有巨大应用，有机溶剂中微量水的选择性和灵敏度定性检测仍是一个热门研究领域。因此，本工作致力于通过2-氨基噻唑与2,4-二羟基苯甲醛按1:1摩尔比简单缩合，设计一种简单且经济高效的席夫碱，即4-((噻唑-2-基亚氨基)甲基)苯-1,3-二醇（L）。该探针（L）用于选择性检测甲醇（CH₃OH）溶剂中的痕量水。加入水后，L的深黄色溶液变为浅黄色，肉眼可见。向L的甲醇溶液中加入水后，观察到荧光增强，检测限（LOD）为0.1634 wt%。荧光发射增强是由于聚集诱导发光荧光增强（AIEE）的形成。此外，通过动态光散射（DLS）、扫描电子显微镜（SEM）和量子力学（DFT和TDDFT）分析确定了AIEE的形成。最后，该探针用于定性检测各种生食添加剂（小麦、糖、盐、蜂蜜）和各种建筑材料（沙子、水泥、石灰石和粉煤灰）中的微量水分。
