Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India.
Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2022 Nov 5;280:121521. doi: 10.1016/j.saa.2022.121521. Epub 2022 Jun 17.
Polarity is a complex parameter, with important effect in chemistry and biology. In recent years, polarity exploration attracted more and more attention hence, it's of great importance to exploit new methods for polarity determination. A novel class of long, coplanar, and amine incorporated electron-rich quinoxaline scaffold(L) furnished maximum solvatochromic effect and large Stokes shift and was chosen to determine water content in organic solvents e.g. acetonitrile, THF, DMF, and methanol through fluorescence spectroscopy. Moreover, the probe was found to perform as an effective fluorescent sensor for the quantitative detection of low-level moisture content in four commonly-used organic solvents with low detection limits (0.018%, 0.027%, 0.012%, and 0.43% respectively). This study also describes the morphological transformation of L form a fibrous network to spherical aggregates upon increasing water content in several organic solvents. Real-life implementation of the probe was successfully employed for the detection of moisture content in commercial food products and building materials such as cement, sand, limestone, salt, wheat, and detergent powder. Furthermore, probe L-immersed easy-to-prepare test strips provide a reliable approach for qualitative monitoring of water content in organic solvents by a simple color-changing method under UV irradiation via smartphone-assisted RGB analysis.
极性是一个复杂的参数，在化学和生物学中具有重要的影响。近年来，极性探索引起了越来越多的关注，因此，开发新的极性测定方法非常重要。一类新型的长、共面、含胺的富电子喹喔啉支架（L）具有最大的溶剂化显色效应和大的斯托克斯位移，被选择通过荧光光谱法来测定有机溶剂（如乙腈、THF、DMF 和甲醇）中的含水量。此外，该探针被发现是一种有效的荧光传感器，可用于定量检测四种常用有机溶剂中的低水平水分含量，检测限低（分别为 0.018%、0.027%、0.012% 和 0.43%）。本研究还描述了 L 形态从纤维网络到几种有机溶剂中含水量增加时的球形聚集体的形态转变。该探针在商业食品和建筑材料（如水泥、沙子、石灰岩、盐、小麦和洗衣粉）中的水分含量检测中的实际应用取得了成功。此外，L 探针浸渍的易于制备的测试条通过智能手机辅助的 RGB 分析，在 UV 照射下通过简单的变色方法，提供了一种可靠的有机溶剂含水量定性监测方法。
