Chemistry Department, Faculty of Sciences, Arak University, Dr. Beheshti Ave., Arak 38156-88349, Iran.
Chemistry Department, Faculty of Sciences, Arak University, Dr. Beheshti Ave., Arak 38156-88349, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Jul 5;255:119714. doi: 10.1016/j.saa.2021.119714. Epub 2021 Mar 19.
Herein, a chitosan Schiff base sample (CSAN) was strategically designed and prepared via a two-step process. In the first step, an azo derivative of 1- naphthylamine namely, [2-hydroxy-5-(naphthalene-1-yldiazenyl) benzaldehyde] (HNDB) was synthesized as an aldehyde moiety. Then the condensation reaction of HNDB with chitosan afforded CSAN as the target product. Structural analyses of synthesized material were accomplished through FT-IR, H NMR, UV-Vis, XRD, TGA, and SEM spectral methods. Meanwhile, the heterogeneous CSAN was able to detect the presence of hydrogen carbonate (HCO), acetate (AcO), and cyanide (CN) anions in semi-aqueous media (HO/DMSO; 10:90%, v/v). Moreover, the selectivity of CSAN towards CN anion was increased through variation in solvent mixture ratios. Thereupon, CSAN was explored as a promising sensor towards CN anion in an aqueous media through considerable color variation from colorless to pale yellow as well as quantitative chemical analysis. Overall, reliable CSAN chemosensor with high sensitivity for mentioned anions has a pivotal role in practical applications owing to it's reversibility ability.
本文通过两步法策略设计并制备了壳聚糖席夫碱样品（CSAN）。在第一步中，合成了 1-萘胺的偶氮衍生物，即[2-羟基-5-（萘-1-基偶氮基）苯甲醛]（HNDB），作为醛基部分。然后，HNDB 与壳聚糖的缩合反应得到了目标产物 CSAN。通过傅里叶变换红外光谱（FT-IR）、核磁共振氢谱（H NMR）、紫外可见光谱（UV-Vis）、X 射线衍射（XRD）、热重分析（TGA）和扫描电子显微镜（SEM）等光谱方法对合成材料进行了结构分析。同时，在半水介质（HO/DMSO；10:90%，v/v）中，CSAN 能够检测到碳酸氢根（HCO）、乙酸根（AcO）和氰根（CN）阴离子的存在。此外，通过改变溶剂混合物的比例，可以增加 CSAN 对 CN 阴离子的选择性。因此，通过可观的颜色变化（从无色变为浅黄色）以及定量化学分析，CSAN 在水溶液中作为 CN 阴离子的有前途的传感器得到了探索。总体而言，由于具有可逆能力，这种对上述阴离子具有高灵敏度的可靠 CSAN 化学传感器在实际应用中具有重要作用。
