Wu Yancheng, Lian Manyu, Huang Guotao, Zhang Yangfan, Yi Ningbo, Tian Liyong, Gan Feng, Ma Chunping
School of Textile Materials and Engineering, Wuyi University, Jiangmen 529020, China.
Molecules. 2023 Dec 7;28(24):7987. doi: 10.3390/molecules28247987.
A -butyldiphenylsilyl-containing polyimide () has been established as a colorimetric and ratiometric chemosensor for rapid detecting fluoride ions (F). The UV-vis absorbance ratio value (A/A) of in a DMF solution displays a wide linear range change to F concentrations with a detection limit (DL) value of 2.13 μM. Additionally, adding incremental amounts of F to a DMF solution of shows an immediate color change to yellow and finally to green from colorless. More interestingly, the resulting plus F system (·F) could detect trace water in DMF. The A/A value of ·F almost linearly increases with low water content, which suggests convenient quantitative sensing of trace water content in DMF. The DL value of ·F for sensing water in DMF is determined to be 0.00149% (/). The solution color of ·F returns to colorless when the water content increases, indicating that ·F can conveniently estimate water content in DMF by naked-eye detection. The detection mechanisms confirmed by an H NMR study and a DFT calculation involve a F-induced desilylation reaction of to form phenolate anion followed by protonation with trace water. Finally, film was fabricated for the colorimetric detection of F and water in CHCN.
含叔丁基二苯基硅基的聚酰亚胺（）已被确立为一种用于快速检测氟离子（F⁻）的比色和比率化学传感器。在二甲基甲酰胺（DMF）溶液中的紫外可见吸光度比值（A₄40/A₃60）随F⁻浓度呈现宽线性范围变化，检测限（DL）值为2.13 μM。此外，向的DMF溶液中逐量添加F⁻会使其立即从无色变为黄色，最终变为绿色。更有趣的是，所得的加F⁻体系（·F⁻）能够检测DMF中的痕量水。·F⁻的A₄40/A₃60值在低含水量时几乎呈线性增加，这表明可方便地对DMF中的痕量水含量进行定量传感。·F⁻用于检测DMF中水分的DL值被确定为0.00149%（体积分数/体积分数）。当含水量增加时，·F⁻的溶液颜色恢复为无色，表明·F⁻可通过肉眼检测方便地估算DMF中的含水量。通过¹H NMR研究和DFT计算证实的检测机制涉及F⁻诱导的去硅烷化反应生成酚盐阴离子，随后与痕量水发生质子化反应。最后，制备了用于比色检测乙腈（CHCN）中F⁻和水的薄膜。
