以壳聚糖和2-甲氧基-4-硝基苯异硫氰酸酯为原料,合成了一种氨基壳聚糖类硫脲衍生物阴离子探针L,通过傅里叶变换红外光谱仪、扫描电镜能谱一体机对其结构、形貌及元素分布进行了表征,采用紫外-可见分光光度法研究了探针对阴离子的识别性能。结果表明:在纯二甲基亚砜(DMSO)溶液中,探针L对AcO-、F-和SO2-4表现出高选择性识别性能,且具有较强的紫外-可见吸收光谱;在DMSO/H2O(两者体积比为9∶1)溶液中,探针L也可以对AcO-、F-和SO2-4进行选择性识别。探针L具有显著的颜色响应,可以通过肉眼测定来实现传感行为。探针对阴离子的识别机理主要为化合物和阴离子复合物通过氢键形成,导致壳聚糖衍生物光谱信号发生变化。
An amino chitosan-based thiourea derivative probe L was synthesized from chitosan and 2-methoxy-4-nitrophenyl isothiocyanate.Its structure,morphology and elemental distribution were characterized by Fourier transform infrared spectrometry (FT-IR) and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy(SEM-EDS).The recognition performance of the probe for the anions was investigated by UV-visible spectrophotometry.The results showed that in pure dimethyl sulfoxide (DMSO) solution,the probe L exhibited high selective recognition for AcO-,F- and SO2-4,and had a strong UV-Vis absorption spectrum.In DMSO/H2O (both 9∶1,v/v) solution,probe L also selectively recognized AcO-,F- and SO2-4.Probe L demonstrated a remarkable colour response,which could be measured by the naked eye to achieve sensing behavior.The mechanism of anion recognition by the probe was the formation of hydrogen bonds between the major compounds and the anionic complexes,leading to a change in the spectral signal of the chitosan derivative.
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基金资助
新疆维吾尔自治区基金项目(2021D01C039)
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