摘要
将苝酰亚胺衍生物作为荧光团,以苝四酸酐和香草醛为原料,设计并合成了一种高效、有特定反应性能的新型苝酰亚胺类Pb2+荧光探针N,N-双香草醛基-1,6,7,12-四氯-3,4:9,10-苝二酰亚胺(PDI-VBD).通过质谱、核磁等检测手段对探针分子PDI-VBD的结构进行表征,利用紫外-可见吸收光谱和荧光光谱法探究了探针PDI-VBD对Pb2+的荧光识别性能.光谱分析研究结果显示,在NMP/H2O溶液体系中,探针分子PDI-VBD对Pb2+显示出较强的选择性识别能力和较高的灵敏度,即苝酰亚胺衍生物PDI-VBD自身的荧光较弱,但与 Pb2+结合之后,生成了具有较强荧光的配位化合物.金属离子共存实验证明此荧光探针对 Pb2+选择性高,且不受其他金属离子干扰.结果表明,香草醛取代的苝酰亚胺衍生物PDI-VBD是一种新型Pb2+荧光探针,选择性好、灵敏度高,可用于实际水样、食品及环境中重金属Pb2+的检测.
Abstract
A novel perylenediimide Pb2+fluorescent probe N,N-diheraldehyde-1,6,7,12-tetrachloro-3,4:9,10-perylenediimide(PDI-VBD)was designed and synthesizedthrough using perylenediimides as fluorescent groups,using perylene tetracarboxylic anhydride and vanillin as raw materials.The structure of probe PDI-VBD was characterized by MS and NMR.The fluorescence recognition performance of probe PDI-VBD for Pb2+was investigated by UV absorption and fluorescence spectroscopy.The results of spectral analysis show that the probe PDI-VBD shows strong selective recognition ability and high sensitivity to Pb2+in NMP/H2O solution.The perylenediimide derivatives PDI-VBD has weak fluorescence,but after combining with Pb2+,it produces a coordination compound with strong fluorescence.Metal ion coexistence experiments show that the fluorescence probe has high selectivity for Pb2+and is not interfered by other metal ions.The results showed that the vanillin-substituted perylenediimide derivative PDI-VBD is a novel Pb2+fluorescent probe with good selectivity and high sensitivity,which can be used for the detection of heavy metal Pb2+in real water samples,food and environment.
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