萘酰亚胺衍生物的合成及对苦味酸的检测

设计并合成了萘酰亚胺衍生物N-正己基-4-2-(3-苯基硫脲)-乙氨基]-1,8-萘酰亚胺(HTN),通过NMR和MS表征了其结构。利用荧光光谱法研究了HTN对苦味酸(PA)的识别作用。研究发现,在C₂H₅OH/H₂O (2:1)体系中,HTN荧光强度随PA浓度的增加而大幅度下降。PA浓度在1×10^-6~5×10^-4 mol·L^-1范围内时,猝灭率(I₀-I)/I₀与PA]^0.5呈线性关系,R²=0.995 5。常见苯系物,如苯胺、苯甲醛、三硝基甲苯、苯酚、苯乙烯、吡啶、对甲苯磺酸、甲苯、硝基苯及氯苯等均不干扰HTN对PA的识别。结果表明,HTN对PA具有较好的选择性和灵敏度。

Synthesis of Naphthalimide Derivatives and Its Recognition for Picric Acid

N-hexyl-4-2-(3-phenyl-thiourea)-ethylamino]-naphthalimide (HTN), a naphthalimide derivative, was synthesized and its structure was determined by NMR and MS. The recognition of HTN for picric acid (PA) was investigated by fluorescence spectrum. The results show that the fluorescence intensity of HTN significantly reduces with the increasing of PA concentration in C2H5OH/H2O (2:1). For PA concentration from 1×10-6 mol·L-1 to 5×10-4 mol·L-1, the quenching rate, (I0-I)/I0, correlates linearly with PA]0.5, and R2=0.995 5. Meanwhile, no obvious interference is observed in the presence of the benzene series such as aniline, benzaldehyd, trinitrotoluene, phenol, styrene, pyridine, p-toluenesulfonic acid, toluene, nitrobenzene and chlorobenzene, indicating HTN''s excellent selectivity and high sensitivity for the detection of PA.