铱发光探针检测硝基芳香化合物机理

Detection Mechanism Research of Nitroaromatics by Iridium Luminescent Probe

以铱(Ⅲ)配合物Ir(ppy)_(3)为发光探针,检测3种硝基芳香化合物,包括3‐硝基苯甲酸、3‐硝基苯甲醇、3‐硝基三氟甲苯,并通过密度泛函理论计算结合光谱分析研究发光检测机理。结果表明,3‐硝基苯甲酸、3‐硝基苯甲醇和3‐硝基三氟甲苯可淬灭Ir(ppy)_(3)在乙腈中的发光,检测效率K_(SV)分别为20.4、1.8 L/mmol和2.8 L/mmol,最低检测限分别达0.155×10^(-6)、1.760×10^(-6) mol/L和1.116×10^(-6) mol/L。Ir(ppy)_(3)对3‐硝基苯甲酸、3‐硝基苯甲醇和3‐硝基三氟甲苯的发光检测机理为电子转移机理。

Ir(Ⅲ)complex Ir(ppy)_(3) was used as luminescent probe of the detection of three nitroaromatics include 3‐nitrobenzoic acid,3‐nitrobenzyl alcohol,and 3‐nitrotrifluorotoluene.And the luminescent detection mechanism was studied by density functional theory calculation and spectral analysis.The results showed that 3‐nitrobenzoic acid,3‐nitrobenzyl alcohol and 3‐nitrotrifluorotoluene could quench the luminescence of Ir(ppy)_(3) in acetonitrile,with detection efficiencies K_(SV) of 20.4 L/mmol,1.8 L/mmol and 2.8 L/mmol,and the lowest detection limits are 0.155×10^(-6) mol/L,1.760×10^(-6) mol/L and 1.116×10^(-6) mol/L,respectively.The luminescent detection mechanism of 3‐nitrobenzoic acid,3‐nitrobenzyl alcohol,and 3‐nitrotrifluorotoluene of Ir(ppy)_(3) is electron transfer.