有机溶剂对α-萘乙酸无保护性流体室温磷光性质的影响

在无保护性介质存在下,仅以Na_2SO_3作化学除氧剂,用KI或TlNO_3作重原子微扰剂,就能直接诱导α-萘乙酸(α-NAA)水溶液强而稳定的流体室温磷光(RTP)发射。磷光峰位波长λ_(ex)/λ_(em)分别为281/495,522nm和289/492,521nm。当体系中引入少量有机溶剂时,体系RTP强度,达到稳定所需的光诱导时间及重原子微扰剂的选择都受到较大影响。在维持乙醇或乙腈含量<1％条件下,用KI作重原子时,α-NAA的分析曲线线性范围为6.0×10~(-7)～1.6×10~(-5)mol/L和1.6×10~(-5)～8.0×10~(-5)mol/L,相关系数分别为0.999和0.997,检出限为3.6×10~(-8)mol/L。用TlNO_3作重原子时,分析曲线线性范围为6.0×10~(-7)～4.0×10~(-5)mol/L,相关系数为0.997,检出限为4.3×10~(-8)mol/L。

Effects of Organic Solvent on Non-Protected Room Temperature Phosphorescence of a-Naphthaleneacetic acid

A strong and stable room temperature phosphorescence (RTF) signal of a-Naphthaleneacetic acid (α-NAA) aqueous solution can be induced only by using Na2SO3 as deoxidization and KI (or T1NO3) as heavy atom perturber. The maximum phosphorescence intensity wavelength are λex/λem = 281/495, 522nm (or λex/λem = 289/492, 521nm). When KI as heavy atom perturber, the RTP intensity is linear to α-NAA concentration in the range of 6. O×10~7~1. 6×10~5mol/L and 1. 6×10-5~8. 0× 10-5mol/L, the detection limit is 3. 6×10-8mol/L; When T1NO3 as heavy atom perturber, the RTP intensity is linear to α-NAA concentration in the range of 6. 0×10~7~4. 0×10-6mol/L, the detection limit is 4. 3× 10-8mol/L. The organic solvents added to the system have an strong effect on the RTP intensity, irradiation time required to acquire stable RTP signal and choice of heavy atom perturber.