奎宁-[PtI_6]^(2-)缔合微粒体系的光谱特性及分析应用

Spectral Properties of the Association Particle System of Quinine-[PtI_6]^(2-) and Its Analytical Application

在 0 0 2mol·L-1HCl介质中 ,红色 [PtI6]2 -配合物离子与奎宁作用生成紫红色PtI6 奎宁缔合微粒 ,在 310 ,4 0 0 ,4 70 ,6 10nm处产生 4个瑞利散射峰 ;在 35 0～ 70 0nm波长范围的吸光度值均增大 ,4 5 0nm荧光峰猝灭。在选定条件下 ,奎宁浓度在 0～ 4 0× 10 -6mol·L-1范围内与A62 0nm成正比 ,摩尔吸光系数ε62 0nm为 1 31× 10 4L·mol-1·cm-1。实验结果表明 ,奎宁缔合微粒的形成是导致瑞利散射信号增强和荧光猝灭的根本原因 ,而缔合微粒的颜色是共振散射所致。

In 0.01 mol(.)L(-1) HCl medium, red color [PtI6](2-) and quinine combine to form association molecule. The molecules aggregate automatically owing to strong hydrophobic and molecular forces. And PtI6-quinine association particles with violet-red color formed. It exhibits three resonance scattering peaks at 310 rim, 400 nm and 610 nm, and a Rayleigh scattering peak at 470 nm. The absorption values all increase in the wavelength range of 350-740 nm, and the fluorescence peak at 450 nm was quenched. Under the conditions chosen, the quinine concentration in the range of 0-40 x 10(-6)mol(.)L(-1) is linear to the A(630 nm) value. The mole absorption coefficient epsilon(620 nm) is 1.31 x 10(4) L(.)mol(-1.)cm(-1). The results show that the association particles produce the resonance scattering effect, fluorescence quenching and the violet-red color.