AuCl-4-I-纳米微粒体系的共振散射和荧光光谱

AuCl4^-与I^-可形成（AuI）n纳米微粒．当I^-浓度较低时，体系呈AuCl4^-浅黄色，在约320nm处有1个较强的共振散射峰，在470nm处有1个同步散射峰；在350，400，420和466nm处有4个荧光峰．当I^-浓度较高时，体系呈黄绿色，在360，420，520nm处有3个共振散射峰，在467nm有1个较强的同步散射峰；在466nm处有1个较强的荧光峰．当I^-浓度大于AuCl4^-浓度4倍，在270，315nm处有2个同步散射峰，在470nm处有1个共振散射峰．AuI纳米微粒的浓度对共振散射信号和荧光强度的影响一致．采用光谱法、极谱法和透射电镜研究了AuCl4^--I^-纳米反应机理．结果表明，反应过程中小仅生成了I2，而且有（Aul）n纳米微粒和IO3^-存在，Aul2^可作为共振散射光谱分析新试剂．

Resonance Scattering and Fluorescence Spectral Study of the Nanoparticle System of AuCl-4-I-

AuCl~-_(4)reacts with I~(-)to form(AuI)_n nanoparticles in size of 12 nm.When the concentration of I~(-)is lower,the system is in light yellow of AuCl~-_(4)molecules.It exhibits a strong and wide resonance scattering peak at about 320 nm,and a synchronous scattering peak at 470 nm,and four fluorescence peaks at 350,400,420 and 466 nm.When the concentration is higher,the nanoparticle system is in yellow-green.It exhibits three resonance scattering peaks at 360,420 and 520 nm,and a synchronous scattering peak at 470 nm,and a strong fluorescence peaks at 466nm.The influence of the concentration of AuI nanoparticles on the resonance scattering signal and fluorescence intensity is consistent.The nano reaction mechanism of AuI is investigated by spectroscopy,polarography and transmission electron microscopy.In addtion to I_(2),there are(AuI)_(n)nanoparticle and IO~-_(3)in the system.A new analytical reagent of AuI~-_(2)in resonance scattering spectral analysis has been prepared.