硒杂环-金属离子在乙醇溶液中的发光

The Luminescence Characters of Heterocyclic Selenium Compounds and Metallic Ion in Ethanol Solutions

研究了不同分子结构的硒杂环化合物 金属离子在乙醇溶液中的发光 ,硒杂环均为苤硒脑类化合物(Piazselenoles,简称Pis) :Piazselenole(PS) ;4 ,5 benzopiazselenole(BP) ;5 methyl piazselenole(MP) ;4 ,4 ' dipi azselenole(DP)。结果表明 :Pis的Em随分子共轭体系增大或共轭效应增强而出现有规律地红移 ;Sn(Ⅳ )对Pis的发光有明显的增敏作用 :使DP的Em蓝移 ;对MP荧光减弱 ,对BP和DP均有明显的荧光增强作用 ,对常温下不发光的PS ,在Sn(Ⅳ ) PS乙醇溶液有较强的特征荧光 (Ex =35 5nm ,Em =4 2 6nm) ;此外 ,Cr(Ⅲ ) ,Cd(Ⅱ ) ,Cu(Ⅱ ) ,Sb(Ⅲ )和Sn(Ⅳ )均使BP荧光增强 ,Fe(Ⅲ )和Fe(Ⅱ )浓度较大时使BP荧光减弱 ,Zn(Ⅱ )

We investigated the luminescence characters of the ethanol solutions containing metallic ions and heterocyclic selenium compounds with different molecular structures in this paper. Heterocyclic selenium compounds included piazselenole(PS), 4,5- benzopiazselenole(BP), 5-methyl-piazselenole(MP), and 4,4'-dipiazselenole(DP). The results were as follows: (1) When the conjugative effect of piazselenoles increased, the emission spectrum shifted to lower frequencies; (2) Sn(Ⅳ) made the DP emission wavelength shorten. Sn(Ⅳ) reduced the fluorescence of MP, but caused fluorescence enhancement for BP and DP. The fluorescence of PS couldn't be detected at normal temperature, but strong fluorescence of PS was determined when the ratio of n Sn(Ⅳ)/n PS was 0.5; (3) Sn(Ⅳ), Cr(Ⅲ), Cd(Ⅱ), Cu(Ⅱ) and Sb(Ⅲ) caused fluorescence enhancement for BP. The fluorescence of BP was reduced when increasing the concentration of Fe(Ⅲ) and Fe(Ⅱ). Zn(Ⅱ)had little effect on the fluorescence of BP.