[The luminescence characters of heterocyclic selenium compounds and metallic ion in ethanol solutions]

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 nSn(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.