Abstract
Transition metal ions (Pb2+, Zn2+, Cd2+, Co2+, Mn2+,Cu2+, Ni2+, Hg2+, Ag+, Fe3+) in water are used to quench emission of 2-(6-oxido-6H-dibenz < c,e > < 1,2 > oxapho-sphorin-6-yl)-1,4-phenylene.bis(p-pentyloxylbenzoate)s (MD5) with aggregation-induced emission enhance-ment (AIEE) in water-acetonitrile (AN) mixture (80:20 by volume). Among all metal ions, Fe3+ exhibits the highest quenching efficiency on AIEE of MD5 even when the concentration of Fe3+ is lower than 1×10-6mol/L. The quenching efficiency of Hg2+ is lower than that of Fe3+ at the same concentration, though MD5 is used to detect Hg3+ efficiently, too. To other metal ions,low quenching efficiency has few relations with a wider concentration range. The UV absorbance spectra show only red shift of absorbance wavelength in the presence of Hg2+ and Fe3+, which indicates a salt-induced J-aggregation. SEM photos reveal larger aggregation and morphological change of nanoparticles of MD5 in water containing Hg2+ and Fe3+, which reduce the surface area of MD5 emission for further aggregation. The selective quenching effect of transition metal ions to emission of MD5 has a potential application in chemical sensors of some metal ions.
基金项目
国家自然科学基金(20634020)
Basic Research Foundation of Beijing Institute of Technology(BIT-UBF-200504B4213)
Basic Research Foundation of Beijing Institute of Technology(BIT-UBF-200504B4215)
NETL
NSTL
万方数据