[Fluorescence properties of C60-glucocorticoids].
C60 and its derivatives have become a research hotspot because of their unique structures, physical and chemical properties. The fluorescence properties of C60 and its derivatives are an important research embranchment of the fullerene science field. In the present paper the fluorescence properties of C60-glucocorticoids were firstly investigated. When excited with the wavelength of 350 nm at room temperature, C60-glucocorticoids displayed the fluorescence emission in chloroform at 447 nm. The sixty carbon atoms of C60 molecule are equivalent, belonging to the Ih group, and presenting high symmetry. It is difficult to observe the fluorescence of C60 under the same condition because of the high symmetry of C60 molecule. The fluorescence emission of C60-glucocorticoids is probably due to the decrease in the high symmetry of C60 molecule. Moreover, the fluorescence emission at 447 nm of a series of concentrations (10-13 micromol x L(-1)) of C60-glucocorticoids chloroform solutions excited at 350 nm was determined, and the result indicated that the C60-glucocorticoids in chloroform could quench itself's fluorescence intensity. Within the concentration range of 10-64 micromol x L(-1), the fluorescence intensity increased along with the accretion of the concentration. When the concentration of C60-glucocorticoids was greater than 64 micromol x L(-1) the fluorescence intensity decreased gradually.
Liu
Rui-Li
RL
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China. liuruili@sinap.ac.cn
Yin
Juan-Juan
JJ
Ma
Ji-Fei
JF
Li
Qing-Nuan
QN
Li
Wen-Xin
WX