The rare earth complexes and the polymers can be made into composite nanofibers through electrospinning. The fluorescence intensity of these fiber composites is much higher than that of the rare earth complexes. By changing the mixed proportion of polymethyl methacrylate (PMMA) and complexes, nanofiber materials were prepared. Then, by measuring their fluorescence intensity, it is found that the carbonyl bond of PMMA may have coordinated with the rare earth ions and enhanced the luminescence intensity of them. Then, a series of experiments were designed to study their coordination and luminescence mechanism. The coordination mechanism of the polymers with carbonyl groups and the rare earth complexes was explained by Eu(TFT)3(TPPO), Eu(TFT)3(TPPO)2, Eu(PFP)3(TPPO), Eu(PFP)3(TPPO)2, and polyvinyl pyrrolidone (PVP) dissolved in chloroform solution, where TFT means 2-(2,2,2-trifluoroethyl)-1-tetralone, PFP means 2-(2,2,3,3,3-Pentafluoropro-panoyl)-3,4-dihydronaphthalen-1(2H)-one and TPPO means phosphine oxide. The coordination of PVP and the rare earth complexes in solution was studied, and it was found that the fluorine atoms of the ligand had a significant impact on the aggregation-induced effect of the composites. The electron transitioned in the polymers and the complexes were enhanced greatly by the coordination. The colors of emission light could be adjusted by the coordination of the polymers and the rare earth complexes.

CCDC no.: 886433The crystal structure is shown in the figure. Tables 1 and 2 contain details on crystal structure and measurement conditions and a list of the atoms including atomic coordinates and displacement parameters. Source of materialThe title compound is easily synthesized by means of reported procedures [3]. To a methanol solution of 1,3-bis(4,4,4-trifluoro-1,3-dioxobutyl)phenyl (1 g, 2.8 mmol), NaOH (0.2 g, 5.6 mmol) was added, and the mixture was allowed to stir for 5 min. To this methanol solution, LuCl 3 ·6H 2 O (1.86 mmol)

Various adverse health effects of endocrine disrupting compounds (EDCs) had been reported in recent years. Endocrine disrupting compounds also called environmental hormones, were exogenous endocrine disrupting compounds discharged into the environment by industrial production processes and could interfere with the endocrine systems of humans or animals abnormal and generate carcinogenic, teratogenic and mutagenic substances. They were widely distributed in the biosphere, by precipitation, surface runoff, the use of pesticide and water pollution, through the enrichment of drinking water and food chain leading serious harm to humans and organisms. Such compounds indirectly cause humans toxic and abnormal, but induce the estrogen-like effects on the organism directly. Even if the content is very low, endocrine disrupting compounds could threaten serious harm to human health and survival. In recent years, various kinds of endocrine disrupting compounds were also detected in the rivers and lakes in China with the rapid development of economy. Human exposure to very low dose during critical periods, for example at the cellular differentiation period, could alter the development course of these tissues and this may result in permanent character changes in the mature living beings 1. Recent toxicity studies indicated that bisphenol A exposure in