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	Study on spectroscopic properties of eu and tb mixed solid complexes with a diamide ligand
	Cui Hai-xia1,2; Chen Jian-min1; Zhou Hui-di1
刊名	Spectroscopy and spectral analysis
	2008-08-01
卷号	28期号:8页码:1856-1861
关键词	Eu and tb mixed complexes Coprecipitation Grind Fluorescent properties
ISSN号	1000-0593
通讯作者	Chen jian-min(chenjm@lzb.ac.cn)
英文摘要	In the present work, eu(no3)(3) and tb(no3)(3) complexes with a diarnide ligand 1,6-bis[(2'-benzylaminofon-nyl)phenoxyl]hexane (l) were prepared in the solution of chloroform and ethyl acetate. their mixed complexes with different molar ratio also synthesized by coprecipitation. eu and tb complexes were mixed with different molar ratio, mechanically ground, and a series of mixed solid complexes were obtained. these mixed complexes were characterized by elemental analysis, uv-vis, ir and xps spectra. the analytical data were obtained by a vario el chn and indicated that eu and tb complexes formed a 2 : 3 metal-to-ligand stoichiometries 2re(no3)(3) center dot 3l center dot 4h(2)o. their ir spectra were recorded on a bruke fts66v/s spectrophotometer. the results indicate that all complexes have similar ir spectra, of which the characteristic bands have similar shifts, suggesting that they have a similar coordination structure. uv-vis spectra were recorded on a hitachi u-3010 spectrophotometer and showed that under the influence of the mixed ions, the absorbance of the mixed complexes is not identical with that of the pure complexes. xps spectra were analyzed on a phi-5702 x-ray photoelectron spectroscope (xps) operating with monochromatic mg k-alpha irradiation at pass energy of 29.4 ev. the binding energies of o(1s), eu(3d) and tb(4d) in the two kinds of mixed complexes were changed compared with eu-l and tb-l complexes. this indicates that these two synthetic methods were not a simple physical mixing process, but there was some chemical effect between the mixed eu-l and tb-l complexes. the fluorescence spectra of the mixed complexes were obtained on a hitachi f-4500 spectrophotometer at room temperature. the excitation and emission slit widths was 1.0 nm. it was concluded from the excitation spectra that the best excitation wavelengths for eu and tb complexes are 396 and 320 nm respectively. for the convenience of comparing the fluorescence intensities with each other, the excitation wavelengths were set to 320 nm. for the mixed complexes prepared by coprecipitation, the peak positions of the d-5(4)-> f-7(6) and d-5(4)-> f-7(5) transitions were not changed. the peak at 590 nm was assigned to the d-5(0)-> f-7(1) and d-5(4)-> f-7(4) transitions. its position is dependent on the content of eu and tb complexes. when the content of eu complex is large, this peak is near to the position of the d-5(0)-> f-7(1) transition, but when the content of tb complex is large, it is near to the position of the d-5(4)-> f-7(4) transition. the peak at 620 nm is a combined peak of the d-5(0)-> f-7(2) and d-5(4)-> f-7(3) transitions. it has a similar change with the peak at 590 nm. the change of these peak positions could indicate that there was interaction between eu and tb complexes. the fluorescence intensities of the mixed solid complexes were changed obviously as compared with the pure eu and tb complexes. the fluorescence intensities of their d-5(4)-> f-7(6) and d-5(4)-> f-7(5) transitions were lower than those of the tb complex as well as the theoretical values calculated by te molar ratio of tb complex, and decreased with the increase in the content of eu complex, which shows that the fluorescence intensities of terbium ions were quenched by europium ions. the fluorescence intensities of the two combined peaks at 590 and 620 run are higher than that of eu complex but lower than that tb complex and they increased with the increase in the content of tb complex, which indicates that the fluorescence intensities of eu3+ were sensitized by tb3+. in the mixed complexes prepared by grinding, the fluorescence intensities of eu3+ were also sensitized by tb3+ and the fluorescence intensities of tb3+ are also quenched by eu3+. under the excitation of uv light, the mixed complexes resulted by coprecipitation exhibit different fluorescence color.
WOS关键词	RARE-EARTH COMPLEXES ; LANTHANIDE COMPLEXES ; STATE
WOS研究方向	Spectroscopy
WOS类目	Spectroscopy
语种	英语
出版者	BEIJING UNIV PRESS
WOS记录号	WOS:000258968500038
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2391381
专题	中国科学院大学
通讯作者	Chen Jian-min
作者单位	1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China
推荐引用方式 GB/T 7714	Cui Hai-xia,Chen Jian-min,Zhou Hui-di. Study on spectroscopic properties of eu and tb mixed solid complexes with a diamide ligand[J]. Spectroscopy and spectral analysis,2008,28(8):1856-1861.
APA	Cui Hai-xia,Chen Jian-min,&Zhou Hui-di.(2008).Study on spectroscopic properties of eu and tb mixed solid complexes with a diamide ligand.Spectroscopy and spectral analysis,28(8),1856-1861.
MLA	Cui Hai-xia,et al."Study on spectroscopic properties of eu and tb mixed solid complexes with a diamide ligand".Spectroscopy and spectral analysis 28.8(2008):1856-1861.

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