Two series of dinuclear complexes of phthalate and 2

2'-dipyridyl with different molar ratio of Eu

3+

to Tb

3+

and Eu

3+

to La

3+

have been synthesized

respectively

Their IR absorption spectra

fluorescence spectra and TG-DTA curves have been studied.The synthesis of the complexes(Eu

x

Tb1-x)

2

L

3

L'(L=phthalate group

L'=2

2-dipyridyl)was performed through the reaction of the two ligands L' and L with the mixture of EuCl

3

and TbCl

3

in solution

and by the reaction of both ligands with EuCl

3

and LaCl

3

the complex of (Eu

y

La1-y)2L

3

L' was prepared.The luminescence spectra were taken on a F-3010 fluorescence spectrophotometer at room tempreture.The IR spectra were recorded on a Mattson Alpha Centauri FT-IR spectrophotometer with KBr pellet.The thermal analysis data were recorded on a Shimadau DT-40 thermal analysis instrument.The IR absorption spectra for all the complexes are similar.The spectra are obviously different with those of phthalate(KHL) and 2

2-dipyridyl. When the complexes were formed

the absorption peaks of COOH(1677cm

-1

)and C-OH(1287cm

-1

)disappeared.The anti-symmetric stretching vibrations of carboxylate group(as) shifted to lower frequencies

whereas the symmetric stretching vibrations(s)shifted to higher frequencies.These facts showed that phthalate was coordinated to the rare-earth ions.By comparison

there are two strong absorption peaks(1452.3cm

-1

and 1578.0cm

-1

)in 2

2'-dipyridly

whereas they shifted to about 1523cm

-1

and 1 616cm

-1

in the complexes. It indicates that the chemical bonds have been formed between rare earth ions and nitrogen atoms of 2

2'-dipyridly.