Seven solid p-tert-butylcalix [8] arene(LH

8

)-DMF coordination compounds of rare earth(Sm

3+

Eu

3+

Tb

3+

Dy

3+

)and Tb

3+

nitrates doped with Ln

3+

(La

3+

Gd

3+

Y

3+

)have been synthesized.Their elemental analysis

rare earth complexometric titration

molar conductive

IR spectra

UV spectra and TG-DTA have been studied.The results suggest that the composition of the complexes are [RE(LH

6

)(NO

3

)(DMF)

4

]-3DMF and [Ln

0.5

Tb

0.5

(LH

6

)(NO

3

)(DMF)

4

]3DMF

respectively.In these complexes

the rare earth ions coordinate to the oxygen atoms of p-tert-butylcalix[8]

arene(LH

8

)and DMF

NO

-

3

group coordinate to the rare earth ions as the bidentate form.The fluorescence spectra of the complexes are determined at room temperature.The results suggest that the fluorescence emission intensity data are very different for the complexes

the data of terbium complex is higher

but other complexes are weaker.The fluorescence intensity of terbium complex is determined by the optimum excitation wavelength 322 nm(the exbandpass and embandpass are all 3 nm).As seen from Fig.2

terbium complex and its doped with La

3+

Gd

3+

and Y

3+

complexes have characteristic luminescence and its fluorescence intensity is enhanced after doping with La

3+

Gd

3+

Y

3+

.These show that the lowest excitation state energy level of Tb

3+

ion with the triplet state energy level of the ligands match well each other.The absorbing energy of the ligands are effectively transferred to Tb

3+

ion.The energy transferred process may be(LH

6

)

2-

→[(LH

6

)

2-

]

*

Ln

3+

→[(LH

6

)

2-

]

*

Tb

3+

→

5

D

4

(Tb

3+

)(Ln=La

Gd

Y).The fluorescence intensity of terbium complex is enhanced after doping with La

3+

Gd

3+

and Y

3+

ions.The radius of Y

3+

is the smallest

Gd

3+

is middle

and La

3+

is the biggest

so their coordination compounds.The distance is the shortest of Y

3+

coordination compound with Tb

3+

coordination compound

Gd

3+

coordination compound is middle

and La

3+

coordination compound is the longest

for this reason

the sensitization actions from La

3+

Gd

3+

and Y

3+

to Tb

3+

ion are Y

3+

>

Gd

3+

>

La

3+

.