B. Yan et al., Spectroscopic study of the photophysical properties of rare earth ions encapsulated: Water soluble functional calixresorcin[4]arene, SPECT LETT, 33(5), 2000, pp. 705-715
A novel macrocyclic compound-water soluble functional calixresorcin[4]arene
s-tetra para sulfo-phenylmethyl-calixresorcin[4]are was synthesized for the
first time. The photophysical properties of terbium and europium ions enca
psulated in the macrocyclic ligand were studied in detail. The triplet stat
e energy of the calixresorcin[4]arene was determined to be 24400 cm(-1) by
the low temperature phosphorescence spectrum and it was found that it can s
ensitize both terbium ion and europium ion. The possible energy transfer pr
ocess between the functional calixresorcin[4]arene and the encapsulated Tb3
+ and Eu3+ was discussed. The luminescence quantum efficiency of Tb3+- cali
xresorcin[4]arene was calculated.