Fluorescence Spectra of Europium (III) Phthalate and Naphthalate and of Samarium (111), Europium (Ill), Terbium (III) and Dysprosium (III) Dipyridyl Complexes

Abstract

The line emission spectra were measured at 300 °K and 78 °K in solid samples of europium (III) phthalate and naphthalate and in the α,α'-dipyridyl complexes Sm dip2 Cl3, 2 H2O; Eu dip2 Cl3, 2 H2O; Tb dip2(NO3)3 and Dy dip2(NO3)3, H2O. The gadolinium (III) compound Gd dip2 Cl3, 2 H2O shows a typical VAN UITERT effect of energy transfer from the main constituent to Eu (III) and Tb(III) present in the concentration range 0.01-0.1 mole %. The methanolic solution of Gd(III) does not exhibit such energy transfer, whereas Eu dip2+3 and aqueous solutions, probably of Eu phthal2- and Eu naphthal2-. fluoresce strongly at room temperature. However, the latter solution tends slowly to deposit crystalline salts.