APPLICATIONS OF DSCPCF MODEL IN RARE EARTH COMPLEXES (Ⅳ)——ANALYSIS OF ABSORPTION SPECTRA FOR Pr~(3+)- AND Tm~(3+)-2-THENOYLTRIFLUOROACETONE-PIPERIDINE COMPLEXES

The new complexes, RE(TTA)_4·HP(RE are Pr~(3+) and Tm~(3+)), have been prepared, and their UV-VIS-NIR absorption spectra measured. All the matrix element formulas of f~2 and f~(12) configurations in D_4 symmetry field have been derived with the Double Sphere Coordination Point Charge Field Model, and the influence of the symmetry change of the complex unit, REO_3, on the forbital levels of Pr~(3+) is discussed. And based on the theoretical calculations, the transition peaks in the absorption bands are assigned.