Electronic structures of highly symmetrical compounds of f elements XLIII: Parametric analysis of the absorption spectrum of tris(bis(trimethylsilylamido))dysprosium(III) (Dy(btmsa)3)

The absorption spectra of Dy(btmsa)3 in KBr pellets have been recorded at room and low temperatures. From the spectra obtained, a truncated crystal field (CF) splitting pattern was derived, and simulated by fitting the free parameters of a phenomenological Hamiltonian. The CF strength of the title compound is close to that of Er(btmsa)3, and the free ion parameters show the expected strong nephelauxetic and relativistic nephelauxetic effects. The experimentally based non-relativistic molecular orbital scheme (in the f range) of Dy(btmsa)3 is set up.