Zur Elektronenstruktur metallorganischer Komplexe der f-Elemente IL. Erstmalige Aufklärung der Elektronenstruktur eines metallorganischen σ-Komplexes der f-Elemente: Tris(bis(trimethylsilyl)methyl)erbium(III)

The linear dichroism spectrum of an oriented single crystal of tris(bis(trimethylsilyl)methyl)erbium has been measured at room and low temperatures. From the spectra obtained, a truncated crystal field splitting pattern is derived, and simulated by fitting the parameters of an empirical Hamiltonian. For 39 assignments, a reduced r.m.s. deviation of 20.4 cm−1 is achieved. The parameters derived allow the estimation of the crystal field strength produced by the bis(trimethylsilyl)methyl) ligand, the insertion of this ligand into truncated empirical nephelauxetic and relativistic nephelauxetic series, and the construction of experimentally-based non-relativistic and relativistic molecular orbital schemes in the f range.