The absorption spectrum of tris[hydrotris(1-pyrazolyl)borato]uranium(III) (UTp 3 ) was run at room and low temperatures. From the spectra obtained, a truncated crystal field (CF) splitting pattern could be derived, and simulated by fitting the free parameters of a phenomenological Hamiltonian achieving an r.m.s. deviation of 37.7 cm -1 for 29 assignments. The parameters used allow the insertion of the Tp ligand into empirical spectrochemical, nephelauxetic and
EinleitungWährend der letzten Jahrzehnte wurden die Kristallfeld(KF)-Aufspaltungsmuster hunderter Festkörper und Salze [2-7] sowie dutzender Molekülverbindungen der trivalenten Lanthaniden (Ln) mit Liganden der Stöchiometrien [η 1 -CH(SiMe 3 ) 2
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