The crystal field parameters of base-free (Me 3 SiC5 H4 )3 Pr, (C5 H 5 )3 Pr.ΝCCH 3 , (C5 H5 ) 3 La(ΝCCH3 ) 2 :Pr, [Ρr(C8 H8 )]+ and Νd[Ν(SiMe3 ) 2 ]3 as model compound for Νd[CH(SiMe 3 ) 2 ]3 were inserted into the corresponding energy matrices of a model spin-free f1 system. Diagonalizing these matrices the crystal field splitting patterns of the f orbitals were calculated. These experimentally based molecular orbital schemes are compared with the results of previous model calculations.
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