Abstract
Isomer shifts measured from the /sup 237/Np Moessbauer spectra of NpCp/sub 3/OR (R = alkyl), NpCp/sub 3/R, and NpCpAr (Ar = aryl) are used as a measure of the covalency in Np(IV) ligand bonding. The isomer shifts in NpCp/sub 3/-n-Bu and NpCp/sub 3/C/sub 6/H/sub 4/C/sub 2/H/sub 5/ show a strong sigma character for the Np-n-Bu and Np-C/sub 6/H/sub 4/C/sub 2/H/sub 5/ bonds. The sigma character of Np-OR bonding is definite but less pronounced. The comparatively low covalency in the bonding of NpCp/sub 4/ is ascribed to longer Np-C bonds in NpCp/sub 4/ than in NpCp/sub 3//sup +/ compounds. The /sup 237/Np isomer shift in Np(MeCp)Cl/sub 3/ . 2THF indicates that the MeCp ligand is sigma-bonded in this compound.
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