Abstract
The crystal structure of new complexes of Np(V) and Pu(V) propionates with 2,2’-bipyridine (Bipy) was studied. The compounds are isostructural. Their crystals are built of electrically neutral complexes [AnO2 (C10H8N2)(OOCC2H5)(H2O)] (An = Np, Pu). The equatorial surrounding of the actinyl(V) group consists of two nitrogen atoms of Bipy, two oxygen atoms of the propionateion, and oxygen atom of the water molecule. The coordination surrounding of the An(V) atom is a pentagonal bipyramid. In going from Np(V) to Pu(V), the actinide contraction is manifested in a regular decrease in the bond lengths in the pentagonal bipyramids. The water molecule in the An(V) coordination sphere forms strong hydrogen bonds with “yl” oxygen atoms of the adjacent complexes [AnO2(Bipy)(OOCC2H5)(H2O)]. As a result, the complexes in the crystal are bound in infinite chains oriented along the [100] direction.
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