Materials Data on NpH3 by Materials Project
NpH3 crystallizes in the trigonal P-3c1 space group. The structure is three-dimensional. Np3+ is bonded in a 11-coordinate geometry to eleven H1- atoms. There are a spread of Np–H bond distances ranging from 2.14–2.43 Å. There are three inequivalent H1- sites. In the first H1- site, H1- is bonded in a trigonal non-coplanar geometry to three equivalent Np3+ atoms. In the second H1- site, H1- is bonded to four equivalent Np3+ atoms to form a mixture of distorted corner, edge, and face-sharing HNp4 tetrahedra. In the third H1- site, H1- is bonded in a trigonal planar geometry to three equivalent Np3+ atoms.
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