NpH3 crystallizes in the trigonal P-3c1 space group. Np(1) is bonded in a 11-coordinate geometry to one H(1), two equivalent H(2), and eight equivalent H(3) atoms. There are three inequivalent H sites. In the first H site, H(2) is bonded in a trigonal non-coplanar geometry to three equivalent Np(1) atoms. In the second H site, H(3) is bonded to four equivalent Np(1) atoms to form a mixture of distorted edge, face, and corner-sharing HNp4 tetrahedra. In the third H site, H(1) is bonded in a trigonal planar geometry to three equivalent Np(1) atoms.
NpH3 crystallizes in the trigonal P-3c1 space group. Np(1) is bonded in a 11-coordinate geometry to one H(1), two equivalent H(2), and eight equivalent H(3) atoms. The Np(1)-H(1) bond length is 2.14 Å. Both Np(1)-H(2) bond lengths are 2.18 Å. There are a spread of Np(1)-H(3) bond distances ranging from 2.28-2.43 Å. There are three inequivalent H sites. In the first H site, H(2) is bonded in a trigonal non-coplanar geometry to three equivalent Np(1) atoms. In the second H site, H(3) is bonded to four equivalent Np(1) atoms to form a mixture of distorted edge, face, and corner-sharing HNp4 tetrahedra. In the third H site, H(1) is bonded in a trigonal planar geometry to three equivalent Np(1) atoms.