Np3H crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a 10-coordinate geometry to three equivalent Np(1), three equivalent Np(2), and four equivalent H(1) atoms. In the second Np site, Np(2) is bonded in a trigonal planar geometry to six equivalent Np(1) and three equivalent H(1) atoms. H(1) is bonded in a distorted trigonal planar geometry to three equivalent Np(2) and eight equivalent Np(1) atoms.
Np3H crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Np sites. In the first Np site, Np(1) is bonded in a 10-coordinate geometry to three equivalent Np(1), three equivalent Np(2), and four equivalent H(1) atoms. All Np(1)-Np(1) bond lengths are 2.48 Å. All Np(1)-Np(2) bond lengths are 2.78 Å. There are three shorter (2.78 Å) and one longer (2.97 Å) Np(1)-H(1) bond length. In the second Np site, Np(2) is bonded in a trigonal planar geometry to six equivalent Np(1) and three equivalent H(1) atoms. All Np(2)-H(1) bond lengths are 2.16 Å. H(1) is bonded in a distorted trigonal planar geometry to three equivalent Np(2) and eight equivalent Np(1) atoms.