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NpSb is Tetraauricupride structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Np3+ is bonded in a body-centered cubic geometry to eight equivalent Sb3- atoms. All Np–Sb bond lengths are 3.24 Å. Sb3- is bonded in a distorted body-centered cubic geometry to eight equivalent Np3+ atoms.
NpSb is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Np3+ is bonded to six equivalent Sb3- atoms to form a mixture of edge and corner-sharing NpSb6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Np–Sb bond lengths are 3.12 Å. Sb3- is bonded to six equivalent Np3+ atoms to form a mixture of edge and corner-sharing SbNp6 octahedra. The corner-sharing octahedral tilt angles are 0°.
NpSb3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Np3+ is bonded to twelve equivalent Sb1- atoms to form a mixture of face and corner-sharing NpSb12 cuboctahedra. There are six shorter (3.23 Å) and six longer (3.43 Å) Np–Sb bond lengths. Sb1- is bonded in a 4-coordinate geometry to four equivalent Np3+ atoms.
NpSb3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Np3+ is bonded to twelve Sb1- atoms to form NpSb12 cuboctahedra that share corners with four equivalent NpSb12 cuboctahedra, corners with sixteen equivalent SbNp4Sb4 cuboctahedra, edges with eight equivalent NpSb12 cuboctahedra, edges with eight equivalent SbNp4Sb4 cuboctahedra, and faces with four equivalent NpSb12 cuboctahedra. There are four shorter (3.15 Å) and eight longer (3.44 Å) Np–Sb bond lengths. There are two inequivalent Sb1- sites. In the first Sb1- site, Sb1- is bonded to four equivalent Np3+ and four equivalent Sb1- atoms to form distorted SbNp4Sb4 cuboctahedra that share corners with eight equivalent NpSb12 cuboctahedra, corners with sixteen equivalent SbNp4Sb4 cuboctahedra, edges with four equivalent NpSb12 cuboctahedra, edges with six equivalent SbNp4Sb4 cuboctahedra, and faces with four equivalent SbNp4Sb4 cuboctahedra. All Sb–Sb bond lengths are 3.15 Å. In the second Sb1- site, Sb1- is bonded in a square co-planar geometry to four equivalent Np3+ atoms.
NpSb2 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. Np6+ is bonded in a 9-coordinate geometry to nine Sb3- atoms. There are a spread of Np–Sb bond distances ranging from 3.13–3.34 Å. There are two inequivalent Sb3- sites. In the first Sb3- site, Sb3- is bonded in a 6-coordinate geometry to five equivalent Np6+ and one Sb3- atom. The Sb–Sb bond length is 2.95 Å. In the second Sb3- site, Sb3- is bonded in a 8-coordinate geometry to four equivalent Np6+ and four equivalent Sb3- atoms. There are two shorter (3.07 Å) and two longer (3.09 Å) Sb–Sb bond lengths.