Np(FeGe)2 crystallizes in the tetragonal I4/mmm space group. Np(1) is bonded in a 16-coordinate geometry to eight equivalent Fe(1) and eight equivalent Ge(1) atoms. Fe(1) is bonded to four equivalent Np(1) and four equivalent Ge(1) atoms to form a mixture of distorted edge, face, and corner-sharing FeNp4Ge4 tetrahedra. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Np(1), four equivalent Fe(1), and one Ge(1) atom.
Np(FeGe)2 crystallizes in the tetragonal I4/mmm space group. Np(1) is bonded in a 16-coordinate geometry to eight equivalent Fe(1) and eight equivalent Ge(1) atoms. All Np(1)-Fe(1) bond lengths are 3.13 Å. All Np(1)-Ge(1) bond lengths are 3.09 Å. Fe(1) is bonded to four equivalent Np(1) and four equivalent Ge(1) atoms to form a mixture of distorted edge, face, and corner-sharing FeNp4Ge4 tetrahedra. All Fe(1)-Ge(1) bond lengths are 2.32 Å. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Np(1), four equivalent Fe(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.49 Å.