UCoNiGe2 crystallizes in the tetragonal P4/nmm space group. U(1) is bonded in a distorted single-bond geometry to four equivalent Co(1), one Ni(1), and four equivalent Ge(2) atoms. Co(1) is bonded in a body-centered cubic geometry to four equivalent U(1) and four equivalent Ge(2) atoms. Ni(1) is bonded in a 5-coordinate geometry to one U(1) and four equivalent Ge(1) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent Ni(1) atoms to form a mixture of distorted corner and edge-sharing GeNi4 tetrahedra. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent Co(1) atoms.
UCoNiGe2 crystallizes in the tetragonal P4/nmm space group. U(1) is bonded in a distorted single-bond geometry to four equivalent Co(1), one Ni(1), and four equivalent Ge(2) atoms. All U(1)-Co(1) bond lengths are 2.81 Å. The U(1)-Ni(1) bond length is 2.30 Å. All U(1)-Ge(2) bond lengths are 3.01 Å. Co(1) is bonded in a body-centered cubic geometry to four equivalent U(1) and four equivalent Ge(2) atoms. All Co(1)-Ge(2) bond lengths are 2.53 Å. Ni(1) is bonded in a 5-coordinate geometry to one U(1) and four equivalent Ge(1) atoms. All Ni(1)-Ge(1) bond lengths are 2.36 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent Ni(1) atoms to form a mixture of distorted corner and edge-sharing GeNi4 tetrahedra. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to four equivalent U(1) and four equivalent Co(1) atoms.