U6Ni3Cu3Sb8 crystallizes in the monoclinic C2 space group. There are four inequivalent U sites. In the first U site, U(1) is bonded in a 12-coordinate geometry to one Ni(2), one Cu(1), two equivalent Cu(2), two equivalent Sb(1), two equivalent Sb(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. In the second U site, U(2) is bonded in a 12-coordinate geometry to two equivalent Ni(1), two equivalent Cu(2), two equivalent Sb(1), two equivalent Sb(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. In the third U site, U(3) is bonded in a 12-coordinate geometry to two equivalent Ni(1), two equivalent Cu(2), two equivalent Sb(1), two equivalent Sb(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. In the fourth U site, U(4) is bonded in a 12-coordinate geometry to one Ni(2), two equivalent Ni(1), one Cu(1), two equivalent Sb(1), two equivalent Sb(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 8-coordinate geometry to one U(2), one U(3), two equivalent U(4), one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. In the second Ni site, Ni(2) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(4), two equivalent Sb(2), and two equivalent Sb(4) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(4), two equivalent Sb(1), and two equivalent Sb(3) atoms. In the second Cu site, Cu(2) is bonded in a 8-coordinate geometry to one U(2), one U(3), two equivalent U(1), one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 9-coordinate geometry to one U(2), one U(3), two equivalent U(1), two equivalent U(4), one Ni(1), one Cu(1), and one Cu(2) atom. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to one U(2), one U(3), two equivalent U(1), two equivalent U(4), one Ni(1), one Ni(2), and one Cu(2) atom. In the third Sb site, Sb(3) is bonded in a 9-coordinate geometry to one U(2), one U(3), two equivalent U(1), two equivalent U(4), one Ni(1), one Cu(1), and one Cu(2) atom. In the fourth Sb site, Sb(4) is bonded in a 9-coordinate geometry to one U(2), one U(3), two equivalent U(1), two equivalent U(4), one Ni(1), one Ni(2), and one Cu(2) atom.
U6Ni3Cu3Sb8 crystallizes in the monoclinic C2 space group. There are four inequivalent U sites. In the first U site, U(1) is bonded in a 12-coordinate geometry to one Ni(2), one Cu(1), two equivalent Cu(2), two equivalent Sb(1), two equivalent Sb(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. The U(1)-Ni(2) bond length is 2.85 Å. The U(1)-Cu(1) bond length is 2.98 Å. There is one shorter (2.91 Å) and one longer (2.95 Å) U(1)-Cu(2) bond length. There is one shorter (3.31 Å) and one longer (3.37 Å) U(1)-Sb(1) bond length. There is one shorter (3.26 Å) and one longer (3.40 Å) U(1)-Sb(2) bond length. Both U(1)-Sb(3) bond lengths are 3.36 Å. There is one shorter (3.22 Å) and one longer (3.30 Å) U(1)-Sb(4) bond length. In the second U site, U(2) is bonded in a 12-coordinate geometry to two equivalent Ni(1), two equivalent Cu(2), two equivalent Sb(1), two equivalent Sb(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. Both U(2)-Ni(1) bond lengths are 2.90 Å. Both U(2)-Cu(2) bond lengths are 2.96 Å. Both U(2)-Sb(1) bond lengths are 3.28 Å. Both U(2)-Sb(2) bond lengths are 3.26 Å. Both U(2)-Sb(3) bond lengths are 3.28 Å. Both U(2)-Sb(4) bond lengths are 3.40 Å. In the third U site, U(3) is bonded in a 12-coordinate geometry to two equivalent Ni(1), two equivalent Cu(2), two equivalent Sb(1), two equivalent Sb(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. Both U(3)-Ni(1) bond lengths are 2.90 Å. Both U(3)-Cu(2) bond lengths are 2.96 Å. Both U(3)-Sb(1) bond lengths are 3.27 Å. Both U(3)-Sb(2) bond lengths are 3.29 Å. Both U(3)-Sb(3) bond lengths are 3.41 Å. Both U(3)-Sb(4) bond lengths are 3.28 Å. In the fourth U site, U(4) is bonded in a 12-coordinate geometry to one Ni(2), two equivalent Ni(1), one Cu(1), two equivalent Sb(1), two equivalent Sb(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. The U(4)-Ni(2) bond length is 2.89 Å. There is one shorter (2.88 Å) and one longer (2.94 Å) U(4)-Ni(1) bond length. The U(4)-Cu(1) bond length is 3.01 Å. There is one shorter (3.33 Å) and one longer (3.42 Å) U(4)-Sb(1) bond length. There is one shorter (3.21 Å) and one longer (3.33 Å) U(4)-Sb(2) bond length. Both U(4)-Sb(3) bond lengths are 3.28 Å. There is one shorter (3.25 Å) and one longer (3.31 Å) U(4)-Sb(4) bond length. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 8-coordinate geometry to one U(2), one U(3), two equivalent U(4), one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. The Ni(1)-Sb(1) bond length is 2.64 Å. The Ni(1)-Sb(2) bond length is 2.65 Å. The Ni(1)-Sb(3) bond length is 2.65 Å. The Ni(1)-Sb(4) bond length is 2.65 Å. In the second Ni site, Ni(2) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(4), two equivalent Sb(2), and two equivalent Sb(4) atoms. Both Ni(2)-Sb(2) bond lengths are 2.66 Å. Both Ni(2)-Sb(4) bond lengths are 2.66 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 8-coordinate geometry to two equivalent U(1), two equivalent U(4), two equivalent Sb(1), and two equivalent Sb(3) atoms. Both Cu(1)-Sb(1) bond lengths are 2.65 Å. Both Cu(1)-Sb(3) bond lengths are 2.66 Å. In the second Cu site, Cu(2) is bonded in a 8-coordinate geometry to one U(2), one U(3), two equivalent U(1), one Sb(1), one Sb(2), one Sb(3), and one Sb(4) atom. The Cu(2)-Sb(1) bond length is 2.68 Å. The Cu(2)-Sb(2) bond length is 2.68 Å. The Cu(2)-Sb(3) bond length is 2.67 Å. The Cu(2)-Sb(4) bond length is 2.68 Å. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 9-coordinate geometry to one U(2), one U(3), two equivalent U(1), two equivalent U(4), one Ni(1), one Cu(1), and one Cu(2) atom. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to one U(2), one U(3), two equivalent U(1), two equivalent U(4), one Ni(1), one Ni(2), and one Cu(2) atom. In the third Sb site, Sb(3) is bonded in a 9-coordinate geometry to one U(2), one U(3), two equivalent U(1), two equivalent U(4), one Ni(1), one Cu(1), and one Cu(2) atom. In the fourth Sb site, Sb(4) is bonded in a 9-coordinate geometry to one U(2), one U(3), two equivalent U(1), two equivalent U(4), one Ni(1), one Ni(2), and one Cu(2) atom.