U4Pt11Ga20 crystallizes in the monoclinic C2/m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 14-coordinate geometry to two equivalent Pt(4), two equivalent Pt(6), one Ga(1), one Ga(2), one Ga(5), two equivalent Ga(10), two equivalent Ga(9), and three equivalent Ga(6) atoms. In the second U site, U(2) is bonded in a 14-coordinate geometry to two equivalent Pt(3), two equivalent Pt(5), one Ga(10), one Ga(2), one Ga(8), two equivalent Ga(5), two equivalent Ga(7), and three equivalent Ga(4) atoms. There are six inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to two equivalent Ga(7), two equivalent Ga(9), and four equivalent Ga(3) atoms to form distorted edge-sharing PtGa8 cuboctahedra. In the second Pt site, Pt(2) is bonded in a 7-coordinate geometry to one Ga(2), two equivalent Ga(3), two equivalent Ga(7), and two equivalent Ga(9) atoms. In the third Pt site, Pt(3) is bonded in a 10-coordinate geometry to two equivalent U(2), one Ga(4), one Ga(5), two equivalent Ga(1), two equivalent Ga(10), and two equivalent Ga(8) atoms. In the fourth Pt site, Pt(4) is bonded in a 7-coordinate geometry to two equivalent U(1), one Ga(10), one Ga(3), two equivalent Ga(5), and three equivalent Ga(6) atoms. In the fifth Pt site, Pt(5) is bonded in a 9-coordinate geometry to two equivalent U(2), one Ga(7), one Ga(8), two equivalent Ga(2), and three equivalent Ga(4) atoms. In the sixth Pt site, Pt(6) is bonded in a 9-coordinate geometry to two equivalent U(1), one Ga(10), one Ga(8), one Ga(9), two equivalent Ga(1), and two equivalent Ga(2) atoms. There are ten inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 3-coordinate geometry to one U(1), two equivalent Pt(3), and two equivalent Pt(6) atoms. In the second Ga site, Ga(2) is bonded in a 5-coordinate geometry to one U(1), one U(2), one Pt(2), two equivalent Pt(5), and two equivalent Pt(6) atoms. In the third Ga site, Ga(3) is bonded in a 5-coordinate geometry to one Pt(4), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the fourth Ga site, Ga(4) is bonded in a 4-coordinate geometry to three equivalent U(2), one Pt(3), and three equivalent Pt(5) atoms. In the fifth Ga site, Ga(5) is bonded in a 10-coordinate geometry to one U(1), two equivalent U(2), one Pt(3), two equivalent Pt(4), one Ga(6), one Ga(7), and two equivalent Ga(10) atoms. In the sixth Ga site, Ga(6) is bonded in a 10-coordinate geometry to three equivalent U(1), three equivalent Pt(4), one Ga(5), one Ga(9), and two equivalent Ga(6) atoms. In the seventh Ga site, Ga(7) is bonded in a 6-coordinate geometry to two equivalent U(2), one Pt(1), one Pt(5), two equivalent Pt(2), and one Ga(5) atom. In the eighth Ga site, Ga(8) is bonded in a 4-coordinate geometry to one U(2), one Pt(5), one Pt(6), and two equivalent Pt(3) atoms. In the ninth Ga site, Ga(9) is bonded in a 6-coordinate geometry to two equivalent U(1), one Pt(1), one Pt(6), two equivalent Pt(2), and one Ga(6) atom. In the tenth Ga site, Ga(10) is bonded in a 4-coordinate geometry to one U(2), two equivalent U(1), one Pt(4), one Pt(6), two equivalent Pt(3), and two equivalent Ga(5) atoms.
U4Pt11Ga20 crystallizes in the monoclinic C2/m space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 14-coordinate geometry to two equivalent Pt(4), two equivalent Pt(6), one Ga(1), one Ga(2), one Ga(5), two equivalent Ga(10), two equivalent Ga(9), and three equivalent Ga(6) atoms. Both U(1)-Pt(4) bond lengths are 3.30 Å. Both U(1)-Pt(6) bond lengths are 3.10 Å. The U(1)-Ga(1) bond length is 3.37 Å. The U(1)-Ga(2) bond length is 3.30 Å. The U(1)-Ga(5) bond length is 3.31 Å. Both U(1)-Ga(10) bond lengths are 3.14 Å. Both U(1)-Ga(9) bond lengths are 2.98 Å. There are two shorter (3.05 Å) and one longer (3.23 Å) U(1)-Ga(6) bond length. In the second U site, U(2) is bonded in a 14-coordinate geometry to two equivalent Pt(3), two equivalent Pt(5), one Ga(10), one Ga(2), one Ga(8), two equivalent Ga(5), two equivalent Ga(7), and three equivalent Ga(4) atoms. Both U(2)-Pt(3) bond lengths are 3.26 Å. Both U(2)-Pt(5) bond lengths are 3.17 Å. The U(2)-Ga(10) bond length is 3.25 Å. The U(2)-Ga(2) bond length is 3.28 Å. The U(2)-Ga(8) bond length is 3.17 Å. Both U(2)-Ga(5) bond lengths are 3.00 Å. Both U(2)-Ga(7) bond lengths are 2.96 Å. There are two shorter (3.14 Å) and one longer (3.44 Å) U(2)-Ga(4) bond length. There are six inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to two equivalent Ga(7), two equivalent Ga(9), and four equivalent Ga(3) atoms to form distorted edge-sharing PtGa8 cuboctahedra. Both Pt(1)-Ga(7) bond lengths are 2.74 Å. Both Pt(1)-Ga(9) bond lengths are 2.73 Å. All Pt(1)-Ga(3) bond lengths are 2.81 Å. In the second Pt site, Pt(2) is bonded in a 7-coordinate geometry to one Ga(2), two equivalent Ga(3), two equivalent Ga(7), and two equivalent Ga(9) atoms. The Pt(2)-Ga(2) bond length is 2.48 Å. There is one shorter (2.63 Å) and one longer (2.64 Å) Pt(2)-Ga(3) bond length. Both Pt(2)-Ga(7) bond lengths are 2.58 Å. Both Pt(2)-Ga(9) bond lengths are 2.58 Å. In the third Pt site, Pt(3) is bonded in a 10-coordinate geometry to two equivalent U(2), one Ga(4), one Ga(5), two equivalent Ga(1), two equivalent Ga(10), and two equivalent Ga(8) atoms. The Pt(3)-Ga(4) bond length is 2.69 Å. The Pt(3)-Ga(5) bond length is 2.68 Å. There is one shorter (2.60 Å) and one longer (2.90 Å) Pt(3)-Ga(1) bond length. Both Pt(3)-Ga(10) bond lengths are 2.65 Å. Both Pt(3)-Ga(8) bond lengths are 2.58 Å. In the fourth Pt site, Pt(4) is bonded in a 7-coordinate geometry to two equivalent U(1), one Ga(10), one Ga(3), two equivalent Ga(5), and three equivalent Ga(6) atoms. The Pt(4)-Ga(10) bond length is 2.69 Å. The Pt(4)-Ga(3) bond length is 2.55 Å. Both Pt(4)-Ga(5) bond lengths are 2.59 Å. There are two shorter (2.61 Å) and one longer (2.73 Å) Pt(4)-Ga(6) bond length. In the fifth Pt site, Pt(5) is bonded in a 9-coordinate geometry to two equivalent U(2), one Ga(7), one Ga(8), two equivalent Ga(2), and three equivalent Ga(4) atoms. The Pt(5)-Ga(7) bond length is 2.76 Å. The Pt(5)-Ga(8) bond length is 2.60 Å. Both Pt(5)-Ga(2) bond lengths are 2.65 Å. There is one shorter (2.55 Å) and two longer (2.63 Å) Pt(5)-Ga(4) bond lengths. In the sixth Pt site, Pt(6) is bonded in a 9-coordinate geometry to two equivalent U(1), one Ga(10), one Ga(8), one Ga(9), two equivalent Ga(1), and two equivalent Ga(2) atoms. The Pt(6)-Ga(10) bond length is 2.60 Å. The Pt(6)-Ga(8) bond length is 2.56 Å. The Pt(6)-Ga(9) bond length is 2.75 Å. Both Pt(6)-Ga(1) bond lengths are 2.67 Å. Both Pt(6)-Ga(2) bond lengths are 2.68 Å. There are ten inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 3-coordinate geometry to one U(1), two equivalent Pt(3), and two equivalent Pt(6) atoms. In the second Ga site, Ga(2) is bonded in a 5-coordinate geometry to one U(1), one U(2), one Pt(2), two equivalent Pt(5), and two equivalent Pt(6) atoms. In the third Ga site, Ga(3) is bonded in a 5-coordinate geometry to one Pt(4), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the fourth Ga site, Ga(4) is bonded in a 4-coordinate geometry to three equivalent U(2), one Pt(3), and three equivalent Pt(5) atoms. In the fifth Ga site, Ga(5) is bonded in a 10-coordinate geometry to one U(1), two equivalent U(2), one Pt(3), two equivalent Pt(4), one Ga(6), one Ga(7), and two equivalent Ga(10) atoms. The Ga(5)-Ga(6) bond length is 3.00 Å. The Ga(5)-Ga(7) bond length is 2.78 Å. Both Ga(5)-Ga(10) bond lengths are 2.99 Å. In the sixth Ga site, Ga(6) is bonded in a 10-coordinate geometry to three equivalent U(1), three equivalent Pt(4), one Ga(5), one Ga(9), and two equivalent Ga(6) atoms. The Ga(6)-Ga(9) bond length is 2.74 Å. Both Ga(6)-Ga(6) bond lengths are 3.00 Å. In the seventh Ga site, Ga(7) is bonded in a 6-coordinate geometry to two equivalent U(2), one Pt(1), one Pt(5), two equivalent Pt(2), and one Ga(5) atom. In the eighth Ga site, Ga(8) is bonded in a 4-coordinate geometry to one U(2), one Pt(5), one Pt(6), and two equivalent Pt(3) atoms. In the ninth Ga site, Ga(9) is bonded in a 6-coordinate geometry to two equivalent U(1), one Pt(1), one Pt(6), two equivalent Pt(2), and one Ga(6) atom. In the tenth Ga site, Ga(10) is bonded in a 4-coordinate geometry to one U(2), two equivalent U(1), one Pt(4), one Pt(6), two equivalent Pt(3), and two equivalent Ga(5) atoms.