U4Pd11Ga20 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 Pd(4), two equivalent Pd(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 9-coordinate geometry to two equivalent Pd(5), one Ga(8), two equivalent Ga(4), two equivalent Ga(5), and two equivalent Ga(7) atoms. There are six inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to four equivalent Pd(2), two equivalent Ga(7), two equivalent Ga(9), and four equivalent Ga(3) atoms to form distorted face-sharing PdGa8Pd4 cuboctahedra. In the second Pd site, Pd(2) is bonded in a 7-coordinate geometry to two equivalent Pd(1), one Ga(2), two equivalent Ga(3), two equivalent Ga(7), and two equivalent Ga(9) atoms. In the third Pd site, Pd(3) is bonded in a 8-coordinate geometry to one Ga(4), one Ga(5), two equivalent Ga(1), two equivalent Ga(10), and two equivalent Ga(8) atoms. In the fourth Pd site, Pd(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 Pd site, Pd(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 Pd site, Pd(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 4-coordinate geometry to one U(1), two equivalent Pd(3), and two equivalent Pd(6) atoms. In the second Ga site, Ga(2) is bonded in a 5-coordinate geometry to one U(1), one Pd(2), two equivalent Pd(5), and two equivalent Pd(6) atoms. In the third Ga site, Ga(3) is bonded in a 5-coordinate geometry to one Pd(4), two equivalent Pd(1), and two equivalent Pd(2) atoms. In the fourth Ga site, Ga(4) is bonded in a 6-coordinate geometry to two equivalent U(2), one Pd(3), and three equivalent Pd(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 Pd(3), two equivalent Pd(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 Pd(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 Pd(1), one Pd(5), two equivalent Pd(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 Pd(5), one Pd(6), and two equivalent Pd(3) atoms. In the ninth Ga site, Ga(9) is bonded in a 6-coordinate geometry to two equivalent U(1), one Pd(1), one Pd(6), two equivalent Pd(2), and one Ga(6) atom. In the tenth Ga site, Ga(10) is bonded in a 4-coordinate geometry to two equivalent U(1), one Pd(4), one Pd(6), two equivalent Pd(3), and two equivalent Ga(5) atoms.
U4Pd11Ga20 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 Pd(4), two equivalent Pd(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)-Pd(4) bond lengths are 3.34 Å. Both U(1)-Pd(6) bond lengths are 3.15 Å. The U(1)-Ga(1) bond length is 3.38 Å. The U(1)-Ga(2) bond length is 3.37 Å. The U(1)-Ga(5) bond length is 3.31 Å. Both U(1)-Ga(10) bond lengths are 3.13 Å. Both U(1)-Ga(9) bond lengths are 3.00 Å. There are two shorter (3.02 Å) and one longer (3.21 Å) U(1)-Ga(6) bond length. In the second U site, U(2) is bonded in a 9-coordinate geometry to two equivalent Pd(5), one Ga(8), two equivalent Ga(4), two equivalent Ga(5), and two equivalent Ga(7) atoms. Both U(2)-Pd(5) bond lengths are 3.15 Å. The U(2)-Ga(8) bond length is 3.07 Å. Both U(2)-Ga(4) bond lengths are 3.07 Å. Both U(2)-Ga(5) bond lengths are 3.00 Å. Both U(2)-Ga(7) bond lengths are 3.00 Å. There are six inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to four equivalent Pd(2), two equivalent Ga(7), two equivalent Ga(9), and four equivalent Ga(3) atoms to form distorted face-sharing PdGa8Pd4 cuboctahedra. All Pd(1)-Pd(2) bond lengths are 2.76 Å. Both Pd(1)-Ga(7) bond lengths are 2.67 Å. Both Pd(1)-Ga(9) bond lengths are 2.65 Å. All Pd(1)-Ga(3) bond lengths are 2.85 Å. In the second Pd site, Pd(2) is bonded in a 7-coordinate geometry to two equivalent Pd(1), one Ga(2), two equivalent Ga(3), two equivalent Ga(7), and two equivalent Ga(9) atoms. The Pd(2)-Ga(2) bond length is 2.48 Å. There is one shorter (2.61 Å) and one longer (2.64 Å) Pd(2)-Ga(3) bond length. Both Pd(2)-Ga(7) bond lengths are 2.59 Å. Both Pd(2)-Ga(9) bond lengths are 2.60 Å. In the third Pd site, Pd(3) is bonded in a 8-coordinate geometry to one Ga(4), one Ga(5), two equivalent Ga(1), two equivalent Ga(10), and two equivalent Ga(8) atoms. The Pd(3)-Ga(4) bond length is 2.74 Å. The Pd(3)-Ga(5) bond length is 2.63 Å. There is one shorter (2.59 Å) and one longer (2.80 Å) Pd(3)-Ga(1) bond length. Both Pd(3)-Ga(10) bond lengths are 2.61 Å. Both Pd(3)-Ga(8) bond lengths are 2.58 Å. In the fourth Pd site, Pd(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 Pd(4)-Ga(10) bond length is 2.68 Å. The Pd(4)-Ga(3) bond length is 2.54 Å. Both Pd(4)-Ga(5) bond lengths are 2.57 Å. There are two shorter (2.59 Å) and one longer (2.75 Å) Pd(4)-Ga(6) bond length. In the fifth Pd site, Pd(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 Pd(5)-Ga(7) bond length is 2.74 Å. The Pd(5)-Ga(8) bond length is 2.59 Å. Both Pd(5)-Ga(2) bond lengths are 2.65 Å. There is one shorter (2.56 Å) and two longer (2.67 Å) Pd(5)-Ga(4) bond lengths. In the sixth Pd site, Pd(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 Pd(6)-Ga(10) bond length is 2.64 Å. The Pd(6)-Ga(8) bond length is 2.55 Å. The Pd(6)-Ga(9) bond length is 2.73 Å. Both Pd(6)-Ga(1) bond lengths are 2.66 Å. Both Pd(6)-Ga(2) bond lengths are 2.67 Å. There are ten inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 4-coordinate geometry to one U(1), two equivalent Pd(3), and two equivalent Pd(6) atoms. In the second Ga site, Ga(2) is bonded in a 5-coordinate geometry to one U(1), one Pd(2), two equivalent Pd(5), and two equivalent Pd(6) atoms. In the third Ga site, Ga(3) is bonded in a 5-coordinate geometry to one Pd(4), two equivalent Pd(1), and two equivalent Pd(2) atoms. In the fourth Ga site, Ga(4) is bonded in a 6-coordinate geometry to two equivalent U(2), one Pd(3), and three equivalent Pd(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 Pd(3), two equivalent Pd(4), one Ga(6), one Ga(7), and two equivalent Ga(10) atoms. The Ga(5)-Ga(6) bond length is 2.93 Å. The Ga(5)-Ga(7) bond length is 2.81 Å. Both Ga(5)-Ga(10) bond lengths are 3.00 Å. In the sixth Ga site, Ga(6) is bonded in a 10-coordinate geometry to three equivalent U(1), three equivalent Pd(4), one Ga(5), one Ga(9), and two equivalent Ga(6) atoms. The Ga(6)-Ga(9) bond length is 2.80 Å. Both Ga(6)-Ga(6) bond lengths are 3.01 Å. In the seventh Ga site, Ga(7) is bonded in a 6-coordinate geometry to two equivalent U(2), one Pd(1), one Pd(5), two equivalent Pd(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 Pd(5), one Pd(6), and two equivalent Pd(3) atoms. In the ninth Ga site, Ga(9) is bonded in a 6-coordinate geometry to two equivalent U(1), one Pd(1), one Pd(6), two equivalent Pd(2), and one Ga(6) atom. In the tenth Ga site, Ga(10) is bonded in a 4-coordinate geometry to two equivalent U(1), one Pd(4), one Pd(6), two equivalent Pd(3), and two equivalent Ga(5) atoms.