UYB8 crystallizes in the orthorhombic Cmmm space group. U(1) is bonded in a 18-coordinate geometry to two equivalent B(3), four equivalent B(1), four equivalent B(2), four equivalent B(4), and four equivalent B(5) atoms. Y(1) is bonded in a 18-coordinate geometry to two equivalent B(4), four equivalent B(1), four equivalent B(2), four equivalent B(3), and four equivalent B(5) atoms. There are five inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent Y(1), one B(4), two equivalent B(2), and two equivalent B(5) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent Y(1), one B(3), two equivalent B(1), and two equivalent B(5) atoms. In the third B site, B(3) is bonded in a distorted trigonal planar geometry to two equivalent U(1), four equivalent Y(1), one B(3), and two equivalent B(2) atoms. In the fourth B site, B(4) is bonded in a distorted trigonal planar geometry to four equivalent U(1), two equivalent Y(1), one B(4), and two equivalent B(1) atoms. In the fifth B site, B(5) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent Y(1), one B(5), two equivalent B(1), and two equivalent B(2) atoms.
UYB8 crystallizes in the orthorhombic Cmmm space group. U(1) is bonded in a 18-coordinate geometry to two equivalent B(3), four equivalent B(1), four equivalent B(2), four equivalent B(4), and four equivalent B(5) atoms. Both U(1)-B(3) bond lengths are 2.99 Å. All U(1)-B(1) bond lengths are 2.71 Å. All U(1)-B(2) bond lengths are 2.76 Å. All U(1)-B(4) bond lengths are 2.88 Å. All U(1)-B(5) bond lengths are 2.70 Å. Y(1) is bonded in a 18-coordinate geometry to two equivalent B(4), four equivalent B(1), four equivalent B(2), four equivalent B(3), and four equivalent B(5) atoms. Both Y(1)-B(4) bond lengths are 3.03 Å. All Y(1)-B(1) bond lengths are 2.81 Å. All Y(1)-B(2) bond lengths are 2.74 Å. All Y(1)-B(3) bond lengths are 2.87 Å. All Y(1)-B(5) bond lengths are 2.71 Å. There are five inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent Y(1), one B(4), two equivalent B(2), and two equivalent B(5) atoms. The B(1)-B(4) bond length is 1.71 Å. There is one shorter (1.78 Å) and one longer (1.86 Å) B(1)-B(2) bond length. Both B(1)-B(5) bond lengths are 1.75 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent Y(1), one B(3), two equivalent B(1), and two equivalent B(5) atoms. The B(2)-B(3) bond length is 1.69 Å. Both B(2)-B(5) bond lengths are 1.75 Å. In the third B site, B(3) is bonded in a distorted trigonal planar geometry to two equivalent U(1), four equivalent Y(1), one B(3), and two equivalent B(2) atoms. The B(3)-B(3) bond length is 1.78 Å. In the fourth B site, B(4) is bonded in a distorted trigonal planar geometry to four equivalent U(1), two equivalent Y(1), one B(4), and two equivalent B(1) atoms. The B(4)-B(4) bond length is 1.73 Å. In the fifth B site, B(5) is bonded in a 9-coordinate geometry to two equivalent U(1), two equivalent Y(1), one B(5), two equivalent B(1), and two equivalent B(2) atoms. The B(5)-B(5) bond length is 1.60 Å.