SmReB4 crystallizes in the orthorhombic Pbam space group. Sm(1) is bonded in a 18-coordinate geometry to four equivalent Re(1), two equivalent B(1), four equivalent B(2), four equivalent B(3), and four equivalent B(4) atoms. Re(1) is bonded in a 15-coordinate geometry to four equivalent Sm(1), one Re(1), two equivalent B(2), two equivalent B(3), two equivalent B(4), and four equivalent B(1) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Re(1), one B(1), one B(2), and one B(3) atom. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Sm(1), two equivalent Re(1), one B(1), one B(2), and one B(4) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Sm(1), two equivalent Re(1), one B(1), and two equivalent B(4) atoms. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to four equivalent Sm(1), two equivalent Re(1), one B(2), and two equivalent B(3) atoms.
SmReB4 crystallizes in the orthorhombic Pbam space group. Sm(1) is bonded in a 18-coordinate geometry to four equivalent Re(1), two equivalent B(1), four equivalent B(2), four equivalent B(3), and four equivalent B(4) atoms. There are a spread of Sm(1)-Re(1) bond distances ranging from 3.07-3.14 Å. Both Sm(1)-B(1) bond lengths are 2.71 Å. There are two shorter (2.79 Å) and two longer (2.81 Å) Sm(1)-B(2) bond lengths. There are two shorter (2.76 Å) and two longer (2.84 Å) Sm(1)-B(3) bond lengths. There are two shorter (2.78 Å) and two longer (2.83 Å) Sm(1)-B(4) bond lengths. Re(1) is bonded in a 15-coordinate geometry to four equivalent Sm(1), one Re(1), two equivalent B(2), two equivalent B(3), two equivalent B(4), and four equivalent B(1) atoms. The Re(1)-Re(1) bond length is 2.55 Å. Both Re(1)-B(2) bond lengths are 2.38 Å. Both Re(1)-B(3) bond lengths are 2.38 Å. Both Re(1)-B(4) bond lengths are 2.34 Å. There are two shorter (2.39 Å) and two longer (2.40 Å) Re(1)-B(1) bond lengths. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Sm(1), four equivalent Re(1), one B(1), one B(2), and one B(3) atom. The B(1)-B(1) bond length is 1.74 Å. The B(1)-B(2) bond length is 1.75 Å. The B(1)-B(3) bond length is 1.76 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Sm(1), two equivalent Re(1), one B(1), one B(2), and one B(4) atom. The B(2)-B(2) bond length is 1.84 Å. The B(2)-B(4) bond length is 1.83 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Sm(1), two equivalent Re(1), one B(1), and two equivalent B(4) atoms. There is one shorter (1.86 Å) and one longer (1.87 Å) B(3)-B(4) bond length. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to four equivalent Sm(1), two equivalent Re(1), one B(2), and two equivalent B(3) atoms.