Ta(MnB2)2 crystallizes in the orthorhombic Immm space group. Ta(1) is bonded to four equivalent B(1) and eight equivalent B(2) atoms to form a mixture of face and edge-sharing TaB12 cuboctahedra. Mn(1) is bonded in a 7-coordinate geometry to two equivalent B(2) and five equivalent B(1) atoms. There are two inequivalent B sites. In the first B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Ta(1), two equivalent Mn(1), one B(2), and two equivalent B(1) atoms. In the second B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Ta(1), five equivalent Mn(1), and two equivalent B(2) atoms.
Ta(MnB2)2 crystallizes in the orthorhombic Immm space group. Ta(1) is bonded to four equivalent B(1) and eight equivalent B(2) atoms to form a mixture of face and edge-sharing TaB12 cuboctahedra. All Ta(1)-B(1) bond lengths are 2.45 Å. All Ta(1)-B(2) bond lengths are 2.37 Å. Mn(1) is bonded in a 7-coordinate geometry to two equivalent B(2) and five equivalent B(1) atoms. Both Mn(1)-B(2) bond lengths are 2.19 Å. There is one shorter (2.16 Å) and four longer (2.26 Å) Mn(1)-B(1) bond lengths. There are two inequivalent B sites. In the first B site, B(2) is bonded in a 9-coordinate geometry to four equivalent Ta(1), two equivalent Mn(1), one B(2), and two equivalent B(1) atoms. The B(2)-B(2) bond length is 1.84 Å. Both B(2)-B(1) bond lengths are 1.79 Å. In the second B site, B(1) is bonded in a 9-coordinate geometry to two equivalent Ta(1), five equivalent Mn(1), and two equivalent B(2) atoms.