Nd2Rh2CuSi3 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 14-coordinate geometry to two equivalent Rh(1), two equivalent Rh(2), two equivalent Cu(1), four equivalent Si(1), and four equivalent Si(3) atoms. In the second Nd site, Nd(2) is bonded in a 14-coordinate geometry to two equivalent Rh(1), two equivalent Rh(2), four equivalent Cu(1), two equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to two equivalent Nd(1), two equivalent Nd(2), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing RhNd4Si4 tetrahedra. In the second Rh site, Rh(2) is bonded to two equivalent Nd(1), two equivalent Nd(2), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing RhNd4Si4 tetrahedra. Cu(1) is bonded in a 9-coordinate geometry to two equivalent Nd(1), four equivalent Nd(2), one Si(2), and two equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Nd(2), four equivalent Nd(1), two equivalent Cu(1), and one Si(3) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Nd(2), two equivalent Rh(1), two equivalent Rh(2), and one Cu(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to four equivalent Nd(1), two equivalent Rh(1), two equivalent Rh(2), and one Si(1) atom.
Nd2Rh2CuSi3 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 14-coordinate geometry to two equivalent Rh(1), two equivalent Rh(2), two equivalent Cu(1), four equivalent Si(1), and four equivalent Si(3) atoms. Both Nd(1)-Rh(1) bond lengths are 3.27 Å. Both Nd(1)-Rh(2) bond lengths are 3.26 Å. Both Nd(1)-Cu(1) bond lengths are 3.13 Å. All Nd(1)-Si(1) bond lengths are 3.14 Å. All Nd(1)-Si(3) bond lengths are 3.17 Å. In the second Nd site, Nd(2) is bonded in a 14-coordinate geometry to two equivalent Rh(1), two equivalent Rh(2), four equivalent Cu(1), two equivalent Si(1), and four equivalent Si(2) atoms. Both Nd(2)-Rh(1) bond lengths are 3.26 Å. Both Nd(2)-Rh(2) bond lengths are 3.27 Å. All Nd(2)-Cu(1) bond lengths are 3.14 Å. Both Nd(2)-Si(1) bond lengths are 3.12 Å. All Nd(2)-Si(2) bond lengths are 3.17 Å. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to two equivalent Nd(1), two equivalent Nd(2), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing RhNd4Si4 tetrahedra. Both Rh(1)-Si(2) bond lengths are 2.43 Å. Both Rh(1)-Si(3) bond lengths are 2.42 Å. In the second Rh site, Rh(2) is bonded to two equivalent Nd(1), two equivalent Nd(2), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing RhNd4Si4 tetrahedra. Both Rh(2)-Si(2) bond lengths are 2.42 Å. Both Rh(2)-Si(3) bond lengths are 2.43 Å. Cu(1) is bonded in a 9-coordinate geometry to two equivalent Nd(1), four equivalent Nd(2), one Si(2), and two equivalent Si(1) atoms. The Cu(1)-Si(2) bond length is 2.42 Å. Both Cu(1)-Si(1) bond lengths are 2.36 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Nd(2), four equivalent Nd(1), two equivalent Cu(1), and one Si(3) atom. The Si(1)-Si(3) bond length is 2.44 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Nd(2), two equivalent Rh(1), two equivalent Rh(2), and one Cu(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to four equivalent Nd(1), two equivalent Rh(1), two equivalent Rh(2), and one Si(1) atom.