Nd(Re2Si)2 crystallizes in the orthorhombic Pnnm space group. Nd(1) is bonded in a 17-coordinate geometry to two equivalent Re(1), two equivalent Re(3), three equivalent Re(2), three equivalent Re(4), three equivalent Si(2), and four equivalent Si(1) atoms. There are four inequivalent Re sites. In the first Re site, Re(1) is bonded to two equivalent Nd(1), one Re(1), one Re(4), two equivalent Re(2), four equivalent Re(3), and two equivalent Si(1) atoms to form distorted ReNd2Re8Si2 cuboctahedra that share corners with five equivalent Re(4)Nd3Re6Si3 cuboctahedra, edges with three equivalent Re(1)Nd2Re8Si2 cuboctahedra, edges with four equivalent Re(4)Nd3Re6Si3 cuboctahedra, faces with two equivalent Re(4)Nd3Re6Si3 cuboctahedra, and faces with three equivalent Re(1)Nd2Re8Si2 cuboctahedra. In the second Re site, Re(2) is bonded in a 12-coordinate geometry to three equivalent Nd(1), one Re(3), two equivalent Re(1), three equivalent Re(4), one Si(1), and two equivalent Si(2) atoms. In the third Re site, Re(3) is bonded in a 13-coordinate geometry to two equivalent Nd(1), one Re(2), one Re(3), two equivalent Re(4), four equivalent Re(1), one Si(2), and two equivalent Si(1) atoms. In the fourth Re site, Re(4) is bonded to three equivalent Nd(1), one Re(1), two equivalent Re(3), three equivalent Re(2), and three equivalent Si(2) atoms to form distorted ReNd3Re6Si3 cuboctahedra that share corners with five equivalent Re(1)Nd2Re8Si2 cuboctahedra, edges with four equivalent Re(1)Nd2Re8Si2 cuboctahedra, faces with two equivalent Re(1)Nd2Re8Si2 cuboctahedra, and faces with six equivalent Re(4)Nd3Re6Si3 cuboctahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Nd(1), one Re(2), two equivalent Re(1), two equivalent Re(3), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Nd(1), one Re(3), two equivalent Re(2), and three equivalent Re(4) atoms.
Nd(Re2Si)2 crystallizes in the orthorhombic Pnnm space group. Nd(1) is bonded in a 17-coordinate geometry to two equivalent Re(1), two equivalent Re(3), three equivalent Re(2), three equivalent Re(4), three equivalent Si(2), and four equivalent Si(1) atoms. There is one shorter (3.35 Å) and one longer (3.40 Å) Nd(1)-Re(1) bond length. Both Nd(1)-Re(3) bond lengths are 3.36 Å. There is one shorter (3.32 Å) and two longer (3.43 Å) Nd(1)-Re(2) bond lengths. There is one shorter (3.30 Å) and two longer (3.48 Å) Nd(1)-Re(4) bond lengths. There are two shorter (3.10 Å) and one longer (3.18 Å) Nd(1)-Si(2) bond length. There are two shorter (3.12 Å) and two longer (3.15 Å) Nd(1)-Si(1) bond lengths. There are four inequivalent Re sites. In the first Re site, Re(1) is bonded to two equivalent Nd(1), one Re(1), one Re(4), two equivalent Re(2), four equivalent Re(3), and two equivalent Si(1) atoms to form distorted ReNd2Re8Si2 cuboctahedra that share corners with five equivalent Re(4)Nd3Re6Si3 cuboctahedra, edges with three equivalent Re(1)Nd2Re8Si2 cuboctahedra, edges with four equivalent Re(4)Nd3Re6Si3 cuboctahedra, faces with two equivalent Re(4)Nd3Re6Si3 cuboctahedra, and faces with three equivalent Re(1)Nd2Re8Si2 cuboctahedra. The Re(1)-Re(1) bond length is 2.56 Å. The Re(1)-Re(4) bond length is 2.61 Å. Both Re(1)-Re(2) bond lengths are 2.96 Å. There are two shorter (2.58 Å) and two longer (2.99 Å) Re(1)-Re(3) bond lengths. Both Re(1)-Si(1) bond lengths are 2.54 Å. In the second Re site, Re(2) is bonded in a 12-coordinate geometry to three equivalent Nd(1), one Re(3), two equivalent Re(1), three equivalent Re(4), one Si(1), and two equivalent Si(2) atoms. The Re(2)-Re(3) bond length is 2.65 Å. There is one shorter (2.58 Å) and two longer (2.74 Å) Re(2)-Re(4) bond lengths. The Re(2)-Si(1) bond length is 2.50 Å. Both Re(2)-Si(2) bond lengths are 2.59 Å. In the third Re site, Re(3) is bonded in a 13-coordinate geometry to two equivalent Nd(1), one Re(2), one Re(3), two equivalent Re(4), four equivalent Re(1), one Si(2), and two equivalent Si(1) atoms. The Re(3)-Re(3) bond length is 2.69 Å. Both Re(3)-Re(4) bond lengths are 2.89 Å. The Re(3)-Si(2) bond length is 2.47 Å. There is one shorter (2.52 Å) and one longer (2.96 Å) Re(3)-Si(1) bond length. In the fourth Re site, Re(4) is bonded to three equivalent Nd(1), one Re(1), two equivalent Re(3), three equivalent Re(2), and three equivalent Si(2) atoms to form distorted ReNd3Re6Si3 cuboctahedra that share corners with five equivalent Re(1)Nd2Re8Si2 cuboctahedra, edges with four equivalent Re(1)Nd2Re8Si2 cuboctahedra, faces with two equivalent Re(1)Nd2Re8Si2 cuboctahedra, and faces with six equivalent Re(4)Nd3Re6Si3 cuboctahedra. There is one shorter (2.43 Å) and two longer (2.55 Å) Re(4)-Si(2) bond lengths. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Nd(1), one Re(2), two equivalent Re(1), two equivalent Re(3), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.66 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to three equivalent Nd(1), one Re(3), two equivalent Re(2), and three equivalent Re(4) atoms.