SmPd3As2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 17-coordinate geometry to one Pd(3), two equivalent Pd(1), two equivalent Pd(4), three equivalent Pd(2), three equivalent Pd(5), two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the second Sm site, Sm(2) is bonded to two equivalent Pd(1), four equivalent Pd(3), two equivalent As(1), and four equivalent As(2) atoms to form SmAs6Pd6 cuboctahedra that share edges with four equivalent Pd(4)Sm4As4Pd4 cuboctahedra and faces with two equivalent Sm(2)As6Pd6 cuboctahedra. There are five inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a 12-coordinate geometry to one Sm(2), two equivalent Sm(1), one Pd(2), two equivalent Pd(3), two equivalent Pd(4), two equivalent As(2), and two equivalent As(3) atoms. In the second Pd site, Pd(2) is bonded in a 12-coordinate geometry to three equivalent Sm(1), one Pd(1), two equivalent Pd(2), two equivalent Pd(3), one As(1), and three equivalent As(3) atoms. In the third Pd site, Pd(3) is bonded in a 12-coordinate geometry to one Sm(1), two equivalent Sm(2), one Pd(5), two equivalent Pd(1), two equivalent Pd(2), one As(2), one As(3), and two equivalent As(1) atoms. In the fourth Pd site, Pd(4) is bonded to four equivalent Sm(1), four equivalent Pd(1), two equivalent As(2), and two equivalent As(3) atoms to form distorted PdSm4As4Pd4 cuboctahedra that share edges with four equivalent Sm(2)As6Pd6 cuboctahedra and faces with two equivalent Pd(4)Sm4As4Pd4 cuboctahedra. In the fifth Pd site, Pd(5) is bonded in a 6-coordinate geometry to three equivalent Sm(1), one Pd(3), one As(2), and three equivalent As(1) atoms. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to one Sm(2), two equivalent Sm(1), one Pd(2), two equivalent Pd(3), and three equivalent Pd(5) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Pd(3), one Pd(4), one Pd(5), and two equivalent Pd(1) atoms. In the third As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), one Pd(3), one Pd(4), two equivalent Pd(1), and three equivalent Pd(2) atoms.
SmPd3As2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 17-coordinate geometry to one Pd(3), two equivalent Pd(1), two equivalent Pd(4), three equivalent Pd(2), three equivalent Pd(5), two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. The Sm(1)-Pd(3) bond length is 3.54 Å. There is one shorter (3.19 Å) and one longer (3.60 Å) Sm(1)-Pd(1) bond length. Both Sm(1)-Pd(4) bond lengths are 3.41 Å. There are two shorter (3.22 Å) and one longer (3.63 Å) Sm(1)-Pd(2) bond length. There are two shorter (3.28 Å) and one longer (3.64 Å) Sm(1)-Pd(5) bond length. Both Sm(1)-As(1) bond lengths are 3.24 Å. Both Sm(1)-As(2) bond lengths are 3.10 Å. Both Sm(1)-As(3) bond lengths are 3.15 Å. In the second Sm site, Sm(2) is bonded to two equivalent Pd(1), four equivalent Pd(3), two equivalent As(1), and four equivalent As(2) atoms to form SmAs6Pd6 cuboctahedra that share edges with four equivalent Pd(4)Sm4As4Pd4 cuboctahedra and faces with two equivalent Sm(2)As6Pd6 cuboctahedra. Both Sm(2)-Pd(1) bond lengths are 3.18 Å. All Sm(2)-Pd(3) bond lengths are 3.15 Å. Both Sm(2)-As(1) bond lengths are 3.18 Å. All Sm(2)-As(2) bond lengths are 3.17 Å. There are five inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a 12-coordinate geometry to one Sm(2), two equivalent Sm(1), one Pd(2), two equivalent Pd(3), two equivalent Pd(4), two equivalent As(2), and two equivalent As(3) atoms. The Pd(1)-Pd(2) bond length is 2.86 Å. Both Pd(1)-Pd(3) bond lengths are 2.96 Å. Both Pd(1)-Pd(4) bond lengths are 2.88 Å. Both Pd(1)-As(2) bond lengths are 2.54 Å. Both Pd(1)-As(3) bond lengths are 2.63 Å. In the second Pd site, Pd(2) is bonded in a 12-coordinate geometry to three equivalent Sm(1), one Pd(1), two equivalent Pd(2), two equivalent Pd(3), one As(1), and three equivalent As(3) atoms. Both Pd(2)-Pd(2) bond lengths are 2.94 Å. Both Pd(2)-Pd(3) bond lengths are 2.93 Å. The Pd(2)-As(1) bond length is 2.51 Å. There is one shorter (2.40 Å) and two longer (2.68 Å) Pd(2)-As(3) bond lengths. In the third Pd site, Pd(3) is bonded in a 12-coordinate geometry to one Sm(1), two equivalent Sm(2), one Pd(5), two equivalent Pd(1), two equivalent Pd(2), one As(2), one As(3), and two equivalent As(1) atoms. The Pd(3)-Pd(5) bond length is 2.77 Å. The Pd(3)-As(2) bond length is 2.74 Å. The Pd(3)-As(3) bond length is 2.49 Å. Both Pd(3)-As(1) bond lengths are 2.61 Å. In the fourth Pd site, Pd(4) is bonded to four equivalent Sm(1), four equivalent Pd(1), two equivalent As(2), and two equivalent As(3) atoms to form distorted PdSm4As4Pd4 cuboctahedra that share edges with four equivalent Sm(2)As6Pd6 cuboctahedra and faces with two equivalent Pd(4)Sm4As4Pd4 cuboctahedra. Both Pd(4)-As(2) bond lengths are 2.75 Å. Both Pd(4)-As(3) bond lengths are 2.45 Å. In the fifth Pd site, Pd(5) is bonded in a 6-coordinate geometry to three equivalent Sm(1), one Pd(3), one As(2), and three equivalent As(1) atoms. The Pd(5)-As(2) bond length is 2.47 Å. There is one shorter (2.50 Å) and two longer (2.59 Å) Pd(5)-As(1) bond lengths. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to one Sm(2), two equivalent Sm(1), one Pd(2), two equivalent Pd(3), and three equivalent Pd(5) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Pd(3), one Pd(4), one Pd(5), and two equivalent Pd(1) atoms. In the third As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Sm(1), one Pd(3), one Pd(4), two equivalent Pd(1), and three equivalent Pd(2) atoms.