Eu2Zn2As3 crystallizes in the monoclinic C2/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one As(2), two equivalent As(1), and three equivalent As(3) atoms to form EuAs6 octahedra that share corners with three equivalent Zn(1)Eu2As4 tetrahedra, corners with four equivalent Zn(2)EuAs4 tetrahedra, edges with four equivalent Eu(1)As6 octahedra, edges with two equivalent Zn(2)EuAs4 tetrahedra, and edges with three equivalent Zn(1)Eu2As4 tetrahedra. In the second Eu site, Eu(2) is bonded in a 10-coordinate geometry to one Zn(2), two equivalent Zn(1), three equivalent As(2), and four equivalent As(1) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent Eu(2), one As(1), one As(2), and two equivalent As(3) atoms to form distorted ZnEu2As4 tetrahedra that share corners with three equivalent Eu(1)As6 octahedra, corners with two equivalent Zn(2)EuAs4 tetrahedra, edges with three equivalent Eu(1)As6 octahedra, edges with two equivalent Zn(1)Eu2As4 tetrahedra, and faces with two equivalent Zn(2)EuAs4 tetrahedra. The corner-sharing octahedral tilt angles range from 19-52°. In the second Zn site, Zn(2) is bonded to one Eu(2), two equivalent As(2), and two equivalent As(3) atoms to form distorted ZnEuAs4 tetrahedra that share corners with four equivalent Eu(1)As6 octahedra, corners with two equivalent Zn(1)Eu2As4 tetrahedra, corners with two equivalent Zn(2)EuAs4 tetrahedra, edges with two equivalent Eu(1)As6 octahedra,  an edgeedge with one Zn(2)EuAs4 tetrahedra, and faces with two equivalent Zn(1)Eu2As4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-56°. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), one Zn(1), and one As(1) atom. In the second As site, As(2) is bonded in a 7-coordinate geometry to one Eu(1), three equivalent Eu(2), one Zn(1), and two equivalent Zn(2) atoms. In the third As site, As(3) is bonded to three equivalent Eu(1), two equivalent Zn(1), and two equivalent Zn(2) atoms to form distorted edge-sharing AsEu3Zn4 pentagonal bipyramids.
Eu2Zn2As3 crystallizes in the monoclinic C2/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one As(2), two equivalent As(1), and three equivalent As(3) atoms to form EuAs6 octahedra that share corners with three equivalent Zn(1)Eu2As4 tetrahedra, corners with four equivalent Zn(2)EuAs4 tetrahedra, edges with four equivalent Eu(1)As6 octahedra, edges with two equivalent Zn(2)EuAs4 tetrahedra, and edges with three equivalent Zn(1)Eu2As4 tetrahedra. The Eu(1)-As(2) bond length is 3.08 Å. Both Eu(1)-As(1) bond lengths are 3.08 Å. There is one shorter (3.04 Å) and two longer (3.07 Å) Eu(1)-As(3) bond lengths. In the second Eu site, Eu(2) is bonded in a 10-coordinate geometry to one Zn(2), two equivalent Zn(1), three equivalent As(2), and four equivalent As(1) atoms. The Eu(2)-Zn(2) bond length is 3.40 Å. Both Eu(2)-Zn(1) bond lengths are 3.35 Å. All Eu(2)-As(2) bond lengths are 3.15 Å. There are two shorter (3.22 Å) and two longer (3.32 Å) Eu(2)-As(1) bond lengths. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent Eu(2), one As(1), one As(2), and two equivalent As(3) atoms to form distorted ZnEu2As4 tetrahedra that share corners with three equivalent Eu(1)As6 octahedra, corners with two equivalent Zn(2)EuAs4 tetrahedra, edges with three equivalent Eu(1)As6 octahedra, edges with two equivalent Zn(1)Eu2As4 tetrahedra, and faces with two equivalent Zn(2)EuAs4 tetrahedra. The corner-sharing octahedral tilt angles range from 19-52°. The Zn(1)-As(1) bond length is 2.64 Å. The Zn(1)-As(2) bond length is 2.60 Å. Both Zn(1)-As(3) bond lengths are 2.56 Å. In the second Zn site, Zn(2) is bonded to one Eu(2), two equivalent As(2), and two equivalent As(3) atoms to form distorted ZnEuAs4 tetrahedra that share corners with four equivalent Eu(1)As6 octahedra, corners with two equivalent Zn(1)Eu2As4 tetrahedra, corners with two equivalent Zn(2)EuAs4 tetrahedra, edges with two equivalent Eu(1)As6 octahedra,  an edgeedge with one Zn(2)EuAs4 tetrahedra, and faces with two equivalent Zn(1)Eu2As4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-56°. Both Zn(2)-As(2) bond lengths are 2.59 Å. There is one shorter (2.55 Å) and one longer (2.70 Å) Zn(2)-As(3) bond length. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), one Zn(1), and one As(1) atom. The As(1)-As(1) bond length is 2.58 Å. In the second As site, As(2) is bonded in a 7-coordinate geometry to one Eu(1), three equivalent Eu(2), one Zn(1), and two equivalent Zn(2) atoms. In the third As site, As(3) is bonded to three equivalent Eu(1), two equivalent Zn(1), and two equivalent Zn(2) atoms to form distorted edge-sharing AsEu3Zn4 pentagonal bipyramids.