Eu3Zn2(CuP2)2 crystallizes in the trigonal P-3m1 space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to six equivalent Cu(1) and six equivalent P(1) atoms to form face-sharing EuCu6P6 cuboctahedra. In the second Eu site, Eu(2) is bonded in a 9-coordinate geometry to three equivalent Cu(1), three equivalent P(1), and three equivalent P(2) atoms. Cu(1) is bonded in a distorted trigonal planar geometry to three equivalent Eu(1), three equivalent Eu(2), and three equivalent P(1) atoms. Zn(1) is bonded to four equivalent P(2) atoms to form a mixture of corner and edge-sharing ZnP4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to three equivalent Eu(1), three equivalent Eu(2), and three equivalent Cu(1) atoms. In the second P site, P(2) is bonded to three equivalent Eu(2) and four equivalent Zn(1) atoms to form distorted edge-sharing PEu3Zn4 pentagonal bipyramids.
Eu3Zn2(CuP2)2 crystallizes in the trigonal P-3m1 space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to six equivalent Cu(1) and six equivalent P(1) atoms to form face-sharing EuCu6P6 cuboctahedra. All Eu(1)-Cu(1) bond lengths are 3.13 Å. All Eu(1)-P(1) bond lengths are 3.12 Å. In the second Eu site, Eu(2) is bonded in a 9-coordinate geometry to three equivalent Cu(1), three equivalent P(1), and three equivalent P(2) atoms. All Eu(2)-Cu(1) bond lengths are 3.13 Å. All Eu(2)-P(1) bond lengths are 3.13 Å. All Eu(2)-P(2) bond lengths are 2.98 Å. Cu(1) is bonded in a distorted trigonal planar geometry to three equivalent Eu(1), three equivalent Eu(2), and three equivalent P(1) atoms. All Cu(1)-P(1) bond lengths are 2.36 Å. Zn(1) is bonded to four equivalent P(2) atoms to form a mixture of corner and edge-sharing ZnP4 tetrahedra. There are three shorter (2.46 Å) and one longer (2.50 Å) Zn(1)-P(2) bond length. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to three equivalent Eu(1), three equivalent Eu(2), and three equivalent Cu(1) atoms. In the second P site, P(2) is bonded to three equivalent Eu(2) and four equivalent Zn(1) atoms to form distorted edge-sharing PEu3Zn4 pentagonal bipyramids.