YbMnCuP2 crystallizes in the trigonal P3m1 space group. Yb(1) is bonded to three equivalent P(1) and three equivalent P(2) atoms to form distorted YbP6 octahedra that share corners with six equivalent Mn(1)P4 tetrahedra, corners with six equivalent Cu(1)P4 tetrahedra, edges with six equivalent Yb(1)P6 octahedra, edges with three equivalent Mn(1)P4 tetrahedra, and edges with three equivalent Cu(1)P4 tetrahedra. Mn(1) is bonded to one P(2) and three equivalent P(1) atoms to form MnP4 tetrahedra that share corners with six equivalent Yb(1)P6 octahedra, corners with six equivalent Mn(1)P4 tetrahedra, edges with three equivalent Yb(1)P6 octahedra, and edges with three equivalent Cu(1)P4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-52°. Cu(1) is bonded to one P(1) and three equivalent P(2) atoms to form distorted CuP4 tetrahedra that share corners with six equivalent Yb(1)P6 octahedra, corners with six equivalent Cu(1)P4 tetrahedra, edges with three equivalent Yb(1)P6 octahedra, and edges with three equivalent Mn(1)P4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-50°. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 7-coordinate geometry to three equivalent Yb(1), three equivalent Mn(1), and one Cu(1) atom. In the second P site, P(2) is bonded in a 7-coordinate geometry to three equivalent Yb(1), one Mn(1), and three equivalent Cu(1) atoms.
YbMnCuP2 crystallizes in the trigonal P3m1 space group. Yb(1) is bonded to three equivalent P(1) and three equivalent P(2) atoms to form distorted YbP6 octahedra that share corners with six equivalent Mn(1)P4 tetrahedra, corners with six equivalent Cu(1)P4 tetrahedra, edges with six equivalent Yb(1)P6 octahedra, edges with three equivalent Mn(1)P4 tetrahedra, and edges with three equivalent Cu(1)P4 tetrahedra. All Yb(1)-P(1) bond lengths are 2.92 Å. All Yb(1)-P(2) bond lengths are 2.84 Å. Mn(1) is bonded to one P(2) and three equivalent P(1) atoms to form MnP4 tetrahedra that share corners with six equivalent Yb(1)P6 octahedra, corners with six equivalent Mn(1)P4 tetrahedra, edges with three equivalent Yb(1)P6 octahedra, and edges with three equivalent Cu(1)P4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-52°. The Mn(1)-P(2) bond length is 2.26 Å. All Mn(1)-P(1) bond lengths are 2.35 Å. Cu(1) is bonded to one P(1) and three equivalent P(2) atoms to form distorted CuP4 tetrahedra that share corners with six equivalent Yb(1)P6 octahedra, corners with six equivalent Cu(1)P4 tetrahedra, edges with three equivalent Yb(1)P6 octahedra, and edges with three equivalent Mn(1)P4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-50°. The Cu(1)-P(1) bond length is 2.34 Å. All Cu(1)-P(2) bond lengths are 2.33 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 7-coordinate geometry to three equivalent Yb(1), three equivalent Mn(1), and one Cu(1) atom. In the second P site, P(2) is bonded in a 7-coordinate geometry to three equivalent Yb(1), one Mn(1), and three equivalent Cu(1) atoms.