Eu3Pt7B2 crystallizes in the trigonal R-3m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 12-coordinate geometry to one Eu(2), three equivalent Pt(2), and nine equivalent Pt(1) atoms. In the second Eu site, Eu(2) is bonded in a 20-coordinate geometry to two equivalent Eu(1), twelve equivalent Pt(1), and six equivalent B(1) atoms. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a distorted L-shaped geometry to two equivalent Eu(2), three equivalent Eu(1), one Pt(2), and two equivalent B(1) atoms. In the second Pt site, Pt(2) is bonded to six equivalent Eu(1) and six equivalent Pt(1) atoms to form edge-sharing PtEu6Pt6 cuboctahedra. B(1) is bonded in a 6-coordinate geometry to three equivalent Eu(2) and six equivalent Pt(1) atoms.
Eu3Pt7B2 crystallizes in the trigonal R-3m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 12-coordinate geometry to one Eu(2), three equivalent Pt(2), and nine equivalent Pt(1) atoms. The Eu(1)-Eu(2) bond length is 3.31 Å. All Eu(1)-Pt(2) bond lengths are 3.25 Å. There are three shorter (3.28 Å) and six longer (3.31 Å) Eu(1)-Pt(1) bond lengths. In the second Eu site, Eu(2) is bonded in a 20-coordinate geometry to two equivalent Eu(1), twelve equivalent Pt(1), and six equivalent B(1) atoms. All Eu(2)-Pt(1) bond lengths are 3.16 Å. All Eu(2)-B(1) bond lengths are 3.21 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a distorted L-shaped geometry to two equivalent Eu(2), three equivalent Eu(1), one Pt(2), and two equivalent B(1) atoms. The Pt(1)-Pt(2) bond length is 2.82 Å. There is one shorter (2.17 Å) and one longer (2.22 Å) Pt(1)-B(1) bond length. In the second Pt site, Pt(2) is bonded to six equivalent Eu(1) and six equivalent Pt(1) atoms to form edge-sharing PtEu6Pt6 cuboctahedra. B(1) is bonded in a 6-coordinate geometry to three equivalent Eu(2) and six equivalent Pt(1) atoms.