Er3Pt4 crystallizes in the triclinic P-1 space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 9-coordinate geometry to one Pt(1), one Pt(2), two equivalent Pt(3), two equivalent Pt(5), and three equivalent Pt(4) atoms. In the second Er site, Er(2) is bonded in a 9-coordinate geometry to one Pt(1), one Pt(2), two equivalent Pt(3), two equivalent Pt(4), and three equivalent Pt(5) atoms. In the third Er site, Er(3) is bonded in a 9-coordinate geometry to one Pt(1), one Pt(2), two equivalent Pt(4), two equivalent Pt(5), and three equivalent Pt(3) atoms. There are five inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 6-coordinate geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Er(3) atoms. In the second Pt site, Pt(2) is bonded in a distorted octahedral geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Er(3) atoms. In the third Pt site, Pt(3) is bonded in a 10-coordinate geometry to two equivalent Er(1), two equivalent Er(2), three equivalent Er(3), one Pt(3), one Pt(4), and one Pt(5) atom. In the fourth Pt site, Pt(4) is bonded in a 10-coordinate geometry to two equivalent Er(2), two equivalent Er(3), three equivalent Er(1), one Pt(3), one Pt(4), and one Pt(5) atom. In the fifth Pt site, Pt(5) is bonded in a 10-coordinate geometry to two equivalent Er(1), two equivalent Er(3), three equivalent Er(2), one Pt(3), one Pt(4), and one Pt(5) atom.
Er3Pt4 crystallizes in the triclinic P-1 space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 9-coordinate geometry to one Pt(1), one Pt(2), two equivalent Pt(3), two equivalent Pt(5), and three equivalent Pt(4) atoms. The Er(1)-Pt(1) bond length is 2.84 Å. The Er(1)-Pt(2) bond length is 2.91 Å. There is one shorter (2.94 Å) and one longer (3.09 Å) Er(1)-Pt(3) bond length. There is one shorter (2.82 Å) and one longer (2.97 Å) Er(1)-Pt(5) bond length. There are a spread of Er(1)-Pt(4) bond distances ranging from 2.83-3.27 Å. In the second Er site, Er(2) is bonded in a 9-coordinate geometry to one Pt(1), one Pt(2), two equivalent Pt(3), two equivalent Pt(4), and three equivalent Pt(5) atoms. The Er(2)-Pt(1) bond length is 2.84 Å. The Er(2)-Pt(2) bond length is 2.91 Å. There is one shorter (2.82 Å) and one longer (2.97 Å) Er(2)-Pt(3) bond length. There is one shorter (2.95 Å) and one longer (3.09 Å) Er(2)-Pt(4) bond length. There are a spread of Er(2)-Pt(5) bond distances ranging from 2.83-3.27 Å. In the third Er site, Er(3) is bonded in a 9-coordinate geometry to one Pt(1), one Pt(2), two equivalent Pt(4), two equivalent Pt(5), and three equivalent Pt(3) atoms. The Er(3)-Pt(1) bond length is 2.85 Å. The Er(3)-Pt(2) bond length is 2.92 Å. There is one shorter (2.82 Å) and one longer (2.97 Å) Er(3)-Pt(4) bond length. There is one shorter (2.94 Å) and one longer (3.10 Å) Er(3)-Pt(5) bond length. There are a spread of Er(3)-Pt(3) bond distances ranging from 2.83-3.27 Å. There are five inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 6-coordinate geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Er(3) atoms. In the second Pt site, Pt(2) is bonded in a distorted octahedral geometry to two equivalent Er(1), two equivalent Er(2), and two equivalent Er(3) atoms. In the third Pt site, Pt(3) is bonded in a 10-coordinate geometry to two equivalent Er(1), two equivalent Er(2), three equivalent Er(3), one Pt(3), one Pt(4), and one Pt(5) atom. The Pt(3)-Pt(3) bond length is 2.88 Å. The Pt(3)-Pt(4) bond length is 2.93 Å. The Pt(3)-Pt(5) bond length is 2.93 Å. In the fourth Pt site, Pt(4) is bonded in a 10-coordinate geometry to two equivalent Er(2), two equivalent Er(3), three equivalent Er(1), one Pt(3), one Pt(4), and one Pt(5) atom. The Pt(4)-Pt(4) bond length is 2.88 Å. The Pt(4)-Pt(5) bond length is 2.93 Å. In the fifth Pt site, Pt(5) is bonded in a 10-coordinate geometry to two equivalent Er(1), two equivalent Er(3), three equivalent Er(2), one Pt(3), one Pt(4), and one Pt(5) atom. The Pt(5)-Pt(5) bond length is 2.88 Å.