Er5(PtIn2)2 crystallizes in the orthorhombic Pbam space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 2-coordinate geometry to two equivalent Pt(1), two equivalent In(1), and four equivalent In(2) atoms. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to four equivalent Pt(1), two equivalent In(2), and four equivalent In(1) atoms. In the third Er site, Er(3) is bonded in a distorted body-centered cubic geometry to four equivalent In(1) and four equivalent In(2) atoms. Pt(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one In(2), and two equivalent In(1) atoms. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Er(1), two equivalent Er(3), four equivalent Er(2), two equivalent Pt(1), and one In(2) atom. In the second In site, In(2) is bonded in a 10-coordinate geometry to two equivalent Er(2), two equivalent Er(3), four equivalent Er(1), one Pt(1), and one In(1) atom.
Er5(PtIn2)2 crystallizes in the orthorhombic Pbam space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 2-coordinate geometry to two equivalent Pt(1), two equivalent In(1), and four equivalent In(2) atoms. Both Er(1)-Pt(1) bond lengths are 2.79 Å. Both Er(1)-In(1) bond lengths are 3.27 Å. There are two shorter (3.17 Å) and two longer (3.37 Å) Er(1)-In(2) bond lengths. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to four equivalent Pt(1), two equivalent In(2), and four equivalent In(1) atoms. There are two shorter (2.91 Å) and two longer (2.92 Å) Er(2)-Pt(1) bond lengths. Both Er(2)-In(2) bond lengths are 3.33 Å. There are two shorter (3.30 Å) and two longer (3.39 Å) Er(2)-In(1) bond lengths. In the third Er site, Er(3) is bonded in a distorted body-centered cubic geometry to four equivalent In(1) and four equivalent In(2) atoms. All Er(3)-In(1) bond lengths are 3.27 Å. All Er(3)-In(2) bond lengths are 3.17 Å. Pt(1) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one In(2), and two equivalent In(1) atoms. The Pt(1)-In(2) bond length is 2.99 Å. There is one shorter (2.93 Å) and one longer (3.29 Å) Pt(1)-In(1) bond length. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 11-coordinate geometry to two equivalent Er(1), two equivalent Er(3), four equivalent Er(2), two equivalent Pt(1), and one In(2) atom. The In(1)-In(2) bond length is 3.24 Å. In the second In site, In(2) is bonded in a 10-coordinate geometry to two equivalent Er(2), two equivalent Er(3), four equivalent Er(1), one Pt(1), and one In(1) atom.