Er2PtGe6 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to two equivalent Ge(2), two equivalent Ge(4), two equivalent Ge(5), and four equivalent Ge(6) atoms. In the second Er site, Er(2) is bonded in a 14-coordinate geometry to four equivalent Pt(1), two equivalent Ge(1), two equivalent Ge(3), two equivalent Ge(6), and four equivalent Ge(5) atoms. Pt(1) is bonded in a 9-coordinate geometry to four equivalent Er(2), one Ge(5), two equivalent Ge(1), and two equivalent Ge(3) atoms. There are six inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), two equivalent Pt(1), one Ge(2), and four equivalent Ge(3) atoms. In the second Ge site, Ge(2) is bonded in a 7-coordinate geometry to two equivalent Er(1), one Ge(1), and four equivalent Ge(4) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Er(2), two equivalent Pt(1), one Ge(4), and four equivalent Ge(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 7-coordinate geometry to two equivalent Er(1), one Ge(3), and four equivalent Ge(2) atoms. In the fifth Ge site, Ge(5) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Pt(1), and two equivalent Ge(6) atoms. In the sixth Ge site, Ge(6) is bonded in a 8-coordinate geometry to two equivalent Er(2), four equivalent Er(1), and two equivalent Ge(5) atoms.
Er2PtGe6 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to two equivalent Ge(2), two equivalent Ge(4), two equivalent Ge(5), and four equivalent Ge(6) atoms. Both Er(1)-Ge(2) bond lengths are 3.00 Å. Both Er(1)-Ge(4) bond lengths are 2.99 Å. Both Er(1)-Ge(5) bond lengths are 3.12 Å. All Er(1)-Ge(6) bond lengths are 2.99 Å. In the second Er site, Er(2) is bonded in a 14-coordinate geometry to four equivalent Pt(1), two equivalent Ge(1), two equivalent Ge(3), two equivalent Ge(6), and four equivalent Ge(5) atoms. All Er(2)-Pt(1) bond lengths are 3.14 Å. Both Er(2)-Ge(1) bond lengths are 3.39 Å. Both Er(2)-Ge(3) bond lengths are 3.42 Å. Both Er(2)-Ge(6) bond lengths are 3.40 Å. All Er(2)-Ge(5) bond lengths are 3.11 Å. Pt(1) is bonded in a 9-coordinate geometry to four equivalent Er(2), one Ge(5), two equivalent Ge(1), and two equivalent Ge(3) atoms. The Pt(1)-Ge(5) bond length is 2.42 Å. Both Pt(1)-Ge(1) bond lengths are 2.51 Å. Both Pt(1)-Ge(3) bond lengths are 2.51 Å. There are six inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), two equivalent Pt(1), one Ge(2), and four equivalent Ge(3) atoms. The Ge(1)-Ge(2) bond length is 2.51 Å. All Ge(1)-Ge(3) bond lengths are 2.88 Å. In the second Ge site, Ge(2) is bonded in a 7-coordinate geometry to two equivalent Er(1), one Ge(1), and four equivalent Ge(4) atoms. All Ge(2)-Ge(4) bond lengths are 2.88 Å. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Er(2), two equivalent Pt(1), one Ge(4), and four equivalent Ge(1) atoms. The Ge(3)-Ge(4) bond length is 2.51 Å. In the fourth Ge site, Ge(4) is bonded in a 7-coordinate geometry to two equivalent Er(1), one Ge(3), and four equivalent Ge(2) atoms. In the fifth Ge site, Ge(5) is bonded in a 9-coordinate geometry to two equivalent Er(1), four equivalent Er(2), one Pt(1), and two equivalent Ge(6) atoms. Both Ge(5)-Ge(6) bond lengths are 2.56 Å. In the sixth Ge site, Ge(6) is bonded in a 8-coordinate geometry to two equivalent Er(2), four equivalent Er(1), and two equivalent Ge(5) atoms.