SrPtGe3 crystallizes in the tetragonal I4mm space group. Sr(1) is bonded in a 17-coordinate geometry to five equivalent Pt(1), four equivalent Ge(2), and eight equivalent Ge(1) atoms. Pt(1) is bonded in a 5-coordinate geometry to five equivalent Sr(1), one Ge(2), and four equivalent Ge(1) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to four equivalent Sr(1), two equivalent Pt(1), and two equivalent Ge(2) atoms. In the second Ge site, Ge(2) is bonded in a distorted single-bond geometry to four equivalent Sr(1), one Pt(1), and four equivalent Ge(1) atoms.
SrPtGe3 crystallizes in the tetragonal I4mm space group. Sr(1) is bonded in a 17-coordinate geometry to five equivalent Pt(1), four equivalent Ge(2), and eight equivalent Ge(1) atoms. There are four shorter (3.52 Å) and one longer (3.58 Å) Sr(1)-Pt(1) bond length. All Sr(1)-Ge(2) bond lengths are 3.34 Å. There are four shorter (3.35 Å) and four longer (3.43 Å) Sr(1)-Ge(1) bond lengths. Pt(1) is bonded in a 5-coordinate geometry to five equivalent Sr(1), one Ge(2), and four equivalent Ge(1) atoms. The Pt(1)-Ge(2) bond length is 2.48 Å. All Pt(1)-Ge(1) bond lengths are 2.51 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to four equivalent Sr(1), two equivalent Pt(1), and two equivalent Ge(2) atoms. Both Ge(1)-Ge(2) bond lengths are 2.70 Å. In the second Ge site, Ge(2) is bonded in a distorted single-bond geometry to four equivalent Sr(1), one Pt(1), and four equivalent Ge(1) atoms.