Sr2Pt3In4 crystallizes in the hexagonal P-62m space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 16-coordinate geometry to two equivalent Pt(1), four equivalent Pt(3), two equivalent In(1), two equivalent In(3), two equivalent In(4), and four equivalent In(2) atoms. In the second Sr site, Sr(2) is bonded in a 15-coordinate geometry to six equivalent Pt(2), three equivalent In(2), and six equivalent In(1) atoms. In the third Sr site, Sr(3) is bonded in a 13-coordinate geometry to one Pt(1), four equivalent Pt(2), two equivalent In(2), two equivalent In(4), and four equivalent In(1) atoms. There are three inequivalent Pt sites. In the first Pt site, Pt(3) is bonded in a 9-coordinate geometry to four equivalent Sr(1), one In(3), two equivalent In(2), and two equivalent In(4) atoms. In the second Pt site, Pt(1) is bonded in a 9-coordinate geometry to one Sr(3), two equivalent Sr(1), two equivalent In(2), and four equivalent In(1) atoms. In the third Pt site, Pt(2) is bonded in a 9-coordinate geometry to two equivalent Sr(2), two equivalent Sr(3), one In(4), two equivalent In(1), and two equivalent In(2) atoms. There are four inequivalent In sites. In the first In site, In(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the second In site, In(2) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), two equivalent Sr(1), one Pt(1), one Pt(3), and two equivalent Pt(2) atoms. In the third In site, In(3) is bonded in a distorted trigonal planar geometry to six equivalent Sr(1) and three equivalent Pt(3) atoms. In the fourth In site, In(4) is bonded to two equivalent Sr(1), two equivalent Sr(3), two equivalent Pt(2), and two equivalent Pt(3) atoms to form a mixture of distorted corner and edge-sharing InSr4Pt4 tetrahedra.
Sr2Pt3In4 crystallizes in the hexagonal P-62m space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 16-coordinate geometry to two equivalent Pt(1), four equivalent Pt(3), two equivalent In(1), two equivalent In(3), two equivalent In(4), and four equivalent In(2) atoms. Both Sr(1)-Pt(1) bond lengths are 3.33 Å. All Sr(1)-Pt(3) bond lengths are 3.54 Å. Both Sr(1)-In(1) bond lengths are 3.75 Å. Both Sr(1)-In(3) bond lengths are 3.57 Å. Both Sr(1)-In(4) bond lengths are 3.60 Å. All Sr(1)-In(2) bond lengths are 3.65 Å. In the second Sr site, Sr(2) is bonded in a 15-coordinate geometry to six equivalent Pt(2), three equivalent In(2), and six equivalent In(1) atoms. All Sr(2)-Pt(2) bond lengths are 3.44 Å. All Sr(2)-In(2) bond lengths are 3.67 Å. All Sr(2)-In(1) bond lengths are 3.71 Å. In the third Sr site, Sr(3) is bonded in a 13-coordinate geometry to one Pt(1), four equivalent Pt(2), two equivalent In(2), two equivalent In(4), and four equivalent In(1) atoms. The Sr(3)-Pt(1) bond length is 2.94 Å. All Sr(3)-Pt(2) bond lengths are 3.23 Å. Both Sr(3)-In(2) bond lengths are 3.34 Å. Both Sr(3)-In(4) bond lengths are 3.40 Å. All Sr(3)-In(1) bond lengths are 3.41 Å. There are three inequivalent Pt sites. In the first Pt site, Pt(3) is bonded in a 9-coordinate geometry to four equivalent Sr(1), one In(3), two equivalent In(2), and two equivalent In(4) atoms. The Pt(3)-In(3) bond length is 2.67 Å. Both Pt(3)-In(2) bond lengths are 2.81 Å. Both Pt(3)-In(4) bond lengths are 2.68 Å. In the second Pt site, Pt(1) is bonded in a 9-coordinate geometry to one Sr(3), two equivalent Sr(1), two equivalent In(2), and four equivalent In(1) atoms. Both Pt(1)-In(2) bond lengths are 2.70 Å. All Pt(1)-In(1) bond lengths are 2.94 Å. In the third Pt site, Pt(2) is bonded in a 9-coordinate geometry to two equivalent Sr(2), two equivalent Sr(3), one In(4), two equivalent In(1), and two equivalent In(2) atoms. The Pt(2)-In(4) bond length is 2.80 Å. There is one shorter (2.75 Å) and one longer (2.79 Å) Pt(2)-In(1) bond length. Both Pt(2)-In(2) bond lengths are 2.80 Å. There are four inequivalent In sites. In the first In site, In(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the second In site, In(2) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(3), two equivalent Sr(1), one Pt(1), one Pt(3), and two equivalent Pt(2) atoms. In the third In site, In(3) is bonded in a distorted trigonal planar geometry to six equivalent Sr(1) and three equivalent Pt(3) atoms. In the fourth In site, In(4) is bonded to two equivalent Sr(1), two equivalent Sr(3), two equivalent Pt(2), and two equivalent Pt(3) atoms to form a mixture of distorted corner and edge-sharing InSr4Pt4 tetrahedra.