Sr4PbPt4O11 crystallizes in the triclinic P-1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), one O(3), one O(7), two equivalent O(10), and two equivalent O(6) atoms to form distorted SrO7 hexagonal pyramids that share corners with two equivalent Sr(4)O7 hexagonal pyramids, corners with two equivalent Pt(4)O5 square pyramids, edges with two equivalent Sr(1)O7 hexagonal pyramids,  an edgeedge with one Pt(4)O5 square pyramid, and  a faceface with one Sr(4)O7 hexagonal pyramid. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(6), two equivalent O(8), two equivalent O(9), and three equivalent O(5) atoms. In the third Sr site, Sr(3) is bonded in a 10-coordinate geometry to one O(1), one O(8), one O(9), two equivalent O(11), two equivalent O(4), and three equivalent O(2) atoms. In the fourth Sr site, Sr(4) is bonded to one O(1), one O(11), one O(4), two equivalent O(3), and two equivalent O(7) atoms to form distorted SrO7 hexagonal pyramids that share corners with two equivalent Sr(1)O7 hexagonal pyramids, edges with two equivalent Sr(4)O7 hexagonal pyramids,  an edgeedge with one Pt(3)O5 square pyramid, and  a faceface with one Sr(1)O7 hexagonal pyramid. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a rectangular see-saw-like geometry to one O(11), one O(3), one O(4), and one O(7) atom. In the second Pt site, Pt(2) is bonded in a rectangular see-saw-like geometry to one O(10), one O(3), one O(6), and one O(7) atom. In the third Pt site, Pt(3) is bonded to one O(11), one O(2), one O(4), one O(8), and one O(9) atom to form PtO5 square pyramids that share corners with two equivalent Pt(4)O5 square pyramids and  an edgeedge with one Sr(4)O7 hexagonal pyramid. In the fourth Pt site, Pt(4) is bonded to one O(10), one O(5), one O(6), one O(8), and one O(9) atom to form PtO5 square pyramids that share corners with two equivalent Sr(1)O7 hexagonal pyramids, corners with two equivalent Pt(3)O5 square pyramids, and  an edgeedge with one Sr(1)O7 hexagonal pyramid. Pb(1) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(5) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Pb(1) atom to form OSr4Pb square pyramids that share  a cornercorner with one O(3)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(4)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(6)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(7)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(8)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(9)Sr3Pt2 trigonal bipyramid, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(6)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(7)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(9)Sr3Pt2 trigonal bipyramid, and  an edgeedge with one O(2)Sr3PtPb trigonal bipyramid. In the second O site, O(2) is bonded to three equivalent Sr(3), one Pt(3), and one Pb(1) atom to form distorted OSr3PtPb trigonal bipyramids that share corners with two equivalent O(1)Sr4Pb square pyramids, corners with two equivalent O(4)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(8)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(9)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(9)Sr3Pt2 trigonal bipyramid, edges with two equivalent O(2)Sr3PtPb trigonal bipyramids, and  a faceface with one O(4)Sr3Pt2 trigonal bipyramid. In the third O site, O(3) is bonded to one Sr(1), two equivalent Sr(4), one Pt(1), and one Pt(2) atom to form OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid,  a cornercorner with one O(4)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(6)Sr3Pt2 trigonal bipyramid, corners with two equivalent O(7)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(6)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(7)Sr3Pt2 trigonal bipyramid, and  a faceface with one O(7)Sr3Pt2 trigonal bipyramid. In the fourth O site, O(4) is bonded to one Sr(4), two equivalent Sr(3), one Pt(1), and one Pt(3) atom to form distorted OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid,  a cornercorner with one O(3)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(8)Sr3Pt2 trigonal bipyramid, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids, corners with three equivalent O(7)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(9)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(2)Sr3PtPb trigonal bipyramid, and  a faceface with one O(2)Sr3PtPb trigonal bipyramid. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to three equivalent Sr(2), one Pt(4), and one Pb(1) atom. In the sixth O site, O(6) is bonded to one Sr(2), two equivalent Sr(1), one Pt(2), and one Pt(4) atom to form distorted OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid,  a cornercorner with one O(3)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(8)Sr3Pt2 trigonal bipyramid, corners with three equivalent O(7)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(9)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(6)Sr3Pt2 trigonal bipyramid, and  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid. In the seventh O site, O(7) is bonded to one Sr(1), two equivalent Sr(4), one Pt(1), and one Pt(2) atom to form OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid, corners with two equivalent O(3)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(4)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(6)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(7)Sr3Pt2 trigonal bipyramid, and  a faceface with one O(3)Sr3Pt2 trigonal bipyramid. In the eighth O site, O(8) is bonded to one Sr(3), two equivalent Sr(2), one Pt(3), and one Pt(4) atom to form distorted OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid,  a cornercorner with one O(4)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(6)Sr3Pt2 trigonal bipyramid, corners with two equivalent O(9)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(6)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(9)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(2)Sr3PtPb trigonal bipyramid, and  a faceface with one O(9)Sr3Pt2 trigonal bipyramid. In the ninth O site, O(9) is bonded to one Sr(3), two equivalent Sr(2), one Pt(3), and one Pt(4) atom to form distorted OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid, corners with two equivalent O(8)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids, corners with three equivalent O(4)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(6)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(9)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(2)Sr3PtPb trigonal bipyramid, and  a faceface with one O(8)Sr3Pt2 trigonal bipyramid. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(2), two equivalent Sr(1), one Pt(2), and one Pt(4) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(3), one Pt(1), and one Pt(3) atom.
Sr4PbPt4O11 crystallizes in the triclinic P-1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(1), one O(3), one O(7), two equivalent O(10), and two equivalent O(6) atoms to form distorted SrO7 hexagonal pyramids that share corners with two equivalent Sr(4)O7 hexagonal pyramids, corners with two equivalent Pt(4)O5 square pyramids, edges with two equivalent Sr(1)O7 hexagonal pyramids,  an edgeedge with one Pt(4)O5 square pyramid, and  a faceface with one Sr(4)O7 hexagonal pyramid. The Sr(1)-O(1) bond length is 2.59 Å. The Sr(1)-O(3) bond length is 2.71 Å. The Sr(1)-O(7) bond length is 2.73 Å. There is one shorter (2.56 Å) and one longer (2.58 Å) Sr(1)-O(10) bond length. There is one shorter (2.57 Å) and one longer (2.59 Å) Sr(1)-O(6) bond length. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(6), two equivalent O(8), two equivalent O(9), and three equivalent O(5) atoms. The Sr(2)-O(1) bond length is 2.63 Å. The Sr(2)-O(10) bond length is 3.05 Å. The Sr(2)-O(6) bond length is 3.00 Å. There is one shorter (2.58 Å) and one longer (2.74 Å) Sr(2)-O(8) bond length. There is one shorter (2.56 Å) and one longer (2.74 Å) Sr(2)-O(9) bond length. There are a spread of Sr(2)-O(5) bond distances ranging from 2.61-2.94 Å. In the third Sr site, Sr(3) is bonded in a 10-coordinate geometry to one O(1), one O(8), one O(9), two equivalent O(11), two equivalent O(4), and three equivalent O(2) atoms. The Sr(3)-O(1) bond length is 2.65 Å. The Sr(3)-O(8) bond length is 2.76 Å. The Sr(3)-O(9) bond length is 2.78 Å. There is one shorter (2.59 Å) and one longer (2.97 Å) Sr(3)-O(11) bond length. There is one shorter (2.61 Å) and one longer (2.94 Å) Sr(3)-O(4) bond length. There are a spread of Sr(3)-O(2) bond distances ranging from 2.56-2.90 Å. In the fourth Sr site, Sr(4) is bonded to one O(1), one O(11), one O(4), two equivalent O(3), and two equivalent O(7) atoms to form distorted SrO7 hexagonal pyramids that share corners with two equivalent Sr(1)O7 hexagonal pyramids, edges with two equivalent Sr(4)O7 hexagonal pyramids,  an edgeedge with one Pt(3)O5 square pyramid, and  a faceface with one Sr(1)O7 hexagonal pyramid. The Sr(4)-O(1) bond length is 2.62 Å. The Sr(4)-O(11) bond length is 2.56 Å. The Sr(4)-O(4) bond length is 2.55 Å. There is one shorter (2.63 Å) and one longer (2.65 Å) Sr(4)-O(3) bond length. There is one shorter (2.63 Å) and one longer (2.64 Å) Sr(4)-O(7) bond length. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a rectangular see-saw-like geometry to one O(11), one O(3), one O(4), and one O(7) atom. The Pt(1)-O(11) bond length is 2.04 Å. The Pt(1)-O(3) bond length is 2.06 Å. The Pt(1)-O(4) bond length is 2.04 Å. The Pt(1)-O(7) bond length is 2.05 Å. In the second Pt site, Pt(2) is bonded in a rectangular see-saw-like geometry to one O(10), one O(3), one O(6), and one O(7) atom. The Pt(2)-O(10) bond length is 2.05 Å. The Pt(2)-O(3) bond length is 2.06 Å. The Pt(2)-O(6) bond length is 2.05 Å. The Pt(2)-O(7) bond length is 2.06 Å. In the third Pt site, Pt(3) is bonded to one O(11), one O(2), one O(4), one O(8), and one O(9) atom to form PtO5 square pyramids that share corners with two equivalent Pt(4)O5 square pyramids and  an edgeedge with one Sr(4)O7 hexagonal pyramid. The Pt(3)-O(11) bond length is 2.05 Å. The Pt(3)-O(2) bond length is 2.02 Å. The Pt(3)-O(4) bond length is 2.05 Å. The Pt(3)-O(8) bond length is 2.05 Å. The Pt(3)-O(9) bond length is 2.05 Å. In the fourth Pt site, Pt(4) is bonded to one O(10), one O(5), one O(6), one O(8), and one O(9) atom to form PtO5 square pyramids that share corners with two equivalent Sr(1)O7 hexagonal pyramids, corners with two equivalent Pt(3)O5 square pyramids, and  an edgeedge with one Sr(1)O7 hexagonal pyramid. The Pt(4)-O(10) bond length is 2.07 Å. The Pt(4)-O(5) bond length is 2.02 Å. The Pt(4)-O(6) bond length is 2.07 Å. The Pt(4)-O(8) bond length is 2.03 Å. The Pt(4)-O(9) bond length is 2.03 Å. Pb(1) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(5) atom. The Pb(1)-O(1) bond length is 2.26 Å. The Pb(1)-O(2) bond length is 2.28 Å. The Pb(1)-O(5) bond length is 2.26 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Pb(1) atom to form OSr4Pb square pyramids that share  a cornercorner with one O(3)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(4)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(6)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(7)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(8)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(9)Sr3Pt2 trigonal bipyramid, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(6)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(7)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(9)Sr3Pt2 trigonal bipyramid, and  an edgeedge with one O(2)Sr3PtPb trigonal bipyramid. In the second O site, O(2) is bonded to three equivalent Sr(3), one Pt(3), and one Pb(1) atom to form distorted OSr3PtPb trigonal bipyramids that share corners with two equivalent O(1)Sr4Pb square pyramids, corners with two equivalent O(4)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(8)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(9)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(9)Sr3Pt2 trigonal bipyramid, edges with two equivalent O(2)Sr3PtPb trigonal bipyramids, and  a faceface with one O(4)Sr3Pt2 trigonal bipyramid. In the third O site, O(3) is bonded to one Sr(1), two equivalent Sr(4), one Pt(1), and one Pt(2) atom to form OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid,  a cornercorner with one O(4)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(6)Sr3Pt2 trigonal bipyramid, corners with two equivalent O(7)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(6)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(7)Sr3Pt2 trigonal bipyramid, and  a faceface with one O(7)Sr3Pt2 trigonal bipyramid. In the fourth O site, O(4) is bonded to one Sr(4), two equivalent Sr(3), one Pt(1), and one Pt(3) atom to form distorted OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid,  a cornercorner with one O(3)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(8)Sr3Pt2 trigonal bipyramid, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids, corners with three equivalent O(7)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(9)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(2)Sr3PtPb trigonal bipyramid, and  a faceface with one O(2)Sr3PtPb trigonal bipyramid. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to three equivalent Sr(2), one Pt(4), and one Pb(1) atom. In the sixth O site, O(6) is bonded to one Sr(2), two equivalent Sr(1), one Pt(2), and one Pt(4) atom to form distorted OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid,  a cornercorner with one O(3)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(8)Sr3Pt2 trigonal bipyramid, corners with three equivalent O(7)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(9)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(6)Sr3Pt2 trigonal bipyramid, and  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid. In the seventh O site, O(7) is bonded to one Sr(1), two equivalent Sr(4), one Pt(1), and one Pt(2) atom to form OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid, corners with two equivalent O(3)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(4)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(6)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(3)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(7)Sr3Pt2 trigonal bipyramid, and  a faceface with one O(3)Sr3Pt2 trigonal bipyramid. In the eighth O site, O(8) is bonded to one Sr(3), two equivalent Sr(2), one Pt(3), and one Pt(4) atom to form distorted OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid,  a cornercorner with one O(4)Sr3Pt2 trigonal bipyramid,  a cornercorner with one O(6)Sr3Pt2 trigonal bipyramid, corners with two equivalent O(9)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(4)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(6)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(9)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(2)Sr3PtPb trigonal bipyramid, and  a faceface with one O(9)Sr3Pt2 trigonal bipyramid. In the ninth O site, O(9) is bonded to one Sr(3), two equivalent Sr(2), one Pt(3), and one Pt(4) atom to form distorted OSr3Pt2 trigonal bipyramids that share  a cornercorner with one O(1)Sr4Pb square pyramid, corners with two equivalent O(8)Sr3Pt2 trigonal bipyramids, corners with two equivalent O(2)Sr3PtPb trigonal bipyramids, corners with three equivalent O(4)Sr3Pt2 trigonal bipyramids, corners with three equivalent O(6)Sr3Pt2 trigonal bipyramids,  an edgeedge with one O(1)Sr4Pb square pyramid,  an edgeedge with one O(8)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(9)Sr3Pt2 trigonal bipyramid,  an edgeedge with one O(2)Sr3PtPb trigonal bipyramid, and  a faceface with one O(8)Sr3Pt2 trigonal bipyramid. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Sr(2), two equivalent Sr(1), one Pt(2), and one Pt(4) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(3), one Pt(1), and one Pt(3) atom.