La2Pt2O7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(1), one O(11), one O(3), one O(4), one O(9), two equivalent O(13), and two equivalent O(6) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(12), one O(3), one O(8), two equivalent O(2), and two equivalent O(5) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(14), one O(6), one O(7), and one O(9) atom. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(2), one O(5), one O(7), one O(8), and two equivalent O(12) atoms. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(7) atom to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles range from 35-38°. In the second Pt site, Pt(2) is bonded to one O(1), one O(11), one O(4), one O(7), and two equivalent O(6) atoms to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles range from 29-38°. In the third Pt site, Pt(3) is bonded to one O(10), one O(12), one O(14), one O(3), one O(8), and one O(9) atom to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles range from 35-39°. In the fourth Pt site, Pt(4) is bonded to one O(11), one O(14), one O(4), one O(9), and two equivalent O(13) atoms to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles range from 29-39°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(3), one Pt(1), and one Pt(2) atom to form distorted OLa2Pt2 tetrahedra that share  a cornercorner with one O(11)La2Pt2 tetrahedra,  a cornercorner with one O(2)La3Pt tetrahedra,  a cornercorner with one O(5)La3Pt tetrahedra, corners with two equivalent O(9)La2Pt2 tetrahedra,  an edgeedge with one O(11)La2Pt2 tetrahedra, and  an edgeedge with one O(10)La2Pt2 trigonal pyramid. In the second O site, O(2) is bonded to one La(4), two equivalent La(2), and one Pt(1) atom to form OLa3Pt tetrahedra that share  a cornercorner with one O(1)La2Pt2 tetrahedra, corners with two equivalent O(12)La3Pt tetrahedra, corners with two equivalent O(2)La3Pt tetrahedra,  an edgeedge with one O(12)La3Pt tetrahedra, edges with three equivalent O(5)La3Pt tetrahedra, and  an edgeedge with one O(10)La2Pt2 trigonal pyramid. In the third O site, O(3) is bonded in a 4-coordinate geometry to one La(1), one La(2), one Pt(1), and one Pt(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one Pt(2), and one Pt(4) atom. In the fifth O site, O(5) is bonded to one La(4), two equivalent La(2), and one Pt(1) atom to form OLa3Pt tetrahedra that share  a cornercorner with one O(1)La2Pt2 tetrahedra, corners with two equivalent O(5)La3Pt tetrahedra, corners with four equivalent O(12)La3Pt tetrahedra, corners with two equivalent O(10)La2Pt2 trigonal pyramids, and edges with three equivalent O(2)La3Pt tetrahedra. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one La(3), two equivalent La(1), and two equivalent Pt(2) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Pt(1), and one Pt(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one La(2), one La(4), and one Pt(3) atom. In the ninth O site, O(9) is bonded to one La(1), one La(3), one Pt(3), and one Pt(4) atom to form OLa2Pt2 tetrahedra that share  a cornercorner with one O(11)La2Pt2 tetrahedra,  a cornercorner with one O(12)La3Pt tetrahedra, corners with two equivalent O(1)La2Pt2 tetrahedra,  an edgeedge with one O(11)La2Pt2 tetrahedra, and  an edgeedge with one O(10)La2Pt2 trigonal pyramid. In the tenth O site, O(10) is bonded to one La(3), one La(4), one Pt(1), and one Pt(3) atom to form distorted OLa2Pt2 trigonal pyramids that share  a cornercorner with one O(11)La2Pt2 tetrahedra, corners with two equivalent O(5)La3Pt tetrahedra, corners with three equivalent O(12)La3Pt tetrahedra,  an edgeedge with one O(1)La2Pt2 tetrahedra,  an edgeedge with one O(9)La2Pt2 tetrahedra, and  an edgeedge with one O(2)La3Pt tetrahedra. In the eleventh O site, O(11) is bonded to one La(1), one La(3), one Pt(2), and one Pt(4) atom to form a mixture of distorted corner and edge-sharing OLa2Pt2 tetrahedra. In the twelfth O site, O(12) is bonded to one La(2), two equivalent La(4), and one Pt(3) atom to form OLa3Pt tetrahedra that share  a cornercorner with one O(9)La2Pt2 tetrahedra, corners with two equivalent O(12)La3Pt tetrahedra, corners with two equivalent O(2)La3Pt tetrahedra, corners with four equivalent O(5)La3Pt tetrahedra, corners with three equivalent O(10)La2Pt2 trigonal pyramids, and  an edgeedge with one O(2)La3Pt tetrahedra. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one La(3), two equivalent La(1), and two equivalent Pt(4) atoms. In the fourteenth O site, O(14) is bonded in a distorted see-saw-like geometry to one La(3), one La(4), one Pt(3), and one Pt(4) atom.
La2Pt2O7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(1), one O(11), one O(3), one O(4), one O(9), two equivalent O(13), and two equivalent O(6) atoms. The La(1)-O(1) bond length is 2.37 Å. The La(1)-O(11) bond length is 2.48 Å. The La(1)-O(3) bond length is 2.72 Å. The La(1)-O(4) bond length is 2.36 Å. The La(1)-O(9) bond length is 2.36 Å. There is one shorter (2.77 Å) and one longer (2.84 Å) La(1)-O(13) bond length. There is one shorter (2.80 Å) and one longer (2.81 Å) La(1)-O(6) bond length. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(12), one O(3), one O(8), two equivalent O(2), and two equivalent O(5) atoms. The La(2)-O(12) bond length is 2.51 Å. The La(2)-O(3) bond length is 2.59 Å. The La(2)-O(8) bond length is 2.36 Å. There is one shorter (2.44 Å) and one longer (2.54 Å) La(2)-O(2) bond length. There is one shorter (2.43 Å) and one longer (2.51 Å) La(2)-O(5) bond length. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(14), one O(6), one O(7), and one O(9) atom. The La(3)-O(1) bond length is 2.58 Å. The La(3)-O(10) bond length is 2.52 Å. The La(3)-O(11) bond length is 2.49 Å. The La(3)-O(13) bond length is 2.40 Å. The La(3)-O(14) bond length is 2.57 Å. The La(3)-O(6) bond length is 2.41 Å. The La(3)-O(7) bond length is 2.56 Å. The La(3)-O(9) bond length is 2.55 Å. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(2), one O(5), one O(7), one O(8), and two equivalent O(12) atoms. The La(4)-O(10) bond length is 2.57 Å. The La(4)-O(14) bond length is 2.75 Å. The La(4)-O(2) bond length is 2.61 Å. The La(4)-O(5) bond length is 2.49 Å. The La(4)-O(7) bond length is 2.83 Å. The La(4)-O(8) bond length is 2.51 Å. There is one shorter (2.50 Å) and one longer (2.52 Å) La(4)-O(12) bond length. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(7) atom to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles range from 35-38°. The Pt(1)-O(1) bond length is 2.04 Å. The Pt(1)-O(10) bond length is 2.11 Å. The Pt(1)-O(2) bond length is 2.01 Å. The Pt(1)-O(3) bond length is 2.08 Å. The Pt(1)-O(5) bond length is 1.99 Å. The Pt(1)-O(7) bond length is 2.11 Å. In the second Pt site, Pt(2) is bonded to one O(1), one O(11), one O(4), one O(7), and two equivalent O(6) atoms to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles range from 29-38°. The Pt(2)-O(1) bond length is 2.02 Å. The Pt(2)-O(11) bond length is 2.07 Å. The Pt(2)-O(4) bond length is 2.06 Å. The Pt(2)-O(7) bond length is 2.07 Å. There is one shorter (2.10 Å) and one longer (2.13 Å) Pt(2)-O(6) bond length. In the third Pt site, Pt(3) is bonded to one O(10), one O(12), one O(14), one O(3), one O(8), and one O(9) atom to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles range from 35-39°. The Pt(3)-O(10) bond length is 2.11 Å. The Pt(3)-O(12) bond length is 2.02 Å. The Pt(3)-O(14) bond length is 2.13 Å. The Pt(3)-O(3) bond length is 2.08 Å. The Pt(3)-O(8) bond length is 1.98 Å. The Pt(3)-O(9) bond length is 2.05 Å. In the fourth Pt site, Pt(4) is bonded to one O(11), one O(14), one O(4), one O(9), and two equivalent O(13) atoms to form corner-sharing PtO6 octahedra. The corner-sharing octahedral tilt angles range from 29-39°. The Pt(4)-O(11) bond length is 2.07 Å. The Pt(4)-O(14) bond length is 2.08 Å. The Pt(4)-O(4) bond length is 2.07 Å. The Pt(4)-O(9) bond length is 2.03 Å. There is one shorter (2.11 Å) and one longer (2.14 Å) Pt(4)-O(13) bond length. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(3), one Pt(1), and one Pt(2) atom to form distorted OLa2Pt2 tetrahedra that share  a cornercorner with one O(11)La2Pt2 tetrahedra,  a cornercorner with one O(2)La3Pt tetrahedra,  a cornercorner with one O(5)La3Pt tetrahedra, corners with two equivalent O(9)La2Pt2 tetrahedra,  an edgeedge with one O(11)La2Pt2 tetrahedra, and  an edgeedge with one O(10)La2Pt2 trigonal pyramid. In the second O site, O(2) is bonded to one La(4), two equivalent La(2), and one Pt(1) atom to form OLa3Pt tetrahedra that share  a cornercorner with one O(1)La2Pt2 tetrahedra, corners with two equivalent O(12)La3Pt tetrahedra, corners with two equivalent O(2)La3Pt tetrahedra,  an edgeedge with one O(12)La3Pt tetrahedra, edges with three equivalent O(5)La3Pt tetrahedra, and  an edgeedge with one O(10)La2Pt2 trigonal pyramid. In the third O site, O(3) is bonded in a 4-coordinate geometry to one La(1), one La(2), one Pt(1), and one Pt(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one Pt(2), and one Pt(4) atom. In the fifth O site, O(5) is bonded to one La(4), two equivalent La(2), and one Pt(1) atom to form OLa3Pt tetrahedra that share  a cornercorner with one O(1)La2Pt2 tetrahedra, corners with two equivalent O(5)La3Pt tetrahedra, corners with four equivalent O(12)La3Pt tetrahedra, corners with two equivalent O(10)La2Pt2 trigonal pyramids, and edges with three equivalent O(2)La3Pt tetrahedra. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one La(3), two equivalent La(1), and two equivalent Pt(2) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Pt(1), and one Pt(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one La(2), one La(4), and one Pt(3) atom. In the ninth O site, O(9) is bonded to one La(1), one La(3), one Pt(3), and one Pt(4) atom to form OLa2Pt2 tetrahedra that share  a cornercorner with one O(11)La2Pt2 tetrahedra,  a cornercorner with one O(12)La3Pt tetrahedra, corners with two equivalent O(1)La2Pt2 tetrahedra,  an edgeedge with one O(11)La2Pt2 tetrahedra, and  an edgeedge with one O(10)La2Pt2 trigonal pyramid. In the tenth O site, O(10) is bonded to one La(3), one La(4), one Pt(1), and one Pt(3) atom to form distorted OLa2Pt2 trigonal pyramids that share  a cornercorner with one O(11)La2Pt2 tetrahedra, corners with two equivalent O(5)La3Pt tetrahedra, corners with three equivalent O(12)La3Pt tetrahedra,  an edgeedge with one O(1)La2Pt2 tetrahedra,  an edgeedge with one O(9)La2Pt2 tetrahedra, and  an edgeedge with one O(2)La3Pt tetrahedra. In the eleventh O site, O(11) is bonded to one La(1), one La(3), one Pt(2), and one Pt(4) atom to form a mixture of distorted corner and edge-sharing OLa2Pt2 tetrahedra. In the twelfth O site, O(12) is bonded to one La(2), two equivalent La(4), and one Pt(3) atom to form OLa3Pt tetrahedra that share  a cornercorner with one O(9)La2Pt2 tetrahedra, corners with two equivalent O(12)La3Pt tetrahedra, corners with two equivalent O(2)La3Pt tetrahedra, corners with four equivalent O(5)La3Pt tetrahedra, corners with three equivalent O(10)La2Pt2 trigonal pyramids, and  an edgeedge with one O(2)La3Pt tetrahedra. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one La(3), two equivalent La(1), and two equivalent Pt(4) atoms. In the fourteenth O site, O(14) is bonded in a distorted see-saw-like geometry to one La(3), one La(4), one Pt(3), and one Pt(4) atom.