Sm2PtNiO6 crystallizes in the monoclinic P2_1/c space group. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. Pt(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form PtO6 octahedra that share corners with six equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-37°. Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with six equivalent Pt(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-37°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1), one Pt(1), and one Ni(1) atom to form distorted corner-sharing OSm2NiPt trigonal pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Sm(1), one Pt(1), and one Ni(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Sm(1), one Pt(1), and one Ni(1) atom.
Sm2PtNiO6 crystallizes in the monoclinic P2_1/c space group. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(1), three equivalent O(2), and three equivalent O(3) atoms. There is one shorter (2.31 Å) and one longer (2.37 Å) Sm(1)-O(1) bond length. There are a spread of Sm(1)-O(2) bond distances ranging from 2.36-2.77 Å. There are a spread of Sm(1)-O(3) bond distances ranging from 2.35-2.73 Å. Pt(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form PtO6 octahedra that share corners with six equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-37°. Both Pt(1)-O(1) bond lengths are 2.05 Å. Both Pt(1)-O(2) bond lengths are 2.06 Å. Both Pt(1)-O(3) bond lengths are 2.06 Å. Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form NiO6 octahedra that share corners with six equivalent Pt(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-37°. Both Ni(1)-O(1) bond lengths are 2.06 Å. Both Ni(1)-O(2) bond lengths are 2.10 Å. Both Ni(1)-O(3) bond lengths are 2.09 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sm(1), one Pt(1), and one Ni(1) atom to form distorted corner-sharing OSm2NiPt trigonal pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Sm(1), one Pt(1), and one Ni(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Sm(1), one Pt(1), and one Ni(1) atom.