PtCl3 crystallizes in the trigonal R-3 space group. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one Cl(1), one Cl(2), two equivalent Cl(5), and two equivalent Cl(6) atoms to form PtCl6 octahedra that share  a cornercorner with one Pt(2)Cl5 square pyramid and edges with two equivalent Pt(1)Cl6 octahedra. In the second Pt site, Pt(2) is bonded to one Cl(1), two equivalent Cl(3), and two equivalent Cl(4) atoms to form PtCl5 square pyramids that share  a cornercorner with one Pt(1)Cl6 octahedra and corners with four equivalent Pt(2)Cl5 square pyramids. The corner-sharing octahedral tilt angles are 4°. There are six inequivalent Cl sites. In the first Cl site, Cl(6) is bonded in an L-shaped geometry to two equivalent Pt(1) atoms. In the second Cl site, Cl(1) is bonded in a linear geometry to one Pt(1) and one Pt(2) atom. In the third Cl site, Cl(2) is bonded in a single-bond geometry to one Pt(1) atom. In the fourth Cl site, Cl(3) is bonded in an L-shaped geometry to two equivalent Pt(2) atoms. In the fifth Cl site, Cl(4) is bonded in an L-shaped geometry to two equivalent Pt(2) atoms. In the sixth Cl site, Cl(5) is bonded in an L-shaped geometry to two equivalent Pt(1) atoms.
PtCl3 crystallizes in the trigonal R-3 space group. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one Cl(1), one Cl(2), two equivalent Cl(5), and two equivalent Cl(6) atoms to form PtCl6 octahedra that share  a cornercorner with one Pt(2)Cl5 square pyramid and edges with two equivalent Pt(1)Cl6 octahedra. The Pt(1)-Cl(1) bond length is 2.34 Å. The Pt(1)-Cl(2) bond length is 2.29 Å. Both Pt(1)-Cl(5) bond lengths are 2.34 Å. There is one shorter (2.38 Å) and one longer (2.45 Å) Pt(1)-Cl(6) bond length. In the second Pt site, Pt(2) is bonded to one Cl(1), two equivalent Cl(3), and two equivalent Cl(4) atoms to form PtCl5 square pyramids that share  a cornercorner with one Pt(1)Cl6 octahedra and corners with four equivalent Pt(2)Cl5 square pyramids. The corner-sharing octahedral tilt angles are 4°. The Pt(2)-Cl(1) bond length is 2.81 Å. Both Pt(2)-Cl(3) bond lengths are 2.32 Å. Both Pt(2)-Cl(4) bond lengths are 2.32 Å. There are six inequivalent Cl sites. In the first Cl site, Cl(6) is bonded in an L-shaped geometry to two equivalent Pt(1) atoms. In the second Cl site, Cl(1) is bonded in a linear geometry to one Pt(1) and one Pt(2) atom. In the third Cl site, Cl(2) is bonded in a single-bond geometry to one Pt(1) atom. In the fourth Cl site, Cl(3) is bonded in an L-shaped geometry to two equivalent Pt(2) atoms. In the fifth Cl site, Cl(4) is bonded in an L-shaped geometry to two equivalent Pt(2) atoms. In the sixth Cl site, Cl(5) is bonded in an L-shaped geometry to two equivalent Pt(1) atoms.