MgPb5 crystallizes in the trigonal R32 space group. Mg(1) is bonded to six Pb(1,1,1) and six equivalent Pb(2) atoms to form MgPb12 cuboctahedra that share corners with six equivalent Mg(1)Pb12 cuboctahedra; edges with six equivalent Mg(1)Pb12 cuboctahedra; edges with twelve Pb(1,1,1)Mg2Pb10 cuboctahedra; and faces with twelve Pb(1,1,1)Mg2Pb10 cuboctahedra. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to two equivalent Mg(1); four equivalent Pb(2); and six Pb(1,1) atoms to form distorted PbMg2Pb10 cuboctahedra that share corners with eighteen Pb(1,1)Mg2Pb10 cuboctahedra; edges with four equivalent Mg(1)Pb12 cuboctahedra; edges with six equivalent Pb(1)Mg2Pb10 cuboctahedra; faces with four equivalent Mg(1)Pb12 cuboctahedra; and faces with eight Pb(1,1)Mg2Pb10 cuboctahedra. In the second Pb site, Pb(1) is bonded to two equivalent Mg(1); four equivalent Pb(2); and six Pb(1,1) atoms to form distorted PbMg2Pb10 cuboctahedra that share corners with eighteen Pb(1,1,1)Mg2Pb10 cuboctahedra; edges with four equivalent Mg(1)Pb12 cuboctahedra; edges with six equivalent Pb(1)Mg2Pb10 cuboctahedra; faces with four equivalent Mg(1)Pb12 cuboctahedra; and faces with eight Pb(1,1,1)Mg2Pb10 cuboctahedra. In the third Pb site, Pb(1) is bonded to two equivalent Mg(1); four equivalent Pb(2); and six Pb(1,1) atoms to form distorted PbMg2Pb10 cuboctahedra that share corners with eighteen Pb(1,1,1)Mg2Pb10 cuboctahedra; edges with four equivalent Mg(1)Pb12 cuboctahedra; edges with six equivalent Pb(1)Mg2Pb10 cuboctahedra; faces with four equivalent Mg(1)Pb12 cuboctahedra; and faces with eight Pb(1,1)Mg2Pb10 cuboctahedra. In the fourth Pb site, Pb(2) is bonded in a distorted trigonal planar geometry to three equivalent Mg(1) and six Pb(1,1,1) atoms.
MgPb5 crystallizes in the trigonal R32 space group. Mg(1) is bonded to six Pb(1,1,1) and six equivalent Pb(2) atoms to form MgPb12 cuboctahedra that share corners with six equivalent Mg(1)Pb12 cuboctahedra; edges with six equivalent Mg(1)Pb12 cuboctahedra; edges with twelve Pb(1,1,1)Mg2Pb10 cuboctahedra; and faces with twelve Pb(1,1,1)Mg2Pb10 cuboctahedra. All Mg(1)-Pb(1,1,1) bond lengths are 3.51 Å. All Mg(1)-Pb(2) bond lengths are 3.42 Å. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded to two equivalent Mg(1); four equivalent Pb(2); and six Pb(1,1) atoms to form distorted PbMg2Pb10 cuboctahedra that share corners with eighteen Pb(1,1)Mg2Pb10 cuboctahedra; edges with four equivalent Mg(1)Pb12 cuboctahedra; edges with six equivalent Pb(1)Mg2Pb10 cuboctahedra; faces with four equivalent Mg(1)Pb12 cuboctahedra; and faces with eight Pb(1,1)Mg2Pb10 cuboctahedra. There are two shorter (3.51 Å) and two longer (3.53 Å) Pb(1)-Pb(2) bond lengths. There are four shorter (3.41 Å) and two longer (3.45 Å) Pb(1)-Pb(1,1) bond lengths. In the second Pb site, Pb(1) is bonded to two equivalent Mg(1); four equivalent Pb(2); and six Pb(1,1) atoms to form distorted PbMg2Pb10 cuboctahedra that share corners with eighteen Pb(1,1,1)Mg2Pb10 cuboctahedra; edges with four equivalent Mg(1)Pb12 cuboctahedra; edges with six equivalent Pb(1)Mg2Pb10 cuboctahedra; faces with four equivalent Mg(1)Pb12 cuboctahedra; and faces with eight Pb(1,1,1)Mg2Pb10 cuboctahedra. There are two shorter (3.51 Å) and two longer (3.53 Å) Pb(1)-Pb(2) bond lengths. There are two shorter (3.41 Å) and one longer (3.45 Å) Pb(1)-Pb(1) bond length. In the third Pb site, Pb(1) is bonded to two equivalent Mg(1); four equivalent Pb(2); and six Pb(1,1) atoms to form distorted PbMg2Pb10 cuboctahedra that share corners with eighteen Pb(1,1,1)Mg2Pb10 cuboctahedra; edges with four equivalent Mg(1)Pb12 cuboctahedra; edges with six equivalent Pb(1)Mg2Pb10 cuboctahedra; faces with four equivalent Mg(1)Pb12 cuboctahedra; and faces with eight Pb(1,1)Mg2Pb10 cuboctahedra. There are two shorter (3.51 Å) and two longer (3.53 Å) Pb(1)-Pb(2) bond lengths. In the fourth Pb site, Pb(2) is bonded in a distorted trigonal planar geometry to three equivalent Mg(1) and six Pb(1,1,1) atoms.