MgCuPb2H4(O2Cl)2 crystallizes in the orthorhombic Pmm2 space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one Pb(2) and four equivalent O(1) atoms. Cu(1) is bonded in a 5-coordinate geometry to four equivalent O(1) and one Cl(1) atom. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. In the second Pb site, Pb(2) is bonded to one Mg(1), two equivalent Cl(1), and two equivalent Cl(2) atoms to form distorted corner-sharing PbMgCl4 square pyramids. H(1) is bonded in a single-bond geometry to one O(1) atom. O(1) is bonded in a distorted single-bond geometry to one Mg(1), one Cu(1), one Pb(1), and one H(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a distorted T-shaped geometry to one Cu(1) and two equivalent Pb(2) atoms. In the second Cl site, Cl(2) is bonded in a linear geometry to two equivalent Pb(2) atoms.
MgCuPb2H4(O2Cl)2 crystallizes in the orthorhombic Pmm2 space group. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one Pb(2) and four equivalent O(1) atoms. The Mg(1)-Pb(2) bond length is 3.24 Å. All Mg(1)-O(1) bond lengths are 2.06 Å. Cu(1) is bonded in a 5-coordinate geometry to four equivalent O(1) and one Cl(1) atom. All Cu(1)-O(1) bond lengths are 2.23 Å. The Cu(1)-Cl(1) bond length is 2.29 Å. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. All Pb(1)-O(1) bond lengths are 2.44 Å. In the second Pb site, Pb(2) is bonded to one Mg(1), two equivalent Cl(1), and two equivalent Cl(2) atoms to form distorted corner-sharing PbMgCl4 square pyramids. Both Pb(2)-Cl(1) bond lengths are 2.92 Å. Both Pb(2)-Cl(2) bond lengths are 2.97 Å. H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.98 Å. O(1) is bonded in a distorted single-bond geometry to one Mg(1), one Cu(1), one Pb(1), and one H(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a distorted T-shaped geometry to one Cu(1) and two equivalent Pb(2) atoms. In the second Cl site, Cl(2) is bonded in a linear geometry to two equivalent Pb(2) atoms.