KPbO2 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), one O(5), and one O(6) atom. In the second K site, K(2) is bonded in a 2-coordinate geometry to one O(2), one O(3), one O(6), and one O(7) atom. In the third K site, K(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), one O(5), and one O(6) atom. In the fourth K site, K(4) is bonded in a 2-coordinate geometry to one O(1), one O(4), one O(5), and one O(8) atom. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted T-shaped geometry to one O(4), one O(5), and one O(8) atom. In the second Pb site, Pb(2) is bonded in a distorted T-shaped geometry to one O(2), one O(3), and one O(6) atom. In the third Pb site, Pb(3) is bonded in a 2-coordinate geometry to one O(1), one O(3), one O(6), one O(7), and one O(8) atom. In the fourth Pb site, Pb(4) is bonded in a 2-coordinate geometry to one O(1), one O(3), one O(5), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(4), one Pb(3), and one Pb(4) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one Pb(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(2), one Pb(2), one Pb(3), and one Pb(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(3), one K(4), and one Pb(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one K(1), one K(3), one K(4), one Pb(1), and one Pb(4) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one K(1), one K(2), one K(3), one Pb(2), and one Pb(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(2), one Pb(3), and one Pb(4) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(4), one Pb(1), one Pb(3), and one Pb(4) atom.
KPbO2 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), one O(5), and one O(6) atom. The K(1)-O(2) bond length is 2.18 Å. The K(1)-O(4) bond length is 2.78 Å. The K(1)-O(5) bond length is 2.16 Å. The K(1)-O(6) bond length is 2.67 Å. In the second K site, K(2) is bonded in a 2-coordinate geometry to one O(2), one O(3), one O(6), and one O(7) atom. The K(2)-O(2) bond length is 2.30 Å. The K(2)-O(3) bond length is 2.92 Å. The K(2)-O(6) bond length is 3.10 Å. The K(2)-O(7) bond length is 2.19 Å. In the third K site, K(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), one O(5), and one O(6) atom. The K(3)-O(2) bond length is 2.78 Å. The K(3)-O(4) bond length is 2.17 Å. The K(3)-O(5) bond length is 2.67 Å. The K(3)-O(6) bond length is 2.17 Å. In the fourth K site, K(4) is bonded in a 2-coordinate geometry to one O(1), one O(4), one O(5), and one O(8) atom. The K(4)-O(1) bond length is 2.18 Å. The K(4)-O(4) bond length is 2.30 Å. The K(4)-O(5) bond length is 3.11 Å. The K(4)-O(8) bond length is 2.94 Å. There are four inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a distorted T-shaped geometry to one O(4), one O(5), and one O(8) atom. The Pb(1)-O(4) bond length is 2.45 Å. The Pb(1)-O(5) bond length is 1.86 Å. The Pb(1)-O(8) bond length is 2.52 Å. In the second Pb site, Pb(2) is bonded in a distorted T-shaped geometry to one O(2), one O(3), and one O(6) atom. The Pb(2)-O(2) bond length is 2.45 Å. The Pb(2)-O(3) bond length is 2.52 Å. The Pb(2)-O(6) bond length is 1.86 Å. In the third Pb site, Pb(3) is bonded in a 2-coordinate geometry to one O(1), one O(3), one O(6), one O(7), and one O(8) atom. The Pb(3)-O(1) bond length is 1.83 Å. The Pb(3)-O(3) bond length is 1.98 Å. The Pb(3)-O(6) bond length is 2.79 Å. The Pb(3)-O(7) bond length is 2.35 Å. The Pb(3)-O(8) bond length is 2.62 Å. In the fourth Pb site, Pb(4) is bonded in a 2-coordinate geometry to one O(1), one O(3), one O(5), one O(7), and one O(8) atom. The Pb(4)-O(1) bond length is 2.36 Å. The Pb(4)-O(3) bond length is 2.61 Å. The Pb(4)-O(5) bond length is 2.79 Å. The Pb(4)-O(7) bond length is 1.83 Å. The Pb(4)-O(8) bond length is 1.98 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(4), one Pb(3), and one Pb(4) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one Pb(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(2), one Pb(2), one Pb(3), and one Pb(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(3), one K(4), and one Pb(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one K(1), one K(3), one K(4), one Pb(1), and one Pb(4) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one K(1), one K(2), one K(3), one Pb(2), and one Pb(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(2), one Pb(3), and one Pb(4) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(4), one Pb(1), one Pb(3), and one Pb(4) atom.