K2Cu(CO3)2 crystallizes in the triclinic P1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(4), one O(6), one O(9), and two equivalent O(5) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(3), one O(5), and two equivalent O(6) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(2), one O(3), one O(8), one O(9), and two equivalent O(7) atoms. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(4), one O(7), one O(9), and two equivalent O(8) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(7), and one O(8) atom. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(3), one O(4), one O(5), and one O(6) atom. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(9) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(10), one O(2), and one O(6) atom. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(11), one O(3), and one O(7) atom. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(12), one O(4), and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one K(1), one K(4), one Cu(1), and one C(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(2), one K(3), one Cu(1), and one C(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(2), one K(3), one Cu(2), and one C(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(4), one Cu(2), and one C(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(2), two equivalent K(1), one Cu(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), two equivalent K(2), one Cu(2), and one C(2) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one K(4), two equivalent K(3), one Cu(1), and one C(3) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one K(3), two equivalent K(4), one Cu(1), and one C(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(1), one K(3), one K(4), and one C(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(2), one K(3), one K(4), and one C(2) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one C(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(4), and one C(4) atom.
K2Cu(CO3)2 crystallizes in the triclinic P1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(4), one O(6), one O(9), and two equivalent O(5) atoms. The K(1)-O(1) bond length is 2.73 Å. The K(1)-O(11) bond length is 2.78 Å. The K(1)-O(12) bond length is 2.81 Å. The K(1)-O(4) bond length is 3.00 Å. The K(1)-O(6) bond length is 2.75 Å. The K(1)-O(9) bond length is 2.85 Å. There is one shorter (3.11 Å) and one longer (3.16 Å) K(1)-O(5) bond length. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(3), one O(5), and two equivalent O(6) atoms. The K(2)-O(10) bond length is 2.80 Å. The K(2)-O(11) bond length is 2.76 Å. The K(2)-O(12) bond length is 2.86 Å. The K(2)-O(2) bond length is 2.70 Å. The K(2)-O(3) bond length is 3.06 Å. The K(2)-O(5) bond length is 2.78 Å. There is one shorter (2.97 Å) and one longer (3.29 Å) K(2)-O(6) bond length. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(2), one O(3), one O(8), one O(9), and two equivalent O(7) atoms. The K(3)-O(10) bond length is 2.84 Å. The K(3)-O(11) bond length is 2.89 Å. The K(3)-O(2) bond length is 3.01 Å. The K(3)-O(3) bond length is 2.82 Å. The K(3)-O(8) bond length is 2.73 Å. The K(3)-O(9) bond length is 2.79 Å. There is one shorter (3.05 Å) and one longer (3.22 Å) K(3)-O(7) bond length. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(4), one O(7), one O(9), and two equivalent O(8) atoms. The K(4)-O(1) bond length is 3.01 Å. The K(4)-O(10) bond length is 2.83 Å. The K(4)-O(12) bond length is 2.76 Å. The K(4)-O(4) bond length is 2.74 Å. The K(4)-O(7) bond length is 2.78 Å. The K(4)-O(9) bond length is 2.82 Å. There is one shorter (3.09 Å) and one longer (3.19 Å) K(4)-O(8) bond length. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(7), and one O(8) atom. The Cu(1)-O(1) bond length is 1.89 Å. The Cu(1)-O(2) bond length is 2.00 Å. The Cu(1)-O(7) bond length is 2.00 Å. The Cu(1)-O(8) bond length is 1.95 Å. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(3), one O(4), one O(5), and one O(6) atom. The Cu(2)-O(3) bond length is 1.95 Å. The Cu(2)-O(4) bond length is 1.96 Å. The Cu(2)-O(5) bond length is 1.93 Å. The Cu(2)-O(6) bond length is 1.98 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(9) atom. The C(1)-O(1) bond length is 1.40 Å. The C(1)-O(5) bond length is 1.32 Å. The C(1)-O(9) bond length is 1.30 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(10), one O(2), and one O(6) atom. The C(2)-O(10) bond length is 1.27 Å. The C(2)-O(2) bond length is 1.40 Å. The C(2)-O(6) bond length is 1.34 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one O(11), one O(3), and one O(7) atom. The C(3)-O(11) bond length is 1.24 Å. The C(3)-O(3) bond length is 1.29 Å. The C(3)-O(7) bond length is 1.31 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one O(12), one O(4), and one O(8) atom. The C(4)-O(12) bond length is 1.27 Å. The C(4)-O(4) bond length is 1.29 Å. The C(4)-O(8) bond length is 1.38 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one K(1), one K(4), one Cu(1), and one C(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(2), one K(3), one Cu(1), and one C(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(2), one K(3), one Cu(2), and one C(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(4), one Cu(2), and one C(4) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(2), two equivalent K(1), one Cu(2), and one C(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), two equivalent K(2), one Cu(2), and one C(2) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one K(4), two equivalent K(3), one Cu(1), and one C(3) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one K(3), two equivalent K(4), one Cu(1), and one C(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(1), one K(3), one K(4), and one C(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(2), one K(3), one K(4), and one C(2) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), and one C(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(4), and one C(4) atom.