Na2Sn(CO2)4 crystallizes in the monoclinic C2/c space group. Na(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted edge-sharing NaO6 pentagonal pyramids. Sn(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(1), one Sn(1), and one C(2) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one Na(1), one Sn(1), and one C(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Na(1) and one C(1) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one C(2) atom.
Na2Sn(CO2)4 crystallizes in the monoclinic C2/c space group. Na(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted edge-sharing NaO6 pentagonal pyramids. The Na(1)-O(1) bond length is 2.61 Å. The Na(1)-O(4) bond length is 2.43 Å. There is one shorter (2.41 Å) and one longer (2.49 Å) Na(1)-O(2) bond length. There is one shorter (2.41 Å) and one longer (2.48 Å) Na(1)-O(3) bond length. Sn(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(4) atoms. Both Sn(1)-O(1) bond lengths are 2.40 Å. Both Sn(1)-O(4) bond lengths are 2.29 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(2)-O(3) bond length is 1.25 Å. The C(2)-O(4) bond length is 1.29 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one Na(1), one Sn(1), and one C(2) atom. In the second O site, O(1) is bonded in a distorted single-bond geometry to one Na(1), one Sn(1), and one C(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Na(1) and one C(1) atom. In the fourth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one C(2) atom.