(Na(BO4)2)4O2 crystallizes in the monoclinic C2/c space group. The structure consists of four water atoms inside a Na(BO4)2 framework. In the Na(BO4)2 framework, Na(1) is bonded in a 5-coordinate geometry to one O(5), one O(7), one O(8), and two equivalent O(2) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(4) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(4) atom. There are nine inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent B(1) atoms. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one B(1) and one B(2) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Na(1), one O(5), and one O(9) atom. In the fourth O site, O(6) is bonded in a single-bond geometry to one O(7) atom. In the fifth O site, O(7) is bonded in a bent 120 degrees geometry to one Na(1) and one O(6) atom. In the sixth O site, O(8) is bonded in a bent 120 degrees geometry to one Na(1) and one O(8) atom. In the seventh O site, O(9) is bonded in a 2-coordinate geometry to two equivalent O(5) atoms. In the eighth O site, O(1) is bonded in a bent 150 degrees geometry to one B(1) and one B(2) atom. In the ninth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one B(2) atom.
(Na(BO4)2)4O2 crystallizes in the monoclinic C2/c space group. The structure consists of four water atoms inside a Na(BO4)2 framework. In the Na(BO4)2 framework, Na(1) is bonded in a 5-coordinate geometry to one O(5), one O(7), one O(8), and two equivalent O(2) atoms. The Na(1)-O(5) bond length is 2.45 Å. The Na(1)-O(7) bond length is 2.70 Å. The Na(1)-O(8) bond length is 2.75 Å. There is one shorter (2.23 Å) and one longer (2.25 Å) Na(1)-O(2) bond length. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(4) atom. The B(1)-O(1) bond length is 1.36 Å. The B(1)-O(3) bond length is 1.37 Å. The B(1)-O(4) bond length is 1.37 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(4) atom. The B(2)-O(1) bond length is 1.41 Å. The B(2)-O(2) bond length is 1.32 Å. The B(2)-O(4) bond length is 1.42 Å. There are nine inequivalent O sites. In the first O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent B(1) atoms. In the second O site, O(4) is bonded in a bent 150 degrees geometry to one B(1) and one B(2) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to one Na(1), one O(5), and one O(9) atom. The O(5)-O(5) bond length is 1.47 Å. The O(5)-O(9) bond length is 1.47 Å. In the fourth O site, O(6) is bonded in a single-bond geometry to one O(7) atom. The O(6)-O(7) bond length is 1.24 Å. In the fifth O site, O(7) is bonded in a bent 120 degrees geometry to one Na(1) and one O(6) atom. In the sixth O site, O(8) is bonded in a bent 120 degrees geometry to one Na(1) and one O(8) atom. The O(8)-O(8) bond length is 1.24 Å. In the seventh O site, O(9) is bonded in a 2-coordinate geometry to two equivalent O(5) atoms. In the eighth O site, O(1) is bonded in a bent 150 degrees geometry to one B(1) and one B(2) atom. In the ninth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one B(2) atom.