Na2NpH2(CO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(8), and two equivalent O(5) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(6), one O(9), and two equivalent O(7) atoms. Np(1) is bonded to one O(2), one O(4), one O(6), one O(7), one O(8), and two equivalent O(1) atoms to form distorted edge-sharing NpO7 pentagonal bipyramids. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(7) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(3) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(8) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Np(1) and one C(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one Np(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one Np(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(2), one Np(1), and one C(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Na(2), one Np(1), and one C(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Na(1), one Np(1), and one C(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Na(2), one H(1), and one H(2) atom.
Na2NpH2(CO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(8), and two equivalent O(5) atoms. The Na(1)-O(2) bond length is 2.43 Å. The Na(1)-O(3) bond length is 2.40 Å. The Na(1)-O(4) bond length is 2.41 Å. The Na(1)-O(8) bond length is 2.92 Å. There is one shorter (2.36 Å) and one longer (2.38 Å) Na(1)-O(5) bond length. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), one O(6), one O(9), and two equivalent O(7) atoms. The Na(2)-O(2) bond length is 2.60 Å. The Na(2)-O(4) bond length is 2.40 Å. The Na(2)-O(6) bond length is 2.49 Å. The Na(2)-O(9) bond length is 2.28 Å. There is one shorter (2.39 Å) and one longer (2.88 Å) Na(2)-O(7) bond length. Np(1) is bonded to one O(2), one O(4), one O(6), one O(7), one O(8), and two equivalent O(1) atoms to form distorted edge-sharing NpO7 pentagonal bipyramids. The Np(1)-O(2) bond length is 1.87 Å. The Np(1)-O(4) bond length is 1.85 Å. The Np(1)-O(6) bond length is 2.54 Å. The Np(1)-O(7) bond length is 2.45 Å. The Np(1)-O(8) bond length is 2.49 Å. There is one shorter (2.50 Å) and one longer (2.54 Å) Np(1)-O(1) bond length. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(7) atom. The C(1)-O(5) bond length is 1.25 Å. The C(1)-O(7) bond length is 1.29 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(3) atom. The C(2)-O(1) bond length is 1.30 Å. The C(2)-O(3) bond length is 1.24 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(8) atom. The C(3)-O(6) bond length is 1.27 Å. The C(3)-O(8) bond length is 1.27 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. The H(1)-O(9) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. The H(2)-O(9) bond length is 0.98 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Np(1) and one C(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one Np(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one Np(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(2), one Np(1), and one C(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Na(2), one Np(1), and one C(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Na(1), one Np(1), and one C(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Na(2), one H(1), and one H(2) atom.