NpB3O8 crystallizes in the orthorhombic Pca2_1 space group. Np(1) is bonded in a 7-coordinate geometry to one O(6), one O(7), one O(8), two equivalent O(2), and two equivalent O(5) atoms. There are three 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(7), and one O(8) atom. In the third B site, B(3) is bonded in a tetrahedral geometry to one O(3), one O(4), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Np(1) atoms. In the second O site, O(6) is bonded in a bent 120 degrees geometry to one Np(1) and one B(3) atom. In the third O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Np(1) and one B(2) atom. In the fourth O site, O(8) is bonded in a bent 120 degrees geometry to one Np(1), one B(2), and one B(3) atom. In the fifth O site, O(1) is bonded in a bent 120 degrees geometry to one B(1) and one B(2) atom. In the sixth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Np(1) atoms. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one B(1) and one B(3) atom. In the eighth O site, O(4) is bonded in a bent 120 degrees geometry to one B(1) and one B(3) atom.
NpB3O8 crystallizes in the orthorhombic Pca2_1 space group. Np(1) is bonded in a 7-coordinate geometry to one O(6), one O(7), one O(8), two equivalent O(2), and two equivalent O(5) atoms. The Np(1)-O(6) bond length is 1.97 Å. The Np(1)-O(7) bond length is 2.06 Å. The Np(1)-O(8) bond length is 2.54 Å. There is one shorter (1.83 Å) and one longer (2.71 Å) Np(1)-O(2) bond length. There is one shorter (1.86 Å) and one longer (2.42 Å) Np(1)-O(5) bond length. There are three 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 1.41 Å. The B(1)-O(3) bond length is 1.38 Å. The B(1)-O(4) bond length is 1.36 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(7), and one O(8) atom. The B(2)-O(1) bond length is 1.36 Å. The B(2)-O(7) bond length is 1.40 Å. The B(2)-O(8) bond length is 1.39 Å. In the third B site, B(3) is bonded in a tetrahedral geometry to one O(3), one O(4), one O(6), and one O(8) atom. The B(3)-O(3) bond length is 1.43 Å. The B(3)-O(4) bond length is 1.42 Å. The B(3)-O(6) bond length is 1.55 Å. The B(3)-O(8) bond length is 1.52 Å. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent Np(1) atoms. In the second O site, O(6) is bonded in a bent 120 degrees geometry to one Np(1) and one B(3) atom. In the third O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Np(1) and one B(2) atom. In the fourth O site, O(8) is bonded in a bent 120 degrees geometry to one Np(1), one B(2), and one B(3) atom. In the fifth O site, O(1) is bonded in a bent 120 degrees geometry to one B(1) and one B(2) atom. In the sixth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Np(1) atoms. In the seventh O site, O(3) is bonded in a bent 120 degrees geometry to one B(1) and one B(3) atom. In the eighth O site, O(4) is bonded in a bent 120 degrees geometry to one B(1) and one B(3) atom.