NpF4 crystallizes in the triclinic P-1 space group. There are three inequivalent Np sites. In the first Np site, Np(1) is bonded in a 8-coordinate geometry to one F(10), one F(11), one F(12), one F(13), one F(4), one F(5), one F(6), and one F(7) atom. In the second Np site, Np(2) is bonded in a 8-coordinate geometry to one F(1), one F(10), one F(13), one F(3), one F(5), one F(6), one F(8), and one F(9) atom. In the third Np site, Np(3) is bonded in a 8-coordinate geometry to one F(11), one F(12), one F(2), one F(3), one F(4), one F(7), one F(8), and one F(9) atom. There are thirteen inequivalent F sites. In the first F site, F(1) is bonded in a linear geometry to two equivalent Np(2) atoms. In the second F site, F(2) is bonded in a linear geometry to two equivalent Np(3) atoms. In the third F site, F(3) is bonded in a linear geometry to one Np(2) and one Np(3) atom. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(3) atom. In the fifth F site, F(5) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(2) atom. In the sixth F site, F(6) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(2) atom. In the seventh F site, F(7) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(3) atom. In the eighth F site, F(8) is bonded in a bent 150 degrees geometry to one Np(2) and one Np(3) atom. In the ninth F site, F(9) is bonded in a bent 150 degrees geometry to one Np(2) and one Np(3) atom. In the tenth F site, F(10) is bonded in a linear geometry to one Np(1) and one Np(2) atom. In the eleventh F site, F(11) is bonded in a linear geometry to one Np(1) and one Np(3) atom. In the twelfth F site, F(12) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(3) atom. In the thirteenth F site, F(13) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(2) atom.
NpF4 crystallizes in the triclinic P-1 space group. There are three inequivalent Np sites. In the first Np site, Np(1) is bonded in a 8-coordinate geometry to one F(10), one F(11), one F(12), one F(13), one F(4), one F(5), one F(6), and one F(7) atom. The Np(1)-F(10) bond length is 2.24 Å. The Np(1)-F(11) bond length is 2.23 Å. The Np(1)-F(12) bond length is 2.27 Å. The Np(1)-F(13) bond length is 2.26 Å. The Np(1)-F(4) bond length is 2.31 Å. The Np(1)-F(5) bond length is 2.33 Å. The Np(1)-F(6) bond length is 2.25 Å. The Np(1)-F(7) bond length is 2.26 Å. In the second Np site, Np(2) is bonded in a 8-coordinate geometry to one F(1), one F(10), one F(13), one F(3), one F(5), one F(6), one F(8), and one F(9) atom. The Np(2)-F(1) bond length is 2.24 Å. The Np(2)-F(10) bond length is 2.27 Å. The Np(2)-F(13) bond length is 2.26 Å. The Np(2)-F(3) bond length is 2.30 Å. The Np(2)-F(5) bond length is 2.25 Å. The Np(2)-F(6) bond length is 2.29 Å. The Np(2)-F(8) bond length is 2.28 Å. The Np(2)-F(9) bond length is 2.22 Å. In the third Np site, Np(3) is bonded in a 8-coordinate geometry to one F(11), one F(12), one F(2), one F(3), one F(4), one F(7), one F(8), and one F(9) atom. The Np(3)-F(11) bond length is 2.28 Å. The Np(3)-F(12) bond length is 2.25 Å. The Np(3)-F(2) bond length is 2.24 Å. The Np(3)-F(3) bond length is 2.29 Å. The Np(3)-F(4) bond length is 2.26 Å. The Np(3)-F(7) bond length is 2.29 Å. The Np(3)-F(8) bond length is 2.22 Å. The Np(3)-F(9) bond length is 2.28 Å. There are thirteen inequivalent F sites. In the first F site, F(1) is bonded in a linear geometry to two equivalent Np(2) atoms. In the second F site, F(2) is bonded in a linear geometry to two equivalent Np(3) atoms. In the third F site, F(3) is bonded in a linear geometry to one Np(2) and one Np(3) atom. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(3) atom. In the fifth F site, F(5) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(2) atom. In the sixth F site, F(6) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(2) atom. In the seventh F site, F(7) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(3) atom. In the eighth F site, F(8) is bonded in a bent 150 degrees geometry to one Np(2) and one Np(3) atom. In the ninth F site, F(9) is bonded in a bent 150 degrees geometry to one Np(2) and one Np(3) atom. In the tenth F site, F(10) is bonded in a linear geometry to one Np(1) and one Np(2) atom. In the eleventh F site, F(11) is bonded in a linear geometry to one Np(1) and one Np(3) atom. In the twelfth F site, F(12) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(3) atom. In the thirteenth F site, F(13) is bonded in a bent 150 degrees geometry to one Np(1) and one Np(2) atom.