UF3 crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to one F(2), one F(3), one F(6), two equivalent F(4), two equivalent F(5), and three equivalent F(1) atoms. In the second U site, U(2) is bonded in a 10-coordinate geometry to one F(3), one F(6), two equivalent F(1), two equivalent F(2), two equivalent F(4), and two equivalent F(5) atoms. There are six inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to one U(2) and three equivalent U(1) atoms. In the second F site, F(2) is bonded in a 4-coordinate geometry to two equivalent U(1) and two equivalent U(2) atoms. In the third F site, F(3) is bonded in a trigonal non-coplanar geometry to one U(2) and two equivalent U(1) atoms. In the fourth F site, F(4) is bonded in a trigonal planar geometry to one U(2) and two equivalent U(1) atoms. In the fifth F site, F(5) is bonded in a distorted trigonal planar geometry to one U(2) and two equivalent U(1) atoms. In the sixth F site, F(6) is bonded in a distorted trigonal planar geometry to one U(2) and two equivalent U(1) atoms.
UF3 crystallizes in the orthorhombic Cmc2_1 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 8-coordinate geometry to one F(2), one F(3), one F(6), two equivalent F(4), two equivalent F(5), and three equivalent F(1) atoms. The U(1)-F(2) bond length is 2.81 Å. The U(1)-F(3) bond length is 2.41 Å. The U(1)-F(6) bond length is 2.50 Å. Both U(1)-F(4) bond lengths are 2.42 Å. There is one shorter (2.46 Å) and one longer (2.50 Å) U(1)-F(5) bond length. There are a spread of U(1)-F(1) bond distances ranging from 2.45-2.83 Å. In the second U site, U(2) is bonded in a 10-coordinate geometry to one F(3), one F(6), two equivalent F(1), two equivalent F(2), two equivalent F(4), and two equivalent F(5) atoms. The U(2)-F(3) bond length is 2.38 Å. The U(2)-F(6) bond length is 2.45 Å. Both U(2)-F(1) bond lengths are 2.75 Å. There is one shorter (2.46 Å) and one longer (2.47 Å) U(2)-F(2) bond length. Both U(2)-F(4) bond lengths are 2.45 Å. Both U(2)-F(5) bond lengths are 2.52 Å. There are six inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to one U(2) and three equivalent U(1) atoms. In the second F site, F(2) is bonded in a 4-coordinate geometry to two equivalent U(1) and two equivalent U(2) atoms. In the third F site, F(3) is bonded in a trigonal non-coplanar geometry to one U(2) and two equivalent U(1) atoms. In the fourth F site, F(4) is bonded in a trigonal planar geometry to one U(2) and two equivalent U(1) atoms. In the fifth F site, F(5) is bonded in a distorted trigonal planar geometry to one U(2) and two equivalent U(1) atoms. In the sixth F site, F(6) is bonded in a distorted trigonal planar geometry to one U(2) and two equivalent U(1) atoms.