YHfF7 crystallizes in the monoclinic P2_1 space group. Y(1) is bonded in a 8-coordinate geometry to one F(2), one F(3), one F(4), one F(5), one F(6), one F(7), and two equivalent F(1) atoms. Hf(1) is bonded in an octahedral geometry to one F(2), one F(3), one F(4), one F(5), one F(6), and one F(7) atom. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a bent 150 degrees geometry to two equivalent Y(1) atoms. In the second F site, F(2) is bonded in a linear geometry to one Y(1) and one Hf(1) atom. In the third F site, F(3) is bonded in a linear geometry to one Y(1) and one Hf(1) atom. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one Y(1) and one Hf(1) atom. In the fifth F site, F(5) is bonded in a linear geometry to one Y(1) and one Hf(1) atom. In the sixth F site, F(6) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one Hf(1) atom. In the seventh F site, F(7) is bonded in a bent 150 degrees geometry to one Y(1) and one Hf(1) atom.
YHfF7 crystallizes in the monoclinic P2_1 space group. Y(1) is bonded in a 8-coordinate geometry to one F(2), one F(3), one F(4), one F(5), one F(6), one F(7), and two equivalent F(1) atoms. The Y(1)-F(2) bond length is 2.24 Å. The Y(1)-F(3) bond length is 2.27 Å. The Y(1)-F(4) bond length is 2.32 Å. The Y(1)-F(5) bond length is 2.31 Å. The Y(1)-F(6) bond length is 2.35 Å. The Y(1)-F(7) bond length is 2.29 Å. There is one shorter (2.17 Å) and one longer (2.20 Å) Y(1)-F(1) bond length. Hf(1) is bonded in an octahedral geometry to one F(2), one F(3), one F(4), one F(5), one F(6), and one F(7) atom. The Hf(1)-F(2) bond length is 1.99 Å. The Hf(1)-F(3) bond length is 2.00 Å. The Hf(1)-F(4) bond length is 1.99 Å. The Hf(1)-F(5) bond length is 1.98 Å. The Hf(1)-F(6) bond length is 1.99 Å. The Hf(1)-F(7) bond length is 2.00 Å. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a bent 150 degrees geometry to two equivalent Y(1) atoms. In the second F site, F(2) is bonded in a linear geometry to one Y(1) and one Hf(1) atom. In the third F site, F(3) is bonded in a linear geometry to one Y(1) and one Hf(1) atom. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one Y(1) and one Hf(1) atom. In the fifth F site, F(5) is bonded in a linear geometry to one Y(1) and one Hf(1) atom. In the sixth F site, F(6) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one Hf(1) atom. In the seventh F site, F(7) is bonded in a bent 150 degrees geometry to one Y(1) and one Hf(1) atom.