Hf2CuGa3 crystallizes in the monoclinic Cm space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 12-coordinate geometry to three equivalent Cu(1), three equivalent Ga(1), three equivalent Ga(2), and three equivalent Ga(3) atoms. In the second Hf site, Hf(2) is bonded in a 10-coordinate geometry to three equivalent Cu(1), three equivalent Ga(1), three equivalent Ga(2), and three equivalent Ga(3) atoms. Cu(1) is bonded in a 10-coordinate geometry to three equivalent Hf(1), three equivalent Hf(2), one Ga(1), one Ga(3), and two equivalent Ga(2) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to three equivalent Hf(1), three equivalent Hf(2), one Cu(1), one Ga(2), and two equivalent Ga(3) atoms. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to three equivalent Hf(1), three equivalent Hf(2), two equivalent Cu(1), one Ga(1), and one Ga(3) atom. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to three equivalent Hf(1), three equivalent Hf(2), one Cu(1), one Ga(2), and two equivalent Ga(1) atoms.
Hf2CuGa3 crystallizes in the monoclinic Cm space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 12-coordinate geometry to three equivalent Cu(1), three equivalent Ga(1), three equivalent Ga(2), and three equivalent Ga(3) atoms. There are two shorter (3.00 Å) and one longer (3.06 Å) Hf(1)-Cu(1) bond length. There are two shorter (2.87 Å) and one longer (2.91 Å) Hf(1)-Ga(1) bond length. There is one shorter (2.82 Å) and two longer (2.92 Å) Hf(1)-Ga(2) bond lengths. There are two shorter (2.89 Å) and one longer (3.17 Å) Hf(1)-Ga(3) bond length. In the second Hf site, Hf(2) is bonded in a 10-coordinate geometry to three equivalent Cu(1), three equivalent Ga(1), three equivalent Ga(2), and three equivalent Ga(3) atoms. There are two shorter (2.87 Å) and one longer (2.92 Å) Hf(2)-Cu(1) bond length. There are two shorter (2.84 Å) and one longer (3.27 Å) Hf(2)-Ga(1) bond length. There are two shorter (2.92 Å) and one longer (3.10 Å) Hf(2)-Ga(2) bond length. All Hf(2)-Ga(3) bond lengths are 2.88 Å. Cu(1) is bonded in a 10-coordinate geometry to three equivalent Hf(1), three equivalent Hf(2), one Ga(1), one Ga(3), and two equivalent Ga(2) atoms. The Cu(1)-Ga(1) bond length is 2.40 Å. The Cu(1)-Ga(3) bond length is 2.57 Å. Both Cu(1)-Ga(2) bond lengths are 2.37 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 10-coordinate geometry to three equivalent Hf(1), three equivalent Hf(2), one Cu(1), one Ga(2), and two equivalent Ga(3) atoms. The Ga(1)-Ga(2) bond length is 2.77 Å. Both Ga(1)-Ga(3) bond lengths are 2.49 Å. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to three equivalent Hf(1), three equivalent Hf(2), two equivalent Cu(1), one Ga(1), and one Ga(3) atom. The Ga(2)-Ga(3) bond length is 2.53 Å. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to three equivalent Hf(1), three equivalent Hf(2), one Cu(1), one Ga(2), and two equivalent Ga(1) atoms.