Hf3(Cu2Si)2 crystallizes in the hexagonal P-62m space group. Hf(1) is bonded in a 11-coordinate geometry to one Cu(2), six equivalent Cu(1), and four equivalent Si(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to six equivalent Hf(1), two equivalent Cu(1), two equivalent Cu(2), and two equivalent Si(1) atoms to form a mixture of distorted edge, corner, and face-sharing CuHf6Cu4Si2 cuboctahedra. In the second Cu site, Cu(2) is bonded in a distorted trigonal planar geometry to three equivalent Hf(1) and six equivalent Cu(1) atoms. Si(1) is bonded in a 9-coordinate geometry to six equivalent Hf(1) and three equivalent Cu(1) atoms.
Hf3(Cu2Si)2 crystallizes in the hexagonal P-62m space group. Hf(1) is bonded in a 11-coordinate geometry to one Cu(2), six equivalent Cu(1), and four equivalent Si(1) atoms. The Hf(1)-Cu(2) bond length is 2.58 Å. There are two shorter (2.91 Å) and four longer (3.00 Å) Hf(1)-Cu(1) bond lengths. All Hf(1)-Si(1) bond lengths are 2.73 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to six equivalent Hf(1), two equivalent Cu(1), two equivalent Cu(2), and two equivalent Si(1) atoms to form a mixture of distorted edge, corner, and face-sharing CuHf6Cu4Si2 cuboctahedra. Both Cu(1)-Cu(1) bond lengths are 2.67 Å. Both Cu(1)-Cu(2) bond lengths are 2.51 Å. Both Cu(1)-Si(1) bond lengths are 2.40 Å. In the second Cu site, Cu(2) is bonded in a distorted trigonal planar geometry to three equivalent Hf(1) and six equivalent Cu(1) atoms. Si(1) is bonded in a 9-coordinate geometry to six equivalent Hf(1) and three equivalent Cu(1) atoms.