Ho3(RuSi3)4 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 18-coordinate geometry to two equivalent Ru(1), four equivalent Ru(2), four equivalent Si(2), four equivalent Si(3), and four equivalent Si(4) atoms. In the second Ho site, Ho(2) is bonded in a 16-coordinate geometry to four Ru(1,1,1); four equivalent Si(1); four equivalent Si(3); and four equivalent Si(4) atoms. There are six inequivalent Ru sites. In the first Ru site, Ru(2) is bonded in a 7-coordinate geometry to two equivalent Ho(1), two equivalent Si(3), two equivalent Si(4), and three equivalent Si(2) atoms. In the second Ru site, Ru(2) is bonded in a 7-coordinate geometry to two equivalent Ho(1), two equivalent Si(3), two equivalent Si(4), and three equivalent Si(2) atoms. In the third Ru site, Ru(2) is bonded in a 7-coordinate geometry to two equivalent Ho(1), two equivalent Si(3), two equivalent Si(4), and three equivalent Si(2) atoms. In the fourth Ru site, Ru(1) is bonded in a 5-coordinate geometry to one Ho(1), four equivalent Ho(2), one Si(1), two equivalent Si(3), and two equivalent Si(4) atoms. In the fifth Ru site, Ru(1) is bonded in a 5-coordinate geometry to one Ho(1), four equivalent Ho(2), one Si(1), two equivalent Si(3), and two equivalent Si(4) atoms. In the sixth Ru site, Ru(1) is bonded in a 5-coordinate geometry to one Ho(1), four equivalent Ho(2), one Si(1), two equivalent Si(3), and two equivalent Si(4) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ho(2), one Ru(1), two equivalent Si(3), and two equivalent Si(4) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Ho(1), three equivalent Ru(2), two equivalent Si(3), and two equivalent Si(4) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to one Ho(1), two equivalent Ho(2), one Ru(1), one Ru(2), one Si(1), one Si(2), and two equivalent Si(4) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to one Ho(1), two equivalent Ho(2), one Ru(1), one Ru(2), one Si(1), one Si(2), and two equivalent Si(3) atoms.
Ho3(RuSi3)4 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 18-coordinate geometry to two equivalent Ru(1), four equivalent Ru(2), four equivalent Si(2), four equivalent Si(3), and four equivalent Si(4) atoms. Both Ho(1)-Ru(1) bond lengths are 3.14 Å. All Ho(1)-Ru(2) bond lengths are 3.20 Å. All Ho(1)-Si(2) bond lengths are 3.03 Å. All Ho(1)-Si(3) bond lengths are 3.09 Å. All Ho(1)-Si(4) bond lengths are 3.09 Å. In the second Ho site, Ho(2) is bonded in a 16-coordinate geometry to four Ru(1,1,1); four equivalent Si(1); four equivalent Si(3); and four equivalent Si(4) atoms. There are two shorter (3.22 Å) and two longer (3.26 Å) Ho(2)-Ru(1,1,1) bond lengths. There are two shorter (2.97 Å) and two longer (3.01 Å) Ho(2)-Si(1) bond lengths. There are two shorter (3.18 Å) and two longer (3.21 Å) Ho(2)-Si(3) bond lengths. There are two shorter (3.16 Å) and two longer (3.23 Å) Ho(2)-Si(4) bond lengths. There are six inequivalent Ru sites. In the first Ru site, Ru(2) is bonded in a 7-coordinate geometry to two equivalent Ho(1), two equivalent Si(3), two equivalent Si(4), and three equivalent Si(2) atoms. Both Ru(2)-Si(3) bond lengths are 2.52 Å. Both Ru(2)-Si(4) bond lengths are 2.52 Å. There is one shorter (2.37 Å) and two longer (2.41 Å) Ru(2)-Si(2) bond lengths. In the second Ru site, Ru(2) is bonded in a 7-coordinate geometry to two equivalent Ho(1), two equivalent Si(3), two equivalent Si(4), and three equivalent Si(2) atoms. Both Ru(2)-Ho(1) bond lengths are 3.20 Å. Both Ru(2)-Si(3) bond lengths are 2.52 Å. Both Ru(2)-Si(4) bond lengths are 2.52 Å. There is one shorter (2.37 Å) and two longer (2.41 Å) Ru(2)-Si(2) bond lengths. In the third Ru site, Ru(2) is bonded in a 7-coordinate geometry to two equivalent Ho(1), two equivalent Si(3), two equivalent Si(4), and three equivalent Si(2) atoms. Both Ru(2)-Ho(1) bond lengths are 3.20 Å. Both Ru(2)-Si(3) bond lengths are 2.52 Å. Both Ru(2)-Si(4) bond lengths are 2.52 Å. There is one shorter (2.37 Å) and two longer (2.41 Å) Ru(2)-Si(2) bond lengths. In the fourth Ru site, Ru(1) is bonded in a 5-coordinate geometry to one Ho(1), four equivalent Ho(2), one Si(1), two equivalent Si(3), and two equivalent Si(4) atoms. The Ru(1)-Si(1) bond length is 2.32 Å. Both Ru(1)-Si(3) bond lengths are 2.41 Å. Both Ru(1)-Si(4) bond lengths are 2.40 Å. In the fifth Ru site, Ru(1) is bonded in a 5-coordinate geometry to one Ho(1), four equivalent Ho(2), one Si(1), two equivalent Si(3), and two equivalent Si(4) atoms. The Ru(1)-Ho(1) bond length is 3.14 Å. The Ru(1)-Si(1) bond length is 2.32 Å. Both Ru(1)-Si(3) bond lengths are 2.41 Å. Both Ru(1)-Si(4) bond lengths are 2.40 Å. In the sixth Ru site, Ru(1) is bonded in a 5-coordinate geometry to one Ho(1), four equivalent Ho(2), one Si(1), two equivalent Si(3), and two equivalent Si(4) atoms. The Ru(1)-Ho(1) bond length is 3.14 Å. The Ru(1)-Si(1) bond length is 2.32 Å. Both Ru(1)-Si(3) bond lengths are 2.41 Å. Both Ru(1)-Si(4) bond lengths are 2.40 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ho(2), one Ru(1), two equivalent Si(3), and two equivalent Si(4) atoms. Both Si(1)-Si(3) bond lengths are 2.47 Å. Both Si(1)-Si(4) bond lengths are 2.47 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Ho(1), three equivalent Ru(2), two equivalent Si(3), and two equivalent Si(4) atoms. Both Si(2)-Si(3) bond lengths are 2.63 Å. Both Si(2)-Si(4) bond lengths are 2.64 Å. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to one Ho(1), two equivalent Ho(2), one Ru(1), one Ru(2), one Si(1), one Si(2), and two equivalent Si(4) atoms. There is one shorter (2.56 Å) and one longer (2.71 Å) Si(3)-Si(4) bond length. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to one Ho(1), two equivalent Ho(2), one Ru(1), one Ru(2), one Si(1), one Si(2), and two equivalent Si(3) atoms.