Ho4Ni10Ga21 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 7-coordinate geometry to two equivalent Ni(3), two equivalent Ni(4), one Ga(6), one Ga(7), two equivalent Ga(3), two equivalent Ga(8), and three equivalent Ga(5) atoms. In the second Ho site, Ho(2) is bonded in a 15-coordinate geometry to two equivalent Ni(1), two equivalent Ni(5), one Ga(1), one Ga(2), one Ga(8), one Ga(9), two equivalent Ga(11), two equivalent Ga(6), and three equivalent Ga(4) atoms. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to two equivalent Ho(2), one Ni(3), one Ga(11), one Ga(6), one Ga(7), two equivalent Ga(2), and two equivalent Ga(9) atoms. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to one Ga(9), two equivalent Ga(1), two equivalent Ga(10), two equivalent Ga(11), and two equivalent Ga(3) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent Ho(1), one Ni(1), one Ga(3), one Ga(7), two equivalent Ga(9), and three equivalent Ga(5) atoms. In the fourth Ni site, Ni(4) is bonded in a 10-coordinate geometry to two equivalent Ho(1), one Ga(5), one Ga(8), two equivalent Ga(2), two equivalent Ga(6), and two equivalent Ga(7) atoms. In the fifth Ni site, Ni(5) is bonded in a 7-coordinate geometry to two equivalent Ho(2), one Ga(1), one Ga(6), two equivalent Ga(8), and three equivalent Ga(4) atoms. There are eleven inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 3-coordinate geometry to one Ho(2), one Ni(5), two equivalent Ni(2), and two equivalent Ga(10) atoms. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to one Ho(2), two equivalent Ni(1), two equivalent Ni(4), one Ga(2), one Ga(9), two equivalent Ga(6), and two equivalent Ga(7) atoms. In the third Ga site, Ga(3) is bonded in a 5-coordinate geometry to two equivalent Ho(1), one Ni(3), two equivalent Ni(2), one Ga(10), and one Ga(8) atom. In the fourth Ga site, Ga(4) is bonded in a 5-coordinate geometry to three equivalent Ho(2), three equivalent Ni(5), and one Ga(8) atom. In the fifth Ga site, Ga(5) is bonded in a 12-coordinate geometry to three equivalent Ho(1), one Ni(4), three equivalent Ni(3), one Ga(9), two equivalent Ga(5), and two equivalent Ga(7) atoms. In the sixth Ga site, Ga(6) is bonded in a 12-coordinate geometry to one Ho(1), two equivalent Ho(2), one Ni(1), one Ni(5), two equivalent Ni(4), one Ga(7), two equivalent Ga(2), and two equivalent Ga(8) atoms. In the seventh Ga site, Ga(7) is bonded in a 10-coordinate geometry to one Ho(1), one Ni(1), one Ni(3), two equivalent Ni(4), one Ga(6), two equivalent Ga(2), and two equivalent Ga(5) atoms. In the eighth Ga site, Ga(8) is bonded in a 10-coordinate geometry to one Ho(2), two equivalent Ho(1), one Ni(4), two equivalent Ni(5), one Ga(3), one Ga(4), and two equivalent Ga(6) atoms. In the ninth Ga site, Ga(9) is bonded in a 5-coordinate geometry to one Ho(2), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), one Ga(2), and one Ga(5) atom. In the tenth Ga site, Ga(10) is bonded in a 12-coordinate geometry to four equivalent Ni(2), two equivalent Ga(11), two equivalent Ga(3), and four equivalent Ga(1) atoms. In the eleventh Ga site, Ga(11) is bonded in a 5-coordinate geometry to two equivalent Ho(2), one Ni(1), two equivalent Ni(2), and one Ga(10) atom.
Ho4Ni10Ga21 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 7-coordinate geometry to two equivalent Ni(3), two equivalent Ni(4), one Ga(6), one Ga(7), two equivalent Ga(3), two equivalent Ga(8), and three equivalent Ga(5) atoms. Both Ho(1)-Ni(3) bond lengths are 3.12 Å. Both Ho(1)-Ni(4) bond lengths are 3.15 Å. The Ho(1)-Ga(6) bond length is 3.17 Å. The Ho(1)-Ga(7) bond length is 2.96 Å. Both Ho(1)-Ga(3) bond lengths are 2.89 Å. Both Ho(1)-Ga(8) bond lengths are 2.93 Å. There are two shorter (3.00 Å) and one longer (3.20 Å) Ho(1)-Ga(5) bond length. In the second Ho site, Ho(2) is bonded in a 15-coordinate geometry to two equivalent Ni(1), two equivalent Ni(5), one Ga(1), one Ga(2), one Ga(8), one Ga(9), two equivalent Ga(11), two equivalent Ga(6), and three equivalent Ga(4) atoms. Both Ho(2)-Ni(1) bond lengths are 2.98 Å. Both Ho(2)-Ni(5) bond lengths are 3.14 Å. The Ho(2)-Ga(1) bond length is 3.40 Å. The Ho(2)-Ga(2) bond length is 3.07 Å. The Ho(2)-Ga(8) bond length is 3.05 Å. The Ho(2)-Ga(9) bond length is 3.19 Å. Both Ho(2)-Ga(11) bond lengths are 2.86 Å. Both Ho(2)-Ga(6) bond lengths are 3.00 Å. There are two shorter (2.96 Å) and one longer (3.10 Å) Ho(2)-Ga(4) bond length. There are five inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 10-coordinate geometry to two equivalent Ho(2), one Ni(3), one Ga(11), one Ga(6), one Ga(7), two equivalent Ga(2), and two equivalent Ga(9) atoms. The Ni(1)-Ni(3) bond length is 2.75 Å. The Ni(1)-Ga(11) bond length is 2.45 Å. The Ni(1)-Ga(6) bond length is 2.51 Å. The Ni(1)-Ga(7) bond length is 2.38 Å. Both Ni(1)-Ga(2) bond lengths are 2.55 Å. Both Ni(1)-Ga(9) bond lengths are 2.58 Å. In the second Ni site, Ni(2) is bonded in a 9-coordinate geometry to one Ga(9), two equivalent Ga(1), two equivalent Ga(10), two equivalent Ga(11), and two equivalent Ga(3) atoms. The Ni(2)-Ga(9) bond length is 2.51 Å. There is one shorter (2.50 Å) and one longer (2.54 Å) Ni(2)-Ga(1) bond length. Both Ni(2)-Ga(10) bond lengths are 2.48 Å. Both Ni(2)-Ga(11) bond lengths are 2.58 Å. Both Ni(2)-Ga(3) bond lengths are 2.60 Å. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two equivalent Ho(1), one Ni(1), one Ga(3), one Ga(7), two equivalent Ga(9), and three equivalent Ga(5) atoms. The Ni(3)-Ga(3) bond length is 2.48 Å. The Ni(3)-Ga(7) bond length is 2.47 Å. Both Ni(3)-Ga(9) bond lengths are 2.56 Å. There is one shorter (2.45 Å) and two longer (2.50 Å) Ni(3)-Ga(5) bond lengths. In the fourth Ni site, Ni(4) is bonded in a 10-coordinate geometry to two equivalent Ho(1), one Ga(5), one Ga(8), two equivalent Ga(2), two equivalent Ga(6), and two equivalent Ga(7) atoms. The Ni(4)-Ga(5) bond length is 2.69 Å. The Ni(4)-Ga(8) bond length is 2.53 Å. There is one shorter (2.52 Å) and one longer (2.70 Å) Ni(4)-Ga(2) bond length. Both Ni(4)-Ga(6) bond lengths are 2.52 Å. Both Ni(4)-Ga(7) bond lengths are 2.47 Å. In the fifth Ni site, Ni(5) is bonded in a 7-coordinate geometry to two equivalent Ho(2), one Ga(1), one Ga(6), two equivalent Ga(8), and three equivalent Ga(4) atoms. The Ni(5)-Ga(1) bond length is 2.37 Å. The Ni(5)-Ga(6) bond length is 2.62 Å. Both Ni(5)-Ga(8) bond lengths are 2.45 Å. All Ni(5)-Ga(4) bond lengths are 2.48 Å. There are eleven inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 3-coordinate geometry to one Ho(2), one Ni(5), two equivalent Ni(2), and two equivalent Ga(10) atoms. Both Ga(1)-Ga(10) bond lengths are 2.92 Å. In the second Ga site, Ga(2) is bonded in a 11-coordinate geometry to one Ho(2), two equivalent Ni(1), two equivalent Ni(4), one Ga(2), one Ga(9), two equivalent Ga(6), and two equivalent Ga(7) atoms. The Ga(2)-Ga(2) bond length is 2.70 Å. The Ga(2)-Ga(9) bond length is 2.90 Å. Both Ga(2)-Ga(6) bond lengths are 2.88 Å. Both Ga(2)-Ga(7) bond lengths are 2.74 Å. In the third Ga site, Ga(3) is bonded in a 5-coordinate geometry to two equivalent Ho(1), one Ni(3), two equivalent Ni(2), one Ga(10), and one Ga(8) atom. The Ga(3)-Ga(10) bond length is 2.66 Å. The Ga(3)-Ga(8) bond length is 2.89 Å. In the fourth Ga site, Ga(4) is bonded in a 5-coordinate geometry to three equivalent Ho(2), three equivalent Ni(5), and one Ga(8) atom. The Ga(4)-Ga(8) bond length is 2.68 Å. In the fifth Ga site, Ga(5) is bonded in a 12-coordinate geometry to three equivalent Ho(1), one Ni(4), three equivalent Ni(3), one Ga(9), two equivalent Ga(5), and two equivalent Ga(7) atoms. The Ga(5)-Ga(9) bond length is 2.82 Å. Both Ga(5)-Ga(5) bond lengths are 2.90 Å. Both Ga(5)-Ga(7) bond lengths are 2.88 Å. In the sixth Ga site, Ga(6) is bonded in a 12-coordinate geometry to one Ho(1), two equivalent Ho(2), one Ni(1), one Ni(5), two equivalent Ni(4), one Ga(7), two equivalent Ga(2), and two equivalent Ga(8) atoms. The Ga(6)-Ga(7) bond length is 2.82 Å. Both Ga(6)-Ga(8) bond lengths are 2.92 Å. In the seventh Ga site, Ga(7) is bonded in a 10-coordinate geometry to one Ho(1), one Ni(1), one Ni(3), two equivalent Ni(4), one Ga(6), two equivalent Ga(2), and two equivalent Ga(5) atoms. In the eighth Ga site, Ga(8) is bonded in a 10-coordinate geometry to one Ho(2), two equivalent Ho(1), one Ni(4), two equivalent Ni(5), one Ga(3), one Ga(4), and two equivalent Ga(6) atoms. In the ninth Ga site, Ga(9) is bonded in a 5-coordinate geometry to one Ho(2), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), one Ga(2), and one Ga(5) atom. In the tenth Ga site, Ga(10) is bonded in a 12-coordinate geometry to four equivalent Ni(2), two equivalent Ga(11), two equivalent Ga(3), and four equivalent Ga(1) atoms. Both Ga(10)-Ga(11) bond lengths are 2.57 Å. In the eleventh Ga site, Ga(11) is bonded in a 5-coordinate geometry to two equivalent Ho(2), one Ni(1), two equivalent Ni(2), and one Ga(10) atom.