Eu(IrGa4)2 crystallizes in the orthorhombic Pbam space group. Eu(1) is bonded in a 13-coordinate geometry to one Ga(2), two equivalent Ga(4), two equivalent Ga(5), two equivalent Ga(6), two equivalent Ga(7), two equivalent Ga(8), and two equivalent Ga(9) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 9-coordinate geometry to one Ga(2), one Ga(3), one Ga(4), two equivalent Ga(7), two equivalent Ga(8), and two equivalent Ga(9) atoms. In the second Ir site, Ir(2) is bonded in a 9-coordinate geometry to one Ga(4), two equivalent Ga(1), two equivalent Ga(3), two equivalent Ga(5), and two equivalent Ga(6) atoms. There are nine inequivalent Ga sites. In the first Ga site, Ga(9) is bonded in a 12-coordinate geometry to two equivalent Eu(1), two equivalent Ir(1), one Ga(5), one Ga(8), two equivalent Ga(2), two equivalent Ga(4), and two equivalent Ga(7) atoms. In the second Ga site, Ga(1) is bonded in a 4-coordinate geometry to four equivalent Ir(2) and two equivalent Ga(5) atoms. In the third Ga site, Ga(2) is bonded in a distorted linear geometry to two equivalent Eu(1), two equivalent Ir(1), and four equivalent Ga(9) atoms. In the fourth Ga site, Ga(3) is bonded in a 3-coordinate geometry to one Ir(1) and two equivalent Ir(2) atoms. In the fifth Ga site, Ga(4) is bonded in a distorted linear geometry to two equivalent Eu(1), one Ir(1), one Ir(2), two equivalent Ga(5), and two equivalent Ga(9) atoms. In the sixth Ga site, Ga(5) is bonded in a 10-coordinate geometry to two equivalent Eu(1), two equivalent Ir(2), one Ga(1), one Ga(6), one Ga(8), one Ga(9), and two equivalent Ga(4) atoms. In the seventh Ga site, Ga(6) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Ir(2), one Ga(5), and one Ga(7) atom. In the eighth Ga site, Ga(7) is bonded in a 2-coordinate geometry to two equivalent Eu(1), two equivalent Ir(1), one Ga(6), and two equivalent Ga(9) atoms. In the ninth Ga site, Ga(8) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Ir(1), one Ga(5), and one Ga(9) atom.
Eu(IrGa4)2 crystallizes in the orthorhombic Pbam space group. Eu(1) is bonded in a 13-coordinate geometry to one Ga(2), two equivalent Ga(4), two equivalent Ga(5), two equivalent Ga(6), two equivalent Ga(7), two equivalent Ga(8), and two equivalent Ga(9) atoms. The Eu(1)-Ga(2) bond length is 3.32 Å. There is one shorter (3.24 Å) and one longer (3.44 Å) Eu(1)-Ga(4) bond length. Both Eu(1)-Ga(5) bond lengths are 3.18 Å. Both Eu(1)-Ga(6) bond lengths are 3.17 Å. Both Eu(1)-Ga(7) bond lengths are 3.23 Å. Both Eu(1)-Ga(8) bond lengths are 3.23 Å. Both Eu(1)-Ga(9) bond lengths are 3.15 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 9-coordinate geometry to one Ga(2), one Ga(3), one Ga(4), two equivalent Ga(7), two equivalent Ga(8), and two equivalent Ga(9) atoms. The Ir(1)-Ga(2) bond length is 2.42 Å. The Ir(1)-Ga(3) bond length is 2.47 Å. The Ir(1)-Ga(4) bond length is 2.40 Å. Both Ir(1)-Ga(7) bond lengths are 2.63 Å. Both Ir(1)-Ga(8) bond lengths are 2.65 Å. Both Ir(1)-Ga(9) bond lengths are 2.76 Å. In the second Ir site, Ir(2) is bonded in a 9-coordinate geometry to one Ga(4), two equivalent Ga(1), two equivalent Ga(3), two equivalent Ga(5), and two equivalent Ga(6) atoms. The Ir(2)-Ga(4) bond length is 2.38 Å. Both Ir(2)-Ga(1) bond lengths are 2.57 Å. There is one shorter (2.59 Å) and one longer (2.60 Å) Ir(2)-Ga(3) bond length. Both Ir(2)-Ga(5) bond lengths are 2.69 Å. Both Ir(2)-Ga(6) bond lengths are 2.71 Å. There are nine inequivalent Ga sites. In the first Ga site, Ga(9) is bonded in a 12-coordinate geometry to two equivalent Eu(1), two equivalent Ir(1), one Ga(5), one Ga(8), two equivalent Ga(2), two equivalent Ga(4), and two equivalent Ga(7) atoms. The Ga(9)-Ga(5) bond length is 2.82 Å. The Ga(9)-Ga(8) bond length is 2.89 Å. Both Ga(9)-Ga(2) bond lengths are 2.87 Å. Both Ga(9)-Ga(4) bond lengths are 2.90 Å. There is one shorter (2.87 Å) and one longer (3.00 Å) Ga(9)-Ga(7) bond length. In the second Ga site, Ga(1) is bonded in a 4-coordinate geometry to four equivalent Ir(2) and two equivalent Ga(5) atoms. Both Ga(1)-Ga(5) bond lengths are 2.79 Å. In the third Ga site, Ga(2) is bonded in a distorted linear geometry to two equivalent Eu(1), two equivalent Ir(1), and four equivalent Ga(9) atoms. In the fourth Ga site, Ga(3) is bonded in a 3-coordinate geometry to one Ir(1) and two equivalent Ir(2) atoms. In the fifth Ga site, Ga(4) is bonded in a distorted linear geometry to two equivalent Eu(1), one Ir(1), one Ir(2), two equivalent Ga(5), and two equivalent Ga(9) atoms. Both Ga(4)-Ga(5) bond lengths are 2.99 Å. In the sixth Ga site, Ga(5) is bonded in a 10-coordinate geometry to two equivalent Eu(1), two equivalent Ir(2), one Ga(1), one Ga(6), one Ga(8), one Ga(9), and two equivalent Ga(4) atoms. The Ga(5)-Ga(6) bond length is 2.92 Å. The Ga(5)-Ga(8) bond length is 2.64 Å. In the seventh Ga site, Ga(6) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Ir(2), one Ga(5), and one Ga(7) atom. The Ga(6)-Ga(7) bond length is 2.63 Å. In the eighth Ga site, Ga(7) is bonded in a 2-coordinate geometry to two equivalent Eu(1), two equivalent Ir(1), one Ga(6), and two equivalent Ga(9) atoms. In the ninth Ga site, Ga(8) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Ir(1), one Ga(5), and one Ga(9) atom.