Eu4Ir8As7 crystallizes in the monoclinic P2_1/m space group. There are four inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 15-coordinate geometry to one Ir(4), one Ir(5), two equivalent Ir(2), two equivalent Ir(7), three equivalent Ir(8), two equivalent As(2), two equivalent As(4), and two equivalent As(5) atoms. In the second Eu site, Eu(2) is bonded in a 15-coordinate geometry to one Ir(2), one Ir(6), two equivalent Ir(1), two equivalent Ir(7), three equivalent Ir(4), two equivalent As(3), two equivalent As(5), and two equivalent As(6) atoms. In the third Eu site, Eu(3) is bonded in a 1-coordinate geometry to one Ir(1), two equivalent Ir(7), three equivalent Ir(6), one As(7), two equivalent As(1), two equivalent As(3), and two equivalent As(4) atoms. In the fourth Eu site, Eu(4) is bonded in a 1-coordinate geometry to one Ir(1), one Ir(8), two equivalent Ir(5), one As(6), two equivalent As(1), two equivalent As(2), and two equivalent As(7) atoms. There are eight inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 10-coordinate geometry to one Eu(3), one Eu(4), two equivalent Eu(2), two equivalent Ir(6), one As(3), one As(6), and two equivalent As(1) atoms. In the second Ir site, Ir(2) is bonded in a 7-coordinate geometry to one Eu(2), two equivalent Eu(1), two equivalent Ir(4), one As(2), one As(5), and two equivalent As(6) atoms. In the third Ir site, Ir(3) is bonded in a 4-coordinate geometry to one As(1) and three equivalent As(7) atoms. In the fourth Ir site, Ir(4) is bonded in a 12-coordinate geometry to one Eu(1), three equivalent Eu(2), two equivalent Ir(2), two equivalent Ir(4), one As(6), and three equivalent As(5) atoms. In the fifth Ir site, Ir(5) is bonded in a 7-coordinate geometry to one Eu(1), two equivalent Eu(4), two equivalent Ir(8), one As(2), one As(7), and two equivalent As(4) atoms. In the sixth Ir site, Ir(6) is bonded in a 12-coordinate geometry to one Eu(2), three equivalent Eu(3), two equivalent Ir(1), two equivalent Ir(6), one As(1), and three equivalent As(3) atoms. In the seventh Ir site, Ir(7) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), one As(3), one As(4), and one As(5) atom. In the eighth Ir site, Ir(8) is bonded to one Eu(4), three equivalent Eu(1), two equivalent Ir(5), two equivalent Ir(8), one As(4), and three equivalent As(2) atoms to form distorted face-sharing IrEu4As4Ir4 cuboctahedra. There are seven inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Eu(3), two equivalent Eu(4), one Ir(3), one Ir(6), and two equivalent Ir(1) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(4), one Ir(2), one Ir(5), and three equivalent Ir(8) atoms. In the third As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Eu(2), two equivalent Eu(3), one Ir(1), one Ir(7), and three equivalent Ir(6) atoms. In the fourth As site, As(4) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(3), one Ir(7), one Ir(8), and two equivalent Ir(5) atoms. In the fifth As site, As(5) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Ir(2), one Ir(7), and three equivalent Ir(4) atoms. In the sixth As site, As(6) is bonded in a 7-coordinate geometry to one Eu(4), two equivalent Eu(2), one Ir(1), one Ir(4), and two equivalent Ir(2) atoms. In the seventh As site, As(7) is bonded in a 7-coordinate geometry to one Eu(3), two equivalent Eu(4), one Ir(5), and three equivalent Ir(3) atoms.
Eu4Ir8As7 crystallizes in the monoclinic P2_1/m space group. There are four inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 15-coordinate geometry to one Ir(4), one Ir(5), two equivalent Ir(2), two equivalent Ir(7), three equivalent Ir(8), two equivalent As(2), two equivalent As(4), and two equivalent As(5) atoms. The Eu(1)-Ir(4) bond length is 3.23 Å. The Eu(1)-Ir(5) bond length is 3.16 Å. Both Eu(1)-Ir(2) bond lengths are 3.27 Å. Both Eu(1)-Ir(7) bond lengths are 3.27 Å. There is one shorter (3.29 Å) and two longer (3.33 Å) Eu(1)-Ir(8) bond lengths. Both Eu(1)-As(2) bond lengths are 3.16 Å. Both Eu(1)-As(4) bond lengths are 3.14 Å. Both Eu(1)-As(5) bond lengths are 3.11 Å. In the second Eu site, Eu(2) is bonded in a 15-coordinate geometry to one Ir(2), one Ir(6), two equivalent Ir(1), two equivalent Ir(7), three equivalent Ir(4), two equivalent As(3), two equivalent As(5), and two equivalent As(6) atoms. The Eu(2)-Ir(2) bond length is 3.29 Å. The Eu(2)-Ir(6) bond length is 3.26 Å. Both Eu(2)-Ir(1) bond lengths are 3.31 Å. Both Eu(2)-Ir(7) bond lengths are 3.15 Å. There is one shorter (3.28 Å) and two longer (3.39 Å) Eu(2)-Ir(4) bond lengths. Both Eu(2)-As(3) bond lengths are 3.15 Å. Both Eu(2)-As(5) bond lengths are 3.14 Å. Both Eu(2)-As(6) bond lengths are 3.13 Å. In the third Eu site, Eu(3) is bonded in a 1-coordinate geometry to one Ir(1), two equivalent Ir(7), three equivalent Ir(6), one As(7), two equivalent As(1), two equivalent As(3), and two equivalent As(4) atoms. The Eu(3)-Ir(1) bond length is 3.28 Å. Both Eu(3)-Ir(7) bond lengths are 3.21 Å. There are two shorter (3.43 Å) and one longer (3.48 Å) Eu(3)-Ir(6) bond length. The Eu(3)-As(7) bond length is 2.99 Å. Both Eu(3)-As(1) bond lengths are 3.32 Å. Both Eu(3)-As(3) bond lengths are 3.22 Å. Both Eu(3)-As(4) bond lengths are 3.43 Å. In the fourth Eu site, Eu(4) is bonded in a 1-coordinate geometry to one Ir(1), one Ir(8), two equivalent Ir(5), one As(6), two equivalent As(1), two equivalent As(2), and two equivalent As(7) atoms. The Eu(4)-Ir(1) bond length is 3.41 Å. The Eu(4)-Ir(8) bond length is 3.57 Å. Both Eu(4)-Ir(5) bond lengths are 3.19 Å. The Eu(4)-As(6) bond length is 2.89 Å. Both Eu(4)-As(1) bond lengths are 3.50 Å. Both Eu(4)-As(2) bond lengths are 3.51 Å. Both Eu(4)-As(7) bond lengths are 3.14 Å. There are eight inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 10-coordinate geometry to one Eu(3), one Eu(4), two equivalent Eu(2), two equivalent Ir(6), one As(3), one As(6), and two equivalent As(1) atoms. Both Ir(1)-Ir(6) bond lengths are 2.84 Å. The Ir(1)-As(3) bond length is 2.48 Å. The Ir(1)-As(6) bond length is 2.45 Å. Both Ir(1)-As(1) bond lengths are 2.42 Å. In the second Ir site, Ir(2) is bonded in a 7-coordinate geometry to one Eu(2), two equivalent Eu(1), two equivalent Ir(4), one As(2), one As(5), and two equivalent As(6) atoms. Both Ir(2)-Ir(4) bond lengths are 2.90 Å. The Ir(2)-As(2) bond length is 2.44 Å. The Ir(2)-As(5) bond length is 2.50 Å. Both Ir(2)-As(6) bond lengths are 2.45 Å. In the third Ir site, Ir(3) is bonded in a 4-coordinate geometry to one As(1) and three equivalent As(7) atoms. The Ir(3)-As(1) bond length is 2.42 Å. There is one shorter (2.44 Å) and two longer (2.45 Å) Ir(3)-As(7) bond lengths. In the fourth Ir site, Ir(4) is bonded in a 12-coordinate geometry to one Eu(1), three equivalent Eu(2), two equivalent Ir(2), two equivalent Ir(4), one As(6), and three equivalent As(5) atoms. Both Ir(4)-Ir(4) bond lengths are 2.87 Å. The Ir(4)-As(6) bond length is 2.46 Å. There are two shorter (2.48 Å) and one longer (2.52 Å) Ir(4)-As(5) bond length. In the fifth Ir site, Ir(5) is bonded in a 7-coordinate geometry to one Eu(1), two equivalent Eu(4), two equivalent Ir(8), one As(2), one As(7), and two equivalent As(4) atoms. Both Ir(5)-Ir(8) bond lengths are 2.87 Å. The Ir(5)-As(2) bond length is 2.48 Å. The Ir(5)-As(7) bond length is 2.44 Å. Both Ir(5)-As(4) bond lengths are 2.41 Å. In the sixth Ir site, Ir(6) is bonded in a 12-coordinate geometry to one Eu(2), three equivalent Eu(3), two equivalent Ir(1), two equivalent Ir(6), one As(1), and three equivalent As(3) atoms. Both Ir(6)-Ir(6) bond lengths are 2.91 Å. The Ir(6)-As(1) bond length is 2.59 Å. There is one shorter (2.46 Å) and two longer (2.50 Å) Ir(6)-As(3) bond lengths. In the seventh Ir site, Ir(7) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), one As(3), one As(4), and one As(5) atom. The Ir(7)-As(3) bond length is 2.44 Å. The Ir(7)-As(4) bond length is 2.39 Å. The Ir(7)-As(5) bond length is 2.47 Å. In the eighth Ir site, Ir(8) is bonded to one Eu(4), three equivalent Eu(1), two equivalent Ir(5), two equivalent Ir(8), one As(4), and three equivalent As(2) atoms to form distorted face-sharing IrEu4As4Ir4 cuboctahedra. Both Ir(8)-Ir(8) bond lengths are 2.85 Å. The Ir(8)-As(4) bond length is 2.49 Å. There are two shorter (2.52 Å) and one longer (2.55 Å) Ir(8)-As(2) bond length. There are seven inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Eu(3), two equivalent Eu(4), one Ir(3), one Ir(6), and two equivalent Ir(1) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(4), one Ir(2), one Ir(5), and three equivalent Ir(8) atoms. In the third As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Eu(2), two equivalent Eu(3), one Ir(1), one Ir(7), and three equivalent Ir(6) atoms. In the fourth As site, As(4) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(3), one Ir(7), one Ir(8), and two equivalent Ir(5) atoms. In the fifth As site, As(5) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Ir(2), one Ir(7), and three equivalent Ir(4) atoms. In the sixth As site, As(6) is bonded in a 7-coordinate geometry to one Eu(4), two equivalent Eu(2), one Ir(1), one Ir(4), and two equivalent Ir(2) atoms. In the seventh As site, As(7) is bonded in a 7-coordinate geometry to one Eu(3), two equivalent Eu(4), one Ir(5), and three equivalent Ir(3) atoms.