Eu2Au2Sn5 is beta Plutonium-derived structured and crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 14-coordinate geometry to one Au(2), two equivalent Au(1), one Sn(1), two equivalent Sn(2), two equivalent Sn(5), three equivalent Sn(3), and three equivalent Sn(4) atoms. In the second Eu site, Eu(2) is bonded in a 13-coordinate geometry to two equivalent Au(1), two equivalent Au(2), one Sn(3), one Sn(4), two equivalent Sn(2), two equivalent Sn(5), and three equivalent Sn(1) atoms. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Sn(3), one Sn(5), and three equivalent Sn(1) atoms. In the second Au site, Au(2) is bonded in a 9-coordinate geometry to one Eu(1), two equivalent Eu(2), one Sn(2), two equivalent Sn(4), and three equivalent Sn(5) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one Eu(1), three equivalent Eu(2), and three equivalent Au(1) atoms. In the second Sn site, Sn(2) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Au(2), and two equivalent Sn(4) atoms. In the third Sn site, Sn(3) is bonded in a 2-coordinate geometry to one Eu(2), three equivalent Eu(1), and one Au(1) atom. In the fourth Sn site, Sn(4) is bonded in a 11-coordinate geometry to one Eu(2), three equivalent Eu(1), two equivalent Au(2), one Sn(5), two equivalent Sn(2), and two equivalent Sn(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 4-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Au(1), three equivalent Au(2), and one Sn(4) atom.
Eu2Au2Sn5 is beta Plutonium-derived structured and crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 14-coordinate geometry to one Au(2), two equivalent Au(1), one Sn(1), two equivalent Sn(2), two equivalent Sn(5), three equivalent Sn(3), and three equivalent Sn(4) atoms. The Eu(1)-Au(2) bond length is 3.34 Å. Both Eu(1)-Au(1) bond lengths are 3.37 Å. The Eu(1)-Sn(1) bond length is 3.66 Å. Both Eu(1)-Sn(2) bond lengths are 3.43 Å. Both Eu(1)-Sn(5) bond lengths are 3.59 Å. There is one shorter (3.32 Å) and two longer (3.70 Å) Eu(1)-Sn(3) bond lengths. There is one shorter (3.47 Å) and two longer (3.60 Å) Eu(1)-Sn(4) bond lengths. In the second Eu site, Eu(2) is bonded in a 13-coordinate geometry to two equivalent Au(1), two equivalent Au(2), one Sn(3), one Sn(4), two equivalent Sn(2), two equivalent Sn(5), and three equivalent Sn(1) atoms. Both Eu(2)-Au(1) bond lengths are 3.51 Å. Both Eu(2)-Au(2) bond lengths are 3.32 Å. The Eu(2)-Sn(3) bond length is 3.76 Å. The Eu(2)-Sn(4) bond length is 3.58 Å. Both Eu(2)-Sn(2) bond lengths are 3.45 Å. Both Eu(2)-Sn(5) bond lengths are 3.35 Å. There are two shorter (3.36 Å) and one longer (3.59 Å) Eu(2)-Sn(1) bond length. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 9-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Sn(3), one Sn(5), and three equivalent Sn(1) atoms. The Au(1)-Sn(3) bond length is 2.79 Å. The Au(1)-Sn(5) bond length is 2.73 Å. There are two shorter (2.79 Å) and one longer (2.91 Å) Au(1)-Sn(1) bond length. In the second Au site, Au(2) is bonded in a 9-coordinate geometry to one Eu(1), two equivalent Eu(2), one Sn(2), two equivalent Sn(4), and three equivalent Sn(5) atoms. The Au(2)-Sn(2) bond length is 2.92 Å. Both Au(2)-Sn(4) bond lengths are 3.02 Å. There is one shorter (2.82 Å) and two longer (2.84 Å) Au(2)-Sn(5) bond lengths. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one Eu(1), three equivalent Eu(2), and three equivalent Au(1) atoms. In the second Sn site, Sn(2) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Au(2), and two equivalent Sn(4) atoms. Both Sn(2)-Sn(4) bond lengths are 3.30 Å. In the third Sn site, Sn(3) is bonded in a 2-coordinate geometry to one Eu(2), three equivalent Eu(1), and one Au(1) atom. In the fourth Sn site, Sn(4) is bonded in a 11-coordinate geometry to one Eu(2), three equivalent Eu(1), two equivalent Au(2), one Sn(5), two equivalent Sn(2), and two equivalent Sn(4) atoms. The Sn(4)-Sn(5) bond length is 2.99 Å. Both Sn(4)-Sn(4) bond lengths are 3.21 Å. In the fifth Sn site, Sn(5) is bonded in a 4-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), one Au(1), three equivalent Au(2), and one Sn(4) atom.