Na4Eu2SnAs4 is alpha Pu-derived structured and crystallizes in the monoclinic Cc space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one As(1), one As(2), one As(3), and two equivalent As(4) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one As(1), one As(4), and two equivalent As(3) atoms. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one As(1), one As(4), and two equivalent As(2) atoms. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one As(1), one As(2), one As(3), and one As(4) atom. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 3-coordinate geometry to one As(1), one As(2), one As(3), and two equivalent As(4) atoms. In the second Eu site, Eu(2) is bonded in a 3-coordinate geometry to one As(1), two equivalent As(2), and two equivalent As(3) atoms. Sn(1) is bonded in a 4-coordinate geometry to one As(1), one As(2), one As(3), and one As(4) atom. There are four inequivalent As sites. In the first As site, As(4) is bonded in a 8-coordinate geometry to one Na(2), one Na(3), one Na(4), two equivalent Na(1), two equivalent Eu(1), and one Sn(1) atom. In the second As site, As(1) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Eu(1), one Eu(2), and one Sn(1) atom. In the third As site, As(2) is bonded in a 8-coordinate geometry to one Na(1), one Na(4), two equivalent Na(3), one Eu(1), two equivalent Eu(2), and one Sn(1) atom. In the fourth As site, As(3) is bonded in a 8-coordinate geometry to one Na(1), one Na(4), two equivalent Na(2), one Eu(1), two equivalent Eu(2), and one Sn(1) atom.
Na4Eu2SnAs4 is alpha Pu-derived structured and crystallizes in the monoclinic Cc space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one As(1), one As(2), one As(3), and two equivalent As(4) atoms. The Na(1)-As(1) bond length is 3.06 Å. The Na(1)-As(2) bond length is 3.52 Å. The Na(1)-As(3) bond length is 3.20 Å. There is one shorter (3.16 Å) and one longer (3.48 Å) Na(1)-As(4) bond length. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one As(1), one As(4), and two equivalent As(3) atoms. The Na(2)-As(1) bond length is 3.23 Å. The Na(2)-As(4) bond length is 2.93 Å. There is one shorter (2.96 Å) and one longer (3.06 Å) Na(2)-As(3) bond length. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one As(1), one As(4), and two equivalent As(2) atoms. The Na(3)-As(1) bond length is 3.19 Å. The Na(3)-As(4) bond length is 2.91 Å. There is one shorter (2.96 Å) and one longer (3.13 Å) Na(3)-As(2) bond length. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to one As(1), one As(2), one As(3), and one As(4) atom. The Na(4)-As(1) bond length is 3.27 Å. The Na(4)-As(2) bond length is 3.00 Å. The Na(4)-As(3) bond length is 2.98 Å. The Na(4)-As(4) bond length is 3.07 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 3-coordinate geometry to one As(1), one As(2), one As(3), and two equivalent As(4) atoms. The Eu(1)-As(1) bond length is 3.12 Å. The Eu(1)-As(2) bond length is 3.16 Å. The Eu(1)-As(3) bond length is 3.38 Å. There is one shorter (3.14 Å) and one longer (3.39 Å) Eu(1)-As(4) bond length. In the second Eu site, Eu(2) is bonded in a 3-coordinate geometry to one As(1), two equivalent As(2), and two equivalent As(3) atoms. The Eu(2)-As(1) bond length is 3.05 Å. There is one shorter (3.13 Å) and one longer (3.43 Å) Eu(2)-As(2) bond length. There is one shorter (3.12 Å) and one longer (3.36 Å) Eu(2)-As(3) bond length. Sn(1) is bonded in a 4-coordinate geometry to one As(1), one As(2), one As(3), and one As(4) atom. The Sn(1)-As(1) bond length is 2.68 Å. The Sn(1)-As(2) bond length is 2.63 Å. The Sn(1)-As(3) bond length is 2.65 Å. The Sn(1)-As(4) bond length is 2.60 Å. There are four inequivalent As sites. In the first As site, As(4) is bonded in a 8-coordinate geometry to one Na(2), one Na(3), one Na(4), two equivalent Na(1), two equivalent Eu(1), and one Sn(1) atom. In the second As site, As(1) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Eu(1), one Eu(2), and one Sn(1) atom. In the third As site, As(2) is bonded in a 8-coordinate geometry to one Na(1), one Na(4), two equivalent Na(3), one Eu(1), two equivalent Eu(2), and one Sn(1) atom. In the fourth As site, As(3) is bonded in a 8-coordinate geometry to one Na(1), one Na(4), two equivalent Na(2), one Eu(1), two equivalent Eu(2), and one Sn(1) atom.