Na4Eu2GeAs4 is Magnesium tetraboride-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 6-coordinate geometry to two equivalent Eu(1), one Ge(1), 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 Eu(1), 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 Eu(1), 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 two equivalent Eu(1), 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 14-coordinate geometry to one Na(2), one Na(3), two equivalent Na(1), two equivalent Na(4), two equivalent Ge(1), one As(2), one As(3), two equivalent As(1), 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. Ge(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Eu(1), 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 Ge(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(2), two equivalent Eu(1), and one Ge(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 Ge(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 Ge(1) atom.
Na4Eu2GeAs4 is Magnesium tetraboride-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 6-coordinate geometry to two equivalent Eu(1), one Ge(1), one As(1), one As(2), one As(3), and two equivalent As(4) atoms. There is one shorter (3.75 Å) and one longer (3.76 Å) Na(1)-Eu(1) bond length. The Na(1)-Ge(1) bond length is 3.29 Å. The Na(1)-As(1) bond length is 3.15 Å. The Na(1)-As(2) bond length is 3.34 Å. The Na(1)-As(3) bond length is 3.15 Å. There is one shorter (3.14 Å) and one longer (3.34 Å) Na(1)-As(4) bond length. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one Eu(1), one As(1), one As(4), and two equivalent As(3) atoms. The Na(2)-Eu(1) bond length is 3.40 Å. The Na(2)-As(1) bond length is 3.17 Å. The Na(2)-As(4) bond length is 2.96 Å. There is one shorter (2.96 Å) and one longer (3.05 Å) Na(2)-As(3) bond length. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one Eu(1), one As(1), one As(4), and two equivalent As(2) atoms. The Na(3)-Eu(1) bond length is 3.69 Å. The Na(3)-As(1) bond length is 3.16 Å. The Na(3)-As(4) bond length is 2.94 Å. There is one shorter (2.97 Å) and one longer (3.08 Å) Na(3)-As(2) bond length. In the fourth Na site, Na(4) is bonded in a 4-coordinate geometry to two equivalent Eu(1), one As(1), one As(2), one As(3), and one As(4) atom. There is one shorter (3.46 Å) and one longer (3.70 Å) Na(4)-Eu(1) bond length. The Na(4)-As(1) bond length is 3.18 Å. The Na(4)-As(2) bond length is 3.01 Å. The Na(4)-As(3) bond length is 2.99 Å. The Na(4)-As(4) bond length is 3.05 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 14-coordinate geometry to one Na(2), one Na(3), two equivalent Na(1), two equivalent Na(4), two equivalent Ge(1), one As(2), one As(3), two equivalent As(1), and two equivalent As(4) atoms. There is one shorter (3.30 Å) and one longer (3.64 Å) Eu(1)-Ge(1) bond length. The Eu(1)-As(2) bond length is 3.13 Å. The Eu(1)-As(3) bond length is 3.27 Å. There is one shorter (3.18 Å) and one longer (3.60 Å) Eu(1)-As(1) bond length. There is one shorter (3.12 Å) and one longer (3.28 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 3.11 Å. There is one shorter (3.13 Å) and one longer (3.30 Å) Eu(2)-As(2) bond length. There is one shorter (3.11 Å) and one longer (3.27 Å) Eu(2)-As(3) bond length. Ge(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Eu(1), one As(1), one As(2), one As(3), and one As(4) atom. The Ge(1)-As(1) bond length is 2.54 Å. The Ge(1)-As(2) bond length is 2.49 Å. The Ge(1)-As(3) bond length is 2.52 Å. The Ge(1)-As(4) bond length is 2.46 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 Ge(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(2), two equivalent Eu(1), and one Ge(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 Ge(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 Ge(1) atom.