Na4Sr2TiAs4 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 6-coordinate geometry to one Ti(1), one As(1), one As(2), one As(4), and two equivalent As(3) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one As(3), one As(4), and two equivalent As(2) atoms. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one As(3), one As(4), and two equivalent As(1) 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 Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to one As(1), one As(2), one As(4), and two equivalent As(3) atoms. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one As(4), two equivalent As(1), and two equivalent As(2) atoms. Ti(1) is bonded in a distorted tetrahedral geometry to one Na(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 7-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Sr(1), one Sr(2), and one Ti(1) atom. In the second As site, As(1) is bonded in a 8-coordinate geometry to one Na(1), one Na(4), two equivalent Na(3), one Sr(1), two equivalent Sr(2), and one Ti(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(2), one Sr(1), two equivalent Sr(2), and one Ti(1) atom. In the fourth As site, As(3) is bonded in a 8-coordinate geometry to one Na(2), one Na(3), one Na(4), two equivalent Na(1), two equivalent Sr(1), and one Ti(1) atom.
Na4Sr2TiAs4 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 6-coordinate geometry to one Ti(1), one As(1), one As(2), one As(4), and two equivalent As(3) atoms. The Na(1)-Ti(1) bond length is 3.33 Å. The Na(1)-As(1) bond length is 3.41 Å. The Na(1)-As(2) bond length is 3.20 Å. The Na(1)-As(4) bond length is 3.17 Å. There is one shorter (3.18 Å) and one longer (3.36 Å) Na(1)-As(3) bond length. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one As(3), one As(4), and two equivalent As(2) atoms. The Na(2)-As(3) bond length is 2.96 Å. The Na(2)-As(4) bond length is 3.28 Å. There is one shorter (3.00 Å) and one longer (3.09 Å) Na(2)-As(2) bond length. In the third Na site, Na(3) is bonded in a 4-coordinate geometry to one As(3), one As(4), and two equivalent As(1) atoms. The Na(3)-As(3) bond length is 2.94 Å. The Na(3)-As(4) bond length is 3.27 Å. There is one shorter (3.04 Å) and one longer (3.06 Å) Na(3)-As(1) 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 3.05 Å. The Na(4)-As(2) bond length is 2.97 Å. The Na(4)-As(3) bond length is 3.04 Å. The Na(4)-As(4) bond length is 3.31 Å. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to one As(1), one As(2), one As(4), and two equivalent As(3) atoms. The Sr(1)-As(1) bond length is 3.23 Å. The Sr(1)-As(2) bond length is 3.29 Å. The Sr(1)-As(4) bond length is 3.19 Å. There is one shorter (3.18 Å) and one longer (3.34 Å) Sr(1)-As(3) bond length. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one As(4), two equivalent As(1), and two equivalent As(2) atoms. The Sr(2)-As(4) bond length is 3.13 Å. There is one shorter (3.20 Å) and one longer (3.38 Å) Sr(2)-As(1) bond length. There is one shorter (3.16 Å) and one longer (3.28 Å) Sr(2)-As(2) bond length. Ti(1) is bonded in a distorted tetrahedral geometry to one Na(1), one As(1), one As(2), one As(3), and one As(4) atom. The Ti(1)-As(1) bond length is 2.48 Å. The Ti(1)-As(2) bond length is 2.52 Å. The Ti(1)-As(3) bond length is 2.47 Å. The Ti(1)-As(4) bond length is 2.49 Å. There are four inequivalent As sites. In the first As site, As(4) is bonded in a 7-coordinate geometry to one Na(1), one Na(2), one Na(3), one Na(4), one Sr(1), one Sr(2), and one Ti(1) atom. In the second As site, As(1) is bonded in a 8-coordinate geometry to one Na(1), one Na(4), two equivalent Na(3), one Sr(1), two equivalent Sr(2), and one Ti(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(2), one Sr(1), two equivalent Sr(2), and one Ti(1) atom. In the fourth As site, As(3) is bonded in a 8-coordinate geometry to one Na(2), one Na(3), one Na(4), two equivalent Na(1), two equivalent Sr(1), and one Ti(1) atom.