BaSrSi4(NO)4 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one N(5), one O(1), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one N(6), one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one N(3), one O(1), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(7), and one O(8) atom. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(2), one N(4), and one O(7) atom to form corner-sharing SiN3O tetrahedra. In the second Si site, Si(2) is bonded to one N(3), one N(4), one N(5), and one O(5) atom to form corner-sharing SiN3O tetrahedra. In the third Si site, Si(3) is bonded to one N(1), one N(5), one N(6), and one O(1) atom to form corner-sharing SiN3O tetrahedra. In the fourth Si site, Si(4) is bonded to one N(4), one N(6), one N(7), and one O(2) atom to form corner-sharing SiN3O tetrahedra. In the fifth Si site, Si(5) is bonded to one N(1), one N(3), one N(8), and one O(3) atom to form corner-sharing SiN3O tetrahedra. In the sixth Si site, Si(6) is bonded to one N(2), one N(6), one N(8), and one O(8) atom to form corner-sharing SiN3O tetrahedra. In the seventh Si site, Si(7) is bonded to one N(5), one N(7), one N(8), and one O(6) atom to form corner-sharing SiN3O tetrahedra. In the eighth Si site, Si(8) is bonded to one N(2), one N(3), one N(7), and one O(4) atom to form corner-sharing SiN3O tetrahedra. There are eight inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Si(1), one Si(3), and one Si(5) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Si(1), one Si(6), and one Si(8) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Si(2), one Si(5), and one Si(8) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Si(1), one Si(2), and one Si(4) atom. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one Ba(1), one Si(2), one Si(3), and one Si(7) atom. In the sixth N site, N(6) is bonded in a distorted trigonal planar geometry to one Ba(2), one Si(3), one Si(4), and one Si(6) atom. In the seventh N site, N(7) is bonded in a trigonal planar geometry to one Si(4), one Si(7), and one Si(8) atom. In the eighth N site, N(8) is bonded in a trigonal planar geometry to one Si(5), one Si(6), and one Si(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(2), one Sr(1), one Sr(2), and one Si(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ba(2), one Sr(2), and one Si(4) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(1), one Sr(1), and one Si(5) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), one Sr(1), one Sr(2), and one Si(8) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Ba(1), one Ba(2), one Sr(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Sr(1), and one Si(7) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ba(2), one Sr(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one Ba(1), one Ba(2), one Sr(1), one Sr(2), and one Si(6) atom.
BaSrSi4(NO)4 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one N(5), one O(1), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. The Ba(1)-N(5) bond length is 3.15 Å. The Ba(1)-O(1) bond length is 2.78 Å. The Ba(1)-O(3) bond length is 2.55 Å. The Ba(1)-O(4) bond length is 2.72 Å. The Ba(1)-O(5) bond length is 2.84 Å. The Ba(1)-O(6) bond length is 2.55 Å. The Ba(1)-O(8) bond length is 3.26 Å. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one N(6), one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. The Ba(2)-N(6) bond length is 2.96 Å. The Ba(2)-O(1) bond length is 2.92 Å. The Ba(2)-O(2) bond length is 2.59 Å. The Ba(2)-O(4) bond length is 2.94 Å. The Ba(2)-O(5) bond length is 2.68 Å. The Ba(2)-O(7) bond length is 2.56 Å. The Ba(2)-O(8) bond length is 2.73 Å. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one N(3), one O(1), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. The Sr(1)-N(3) bond length is 2.98 Å. The Sr(1)-O(1) bond length is 2.85 Å. The Sr(1)-O(3) bond length is 2.45 Å. The Sr(1)-O(4) bond length is 2.84 Å. The Sr(1)-O(5) bond length is 2.57 Å. The Sr(1)-O(6) bond length is 2.49 Å. The Sr(1)-O(8) bond length is 2.54 Å. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(7), and one O(8) atom. The Sr(2)-O(1) bond length is 2.62 Å. The Sr(2)-O(2) bond length is 2.42 Å. The Sr(2)-O(4) bond length is 2.65 Å. The Sr(2)-O(7) bond length is 2.44 Å. The Sr(2)-O(8) bond length is 2.63 Å. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(2), one N(4), and one O(7) atom to form corner-sharing SiN3O tetrahedra. The Si(1)-N(1) bond length is 1.75 Å. The Si(1)-N(2) bond length is 1.77 Å. The Si(1)-N(4) bond length is 1.77 Å. The Si(1)-O(7) bond length is 1.61 Å. In the second Si site, Si(2) is bonded to one N(3), one N(4), one N(5), and one O(5) atom to form corner-sharing SiN3O tetrahedra. The Si(2)-N(3) bond length is 1.77 Å. The Si(2)-N(4) bond length is 1.75 Å. The Si(2)-N(5) bond length is 1.76 Å. The Si(2)-O(5) bond length is 1.65 Å. In the third Si site, Si(3) is bonded to one N(1), one N(5), one N(6), and one O(1) atom to form corner-sharing SiN3O tetrahedra. The Si(3)-N(1) bond length is 1.73 Å. The Si(3)-N(5) bond length is 1.77 Å. The Si(3)-N(6) bond length is 1.77 Å. The Si(3)-O(1) bond length is 1.65 Å. In the fourth Si site, Si(4) is bonded to one N(4), one N(6), one N(7), and one O(2) atom to form corner-sharing SiN3O tetrahedra. The Si(4)-N(4) bond length is 1.77 Å. The Si(4)-N(6) bond length is 1.77 Å. The Si(4)-N(7) bond length is 1.77 Å. The Si(4)-O(2) bond length is 1.61 Å. In the fifth Si site, Si(5) is bonded to one N(1), one N(3), one N(8), and one O(3) atom to form corner-sharing SiN3O tetrahedra. The Si(5)-N(1) bond length is 1.76 Å. The Si(5)-N(3) bond length is 1.77 Å. The Si(5)-N(8) bond length is 1.75 Å. The Si(5)-O(3) bond length is 1.61 Å. In the sixth Si site, Si(6) is bonded to one N(2), one N(6), one N(8), and one O(8) atom to form corner-sharing SiN3O tetrahedra. The Si(6)-N(2) bond length is 1.75 Å. The Si(6)-N(6) bond length is 1.77 Å. The Si(6)-N(8) bond length is 1.73 Å. The Si(6)-O(8) bond length is 1.65 Å. In the seventh Si site, Si(7) is bonded to one N(5), one N(7), one N(8), and one O(6) atom to form corner-sharing SiN3O tetrahedra. The Si(7)-N(5) bond length is 1.78 Å. The Si(7)-N(7) bond length is 1.77 Å. The Si(7)-N(8) bond length is 1.75 Å. The Si(7)-O(6) bond length is 1.61 Å. In the eighth Si site, Si(8) is bonded to one N(2), one N(3), one N(7), and one O(4) atom to form corner-sharing SiN3O tetrahedra. The Si(8)-N(2) bond length is 1.75 Å. The Si(8)-N(3) bond length is 1.77 Å. The Si(8)-N(7) bond length is 1.74 Å. The Si(8)-O(4) bond length is 1.65 Å. There are eight inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Si(1), one Si(3), and one Si(5) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Si(1), one Si(6), and one Si(8) atom. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Sr(1), one Si(2), one Si(5), and one Si(8) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Si(1), one Si(2), and one Si(4) atom. In the fifth N site, N(5) is bonded in a trigonal planar geometry to one Ba(1), one Si(2), one Si(3), and one Si(7) atom. In the sixth N site, N(6) is bonded in a distorted trigonal planar geometry to one Ba(2), one Si(3), one Si(4), and one Si(6) atom. In the seventh N site, N(7) is bonded in a trigonal planar geometry to one Si(4), one Si(7), and one Si(8) atom. In the eighth N site, N(8) is bonded in a trigonal planar geometry to one Si(5), one Si(6), and one Si(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(2), one Sr(1), one Sr(2), and one Si(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ba(2), one Sr(2), and one Si(4) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(1), one Sr(1), and one Si(5) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), one Sr(1), one Sr(2), and one Si(8) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Ba(1), one Ba(2), one Sr(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Sr(1), and one Si(7) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ba(2), one Sr(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one Ba(1), one Ba(2), one Sr(1), one Sr(2), and one Si(6) atom.