Sr8MgP4(O4I)4 crystallizes in the triclinic P1 space group. There are eight inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(15), one O(4), one O(5), one O(8), and one I(3) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(14), one O(16), one O(2), one O(3), one O(6), one O(7), one O(9), and one I(4) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(15), one O(2), one O(3), one O(6), one O(7), and one I(1) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(14), one O(16), one O(4), one O(5), one O(8), and one I(2) atom. In the fifth Sr site, Sr(5) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(16), one O(2), one I(2), one I(3), and one I(4) atom. In the sixth Sr site, Sr(6) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(15), one O(7), one O(9), one I(1), and one I(3) atom. In the seventh Sr site, Sr(7) is bonded in a distorted L-shaped geometry to one O(4), one O(9), one I(1), one I(2), and one I(4) atom. In the eighth Sr site, Sr(8) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(3), one O(5), one I(1), one I(2), and one I(3) atom. Mg(1) is bonded in a 2-coordinate geometry to one O(12), one O(14), and one I(3) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(16), and one O(7) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(15), one O(2), one O(8), and one O(9) atom. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(12), one O(14), one O(3), and one O(5) atom. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(11), one O(13), one O(4), and one O(6) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(4), one Sr(6), and one P(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), and one P(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), one Sr(8), and one P(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), one Sr(7), and one P(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(4), one Sr(8), and one P(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(3), and one P(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), one Sr(6), and one P(1) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(4), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), and one P(2) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(5), one Sr(8), and one P(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(5), one Sr(8), and one P(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one Mg(1), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(8), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(6), and one P(2) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(4), one Sr(5), and one P(1) atom. There are four inequivalent I sites. In the first I site, I(1) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one Sr(7), and one Sr(8) atom. In the second I site, I(2) is bonded in a distorted rectangular see-saw-like geometry to one Sr(4), one Sr(5), one Sr(7), and one Sr(8) atom. In the third I site, I(3) is bonded in a distorted trigonal bipyramidal geometry to one Sr(1), one Sr(5), one Sr(6), one Sr(8), and one Mg(1) atom. In the fourth I site, I(4) is bonded in a distorted trigonal non-coplanar geometry to one Sr(2), one Sr(5), and one Sr(7) atom.
Sr8MgP4(O4I)4 crystallizes in the triclinic P1 space group. There are eight inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(15), one O(4), one O(5), one O(8), and one I(3) atom. The Sr(1)-O(1) bond length is 2.68 Å. The Sr(1)-O(10) bond length is 2.88 Å. The Sr(1)-O(13) bond length is 2.57 Å. The Sr(1)-O(15) bond length is 2.76 Å. The Sr(1)-O(4) bond length is 2.89 Å. The Sr(1)-O(5) bond length is 2.54 Å. The Sr(1)-O(8) bond length is 2.69 Å. The Sr(1)-I(3) bond length is 3.61 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(14), one O(16), one O(2), one O(3), one O(6), one O(7), one O(9), and one I(4) atom. The Sr(2)-O(14) bond length is 2.78 Å. The Sr(2)-O(16) bond length is 2.80 Å. The Sr(2)-O(2) bond length is 2.79 Å. The Sr(2)-O(3) bond length is 2.74 Å. The Sr(2)-O(6) bond length is 2.47 Å. The Sr(2)-O(7) bond length is 2.69 Å. The Sr(2)-O(9) bond length is 2.67 Å. The Sr(2)-I(4) bond length is 3.43 Å. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(15), one O(2), one O(3), one O(6), one O(7), and one I(1) atom. The Sr(3)-O(12) bond length is 2.69 Å. The Sr(3)-O(13) bond length is 2.74 Å. The Sr(3)-O(15) bond length is 2.59 Å. The Sr(3)-O(2) bond length is 2.86 Å. The Sr(3)-O(3) bond length is 2.70 Å. The Sr(3)-O(6) bond length is 2.60 Å. The Sr(3)-O(7) bond length is 2.67 Å. The Sr(3)-I(1) bond length is 3.39 Å. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(14), one O(16), one O(4), one O(5), one O(8), and one I(2) atom. The Sr(4)-O(1) bond length is 2.71 Å. The Sr(4)-O(11) bond length is 2.67 Å. The Sr(4)-O(14) bond length is 2.53 Å. The Sr(4)-O(16) bond length is 2.55 Å. The Sr(4)-O(4) bond length is 2.63 Å. The Sr(4)-O(5) bond length is 2.74 Å. The Sr(4)-O(8) bond length is 2.54 Å. The Sr(4)-I(2) bond length is 3.45 Å. In the fifth Sr site, Sr(5) is bonded in a 4-coordinate geometry to one O(10), one O(11), one O(16), one O(2), one I(2), one I(3), and one I(4) atom. The Sr(5)-O(10) bond length is 2.81 Å. The Sr(5)-O(11) bond length is 2.48 Å. The Sr(5)-O(16) bond length is 2.67 Å. The Sr(5)-O(2) bond length is 2.55 Å. The Sr(5)-I(2) bond length is 3.39 Å. The Sr(5)-I(3) bond length is 3.59 Å. The Sr(5)-I(4) bond length is 3.43 Å. In the sixth Sr site, Sr(6) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(15), one O(7), one O(9), one I(1), and one I(3) atom. The Sr(6)-O(1) bond length is 2.55 Å. The Sr(6)-O(12) bond length is 2.45 Å. The Sr(6)-O(15) bond length is 2.62 Å. The Sr(6)-O(7) bond length is 2.83 Å. The Sr(6)-O(9) bond length is 2.65 Å. The Sr(6)-I(1) bond length is 3.33 Å. The Sr(6)-I(3) bond length is 3.46 Å. In the seventh Sr site, Sr(7) is bonded in a distorted L-shaped geometry to one O(4), one O(9), one I(1), one I(2), and one I(4) atom. The Sr(7)-O(4) bond length is 2.48 Å. The Sr(7)-O(9) bond length is 2.58 Å. The Sr(7)-I(1) bond length is 3.34 Å. The Sr(7)-I(2) bond length is 3.42 Å. The Sr(7)-I(4) bond length is 3.36 Å. In the eighth Sr site, Sr(8) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(3), one O(5), one I(1), one I(2), and one I(3) atom. The Sr(8)-O(10) bond length is 2.48 Å. The Sr(8)-O(11) bond length is 2.76 Å. The Sr(8)-O(13) bond length is 2.59 Å. The Sr(8)-O(3) bond length is 2.65 Å. The Sr(8)-O(5) bond length is 2.62 Å. The Sr(8)-I(1) bond length is 3.66 Å. The Sr(8)-I(2) bond length is 3.59 Å. The Sr(8)-I(3) bond length is 3.44 Å. Mg(1) is bonded in a 2-coordinate geometry to one O(12), one O(14), and one I(3) atom. The Mg(1)-O(12) bond length is 2.45 Å. The Mg(1)-O(14) bond length is 2.22 Å. The Mg(1)-I(3) bond length is 3.32 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(16), and one O(7) atom. The P(1)-O(1) bond length is 1.58 Å. The P(1)-O(10) bond length is 1.55 Å. The P(1)-O(16) bond length is 1.57 Å. The P(1)-O(7) bond length is 1.55 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(15), one O(2), one O(8), and one O(9) atom. The P(2)-O(15) bond length is 1.56 Å. The P(2)-O(2) bond length is 1.56 Å. The P(2)-O(8) bond length is 1.55 Å. The P(2)-O(9) bond length is 1.56 Å. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(12), one O(14), one O(3), and one O(5) atom. The P(3)-O(12) bond length is 1.55 Å. The P(3)-O(14) bond length is 1.57 Å. The P(3)-O(3) bond length is 1.55 Å. The P(3)-O(5) bond length is 1.55 Å. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(11), one O(13), one O(4), and one O(6) atom. The P(4)-O(11) bond length is 1.57 Å. The P(4)-O(13) bond length is 1.57 Å. The P(4)-O(4) bond length is 1.57 Å. The P(4)-O(6) bond length is 1.54 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(4), one Sr(6), and one P(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), and one P(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), one Sr(8), and one P(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), one Sr(7), and one P(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(4), one Sr(8), and one P(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(3), and one P(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), one Sr(6), and one P(1) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(4), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), and one P(2) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(5), one Sr(8), and one P(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(5), one Sr(8), and one P(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one Mg(1), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(8), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(6), and one P(2) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(4), one Sr(5), and one P(1) atom. There are four inequivalent I sites. In the first I site, I(1) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one Sr(7), and one Sr(8) atom. In the second I site, I(2) is bonded in a distorted rectangular see-saw-like geometry to one Sr(4), one Sr(5), one Sr(7), and one Sr(8) atom. In the third I site, I(3) is bonded in a distorted trigonal bipyramidal geometry to one Sr(1), one Sr(5), one Sr(6), one Sr(8), and one Mg(1) atom. In the fourth I site, I(4) is bonded in a distorted trigonal non-coplanar geometry to one Sr(2), one Sr(5), and one Sr(7) atom.