Sr2Ru7B8 crystallizes in the tetragonal P4_2/m space group. Sr(1) is bonded in a 22-coordinate geometry to one Sr(1), two equivalent Ru(3), three equivalent Ru(2), six equivalent Ru(1), two equivalent B(1), two equivalent B(3), and six equivalent B(2) atoms. There are three inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a 9-coordinate geometry to three equivalent Sr(1), one B(1), two equivalent B(3), and three equivalent B(2) atoms. In the second Ru site, Ru(2) is bonded in a 6-coordinate geometry to three equivalent Sr(1), two equivalent B(1), two equivalent B(2), and two equivalent B(3) atoms. In the third Ru site, Ru(3) is bonded in a 4-coordinate geometry to four equivalent Sr(1) and four equivalent B(2) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 7-coordinate geometry to two equivalent Sr(1), two equivalent Ru(1), two equivalent Ru(2), one B(1), and two equivalent B(2) atoms. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Sr(1), one Ru(2), one Ru(3), three equivalent Ru(1), and one B(1) atom. In the third B site, B(3) is bonded in a 7-coordinate geometry to two equivalent Sr(1), two equivalent Ru(2), four equivalent Ru(1), and one B(3) atom.
Sr2Ru7B8 crystallizes in the tetragonal P4_2/m space group. Sr(1) is bonded in a 22-coordinate geometry to one Sr(1), two equivalent Ru(3), three equivalent Ru(2), six equivalent Ru(1), two equivalent B(1), two equivalent B(3), and six equivalent B(2) atoms. The Sr(1)-Sr(1) bond length is 3.30 Å. Both Sr(1)-Ru(3) bond lengths are 3.16 Å. There are a spread of Sr(1)-Ru(2) bond distances ranging from 3.13-3.44 Å. There are a spread of Sr(1)-Ru(1) bond distances ranging from 3.11-3.45 Å. Both Sr(1)-B(1) bond lengths are 3.18 Å. Both Sr(1)-B(3) bond lengths are 3.34 Å. There are a spread of Sr(1)-B(2) bond distances ranging from 3.14-3.36 Å. There are three inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a 9-coordinate geometry to three equivalent Sr(1), one B(1), two equivalent B(3), and three equivalent B(2) atoms. The Ru(1)-B(1) bond length is 2.17 Å. There is one shorter (2.19 Å) and one longer (2.24 Å) Ru(1)-B(3) bond length. There are a spread of Ru(1)-B(2) bond distances ranging from 2.12-2.35 Å. In the second Ru site, Ru(2) is bonded in a 6-coordinate geometry to three equivalent Sr(1), two equivalent B(1), two equivalent B(2), and two equivalent B(3) atoms. Both Ru(2)-B(1) bond lengths are 2.14 Å. Both Ru(2)-B(2) bond lengths are 2.26 Å. Both Ru(2)-B(3) bond lengths are 2.21 Å. In the third Ru site, Ru(3) is bonded in a 4-coordinate geometry to four equivalent Sr(1) and four equivalent B(2) atoms. All Ru(3)-B(2) bond lengths are 2.06 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded in a 7-coordinate geometry to two equivalent Sr(1), two equivalent Ru(1), two equivalent Ru(2), one B(1), and two equivalent B(2) atoms. The B(1)-B(1) bond length is 1.80 Å. Both B(1)-B(2) bond lengths are 1.79 Å. In the second B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Sr(1), one Ru(2), one Ru(3), three equivalent Ru(1), and one B(1) atom. In the third B site, B(3) is bonded in a 7-coordinate geometry to two equivalent Sr(1), two equivalent Ru(2), four equivalent Ru(1), and one B(3) atom. The B(3)-B(3) bond length is 1.86 Å.