Ca7(Rh10B7)2 crystallizes in the orthorhombic Fmmm space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 20-coordinate geometry to one Ca(2), one Ca(4), two equivalent Rh(2), two equivalent Rh(4), four equivalent Rh(1), four equivalent Rh(5), and six equivalent B(2) atoms. In the second Ca site, Ca(2) is bonded in a 17-coordinate geometry to one Ca(1), two equivalent Rh(4), four equivalent Rh(1), four equivalent Rh(7), and six equivalent B(3) atoms. In the third Ca site, Ca(3) is bonded in a 20-coordinate geometry to two equivalent Ca(4), four equivalent Rh(6), eight equivalent Rh(3), and six equivalent B(4) atoms. In the fourth Ca site, Ca(4) is bonded in a 20-coordinate geometry to one Ca(1), one Ca(3), two equivalent Rh(2), two equivalent Rh(6), four equivalent Rh(3), four equivalent Rh(5), and six equivalent B(1) atoms. There are seven inequivalent Rh sites. In the first Rh site, Rh(7) is bonded in a 4-coordinate geometry to four equivalent Ca(2) and four equivalent B(3) atoms. In the second Rh site, Rh(1) is bonded in a distorted square co-planar geometry to two equivalent Ca(1), two equivalent Ca(2), two equivalent B(2), and two equivalent B(3) atoms. In the third Rh site, Rh(2) is bonded in a distorted square co-planar geometry to two equivalent Ca(1), two equivalent Ca(4), two equivalent B(1), and two equivalent B(2) atoms. In the fourth Rh site, Rh(3) is bonded in a distorted square co-planar geometry to two equivalent Ca(3), two equivalent Ca(4), two equivalent B(1), and two equivalent B(4) atoms. In the fifth Rh site, Rh(4) is bonded in a distorted square co-planar geometry to two equivalent Ca(1), two equivalent Ca(2), two equivalent B(2), and two equivalent B(3) atoms. In the sixth Rh site, Rh(5) is bonded in a distorted square co-planar geometry to two equivalent Ca(1), two equivalent Ca(4), two equivalent B(1), and two equivalent B(2) atoms. In the seventh Rh site, Rh(6) is bonded in a distorted square co-planar geometry to two equivalent Ca(3), two equivalent Ca(4), two equivalent B(1), and two equivalent B(4) atoms. There are four inequivalent B sites. In the first B site, B(3) is bonded in a 5-coordinate geometry to three equivalent Ca(2), one Rh(4), two equivalent Rh(1), and two equivalent Rh(7) atoms. In the second B site, B(4) is bonded in a 6-coordinate geometry to three equivalent Ca(3), two equivalent Rh(6), and four equivalent Rh(3) atoms. In the third B site, B(1) is bonded in a 6-coordinate geometry to three equivalent Ca(4), one Rh(2), one Rh(6), two equivalent Rh(3), and two equivalent Rh(5) atoms. In the fourth B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Ca(1), one Rh(2), one Rh(4), two equivalent Rh(1), and two equivalent Rh(5) atoms.
Ca7(Rh10B7)2 crystallizes in the orthorhombic Fmmm space group. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 20-coordinate geometry to one Ca(2), one Ca(4), two equivalent Rh(2), two equivalent Rh(4), four equivalent Rh(1), four equivalent Rh(5), and six equivalent B(2) atoms. The Ca(1)-Ca(2) bond length is 3.07 Å. The Ca(1)-Ca(4) bond length is 2.99 Å. Both Ca(1)-Rh(2) bond lengths are 3.20 Å. Both Ca(1)-Rh(4) bond lengths are 3.12 Å. All Ca(1)-Rh(1) bond lengths are 3.13 Å. All Ca(1)-Rh(5) bond lengths are 3.21 Å. There are four shorter (3.24 Å) and two longer (3.25 Å) Ca(1)-B(2) bond lengths. In the second Ca site, Ca(2) is bonded in a 17-coordinate geometry to one Ca(1), two equivalent Rh(4), four equivalent Rh(1), four equivalent Rh(7), and six equivalent B(3) atoms. Both Ca(2)-Rh(4) bond lengths are 3.26 Å. All Ca(2)-Rh(1) bond lengths are 3.29 Å. All Ca(2)-Rh(7) bond lengths are 3.03 Å. There are two shorter (2.95 Å) and four longer (3.22 Å) Ca(2)-B(3) bond lengths. In the third Ca site, Ca(3) is bonded in a 20-coordinate geometry to two equivalent Ca(4), four equivalent Rh(6), eight equivalent Rh(3), and six equivalent B(4) atoms. Both Ca(3)-Ca(4) bond lengths are 2.96 Å. All Ca(3)-Rh(6) bond lengths are 3.16 Å. All Ca(3)-Rh(3) bond lengths are 3.17 Å. There are four shorter (3.23 Å) and two longer (3.26 Å) Ca(3)-B(4) bond lengths. In the fourth Ca site, Ca(4) is bonded in a 20-coordinate geometry to one Ca(1), one Ca(3), two equivalent Rh(2), two equivalent Rh(6), four equivalent Rh(3), four equivalent Rh(5), and six equivalent B(1) atoms. Both Ca(4)-Rh(2) bond lengths are 3.14 Å. Both Ca(4)-Rh(6) bond lengths are 3.17 Å. All Ca(4)-Rh(3) bond lengths are 3.19 Å. All Ca(4)-Rh(5) bond lengths are 3.16 Å. There are four shorter (3.23 Å) and two longer (3.25 Å) Ca(4)-B(1) bond lengths. There are seven inequivalent Rh sites. In the first Rh site, Rh(7) is bonded in a 4-coordinate geometry to four equivalent Ca(2) and four equivalent B(3) atoms. All Rh(7)-B(3) bond lengths are 2.13 Å. In the second Rh site, Rh(1) is bonded in a distorted square co-planar geometry to two equivalent Ca(1), two equivalent Ca(2), two equivalent B(2), and two equivalent B(3) atoms. Both Rh(1)-B(2) bond lengths are 2.18 Å. Both Rh(1)-B(3) bond lengths are 2.21 Å. In the third Rh site, Rh(2) is bonded in a distorted square co-planar geometry to two equivalent Ca(1), two equivalent Ca(4), two equivalent B(1), and two equivalent B(2) atoms. Both Rh(2)-B(1) bond lengths are 2.18 Å. Both Rh(2)-B(2) bond lengths are 2.19 Å. In the fourth Rh site, Rh(3) is bonded in a distorted square co-planar geometry to two equivalent Ca(3), two equivalent Ca(4), two equivalent B(1), and two equivalent B(4) atoms. Both Rh(3)-B(1) bond lengths are 2.19 Å. Both Rh(3)-B(4) bond lengths are 2.18 Å. In the fifth Rh site, Rh(4) is bonded in a distorted square co-planar geometry to two equivalent Ca(1), two equivalent Ca(2), two equivalent B(2), and two equivalent B(3) atoms. Both Rh(4)-B(2) bond lengths are 2.20 Å. Both Rh(4)-B(3) bond lengths are 2.14 Å. In the sixth Rh site, Rh(5) is bonded in a distorted square co-planar geometry to two equivalent Ca(1), two equivalent Ca(4), two equivalent B(1), and two equivalent B(2) atoms. Both Rh(5)-B(1) bond lengths are 2.18 Å. Both Rh(5)-B(2) bond lengths are 2.18 Å. In the seventh Rh site, Rh(6) is bonded in a distorted square co-planar geometry to two equivalent Ca(3), two equivalent Ca(4), two equivalent B(1), and two equivalent B(4) atoms. Both Rh(6)-B(1) bond lengths are 2.19 Å. Both Rh(6)-B(4) bond lengths are 2.18 Å. There are four inequivalent B sites. In the first B site, B(3) is bonded in a 5-coordinate geometry to three equivalent Ca(2), one Rh(4), two equivalent Rh(1), and two equivalent Rh(7) atoms. In the second B site, B(4) is bonded in a 6-coordinate geometry to three equivalent Ca(3), two equivalent Rh(6), and four equivalent Rh(3) atoms. In the third B site, B(1) is bonded in a 6-coordinate geometry to three equivalent Ca(4), one Rh(2), one Rh(6), two equivalent Rh(3), and two equivalent Rh(5) atoms. In the fourth B site, B(2) is bonded in a 6-coordinate geometry to three equivalent Ca(1), one Rh(2), one Rh(4), two equivalent Rh(1), and two equivalent Rh(5) atoms.