Al13Rh4 crystallizes in the monoclinic C2/m space group. There are five inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 11-coordinate geometry to one Al(1), one Al(3), one Al(9), two equivalent Al(12), two equivalent Al(13), two equivalent Al(14), and two equivalent Al(4) atoms. In the second Rh site, Rh(2) is bonded in a 10-coordinate geometry to one Al(3), one Al(6), one Al(7), one Al(8), two equivalent Al(12), two equivalent Al(13), and two equivalent Al(14) atoms. In the third Rh site, Rh(3) is bonded in a 10-coordinate geometry to one Al(5), one Al(9), two equivalent Al(1), two equivalent Al(10), two equivalent Al(11), and two equivalent Al(15) atoms. In the fourth Rh site, Rh(4) is bonded in a 10-coordinate geometry to one Al(5), one Al(8), two equivalent Al(10), two equivalent Al(11), two equivalent Al(15), and two equivalent Al(6) atoms. In the fifth Rh site, Rh(5) is bonded in a 9-coordinate geometry to one Al(10), one Al(11), one Al(12), one Al(13), one Al(14), one Al(2), one Al(4), one Al(8), and one Al(9) atom. There are fifteen inequivalent Al sites. In the first Al site, Al(1) is bonded in a 3-coordinate geometry to one Rh(1) and two equivalent Rh(3) atoms. In the second Al site, Al(2) is bonded in a linear geometry to two equivalent Rh(5) atoms. In the third Al site, Al(3) is bonded in a distorted linear geometry to one Rh(1) and one Rh(2) atom. In the fourth Al site, Al(4) is bonded in a 4-coordinate geometry to two equivalent Rh(1) and two equivalent Rh(5) atoms. In the fifth Al site, Al(5) is bonded in a linear geometry to one Rh(3) and one Rh(4) atom. In the sixth Al site, Al(6) is bonded in a 3-coordinate geometry to one Rh(2) and two equivalent Rh(4) atoms. In the seventh Al site, Al(7) is bonded in a distorted linear geometry to two equivalent Rh(2) atoms. In the eighth Al site, Al(8) is bonded in a 4-coordinate geometry to one Rh(2), one Rh(4), and two equivalent Rh(5) atoms. In the ninth Al site, Al(9) is bonded in a 3-coordinate geometry to one Rh(1), one Rh(3), and two equivalent Rh(5) atoms. In the tenth Al site, Al(10) is bonded in a 3-coordinate geometry to one Rh(3), one Rh(4), and one Rh(5) atom. In the eleventh Al site, Al(11) is bonded in a 3-coordinate geometry to one Rh(3), one Rh(4), and one Rh(5) atom. In the twelfth Al site, Al(12) is bonded in a 3-coordinate geometry to one Rh(1), one Rh(2), and one Rh(5) atom. In the thirteenth Al site, Al(13) is bonded in a 3-coordinate geometry to one Rh(1), one Rh(2), and one Rh(5) atom. In the fourteenth Al site, Al(14) is bonded in a 2-coordinate geometry to one Rh(1), one Rh(2), and one Rh(5) atom. In the fifteenth Al site, Al(15) is bonded in a 4-coordinate geometry to two equivalent Rh(3) and two equivalent Rh(4) atoms.
Al13Rh4 crystallizes in the monoclinic C2/m space group. There are five inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 11-coordinate geometry to one Al(1), one Al(3), one Al(9), two equivalent Al(12), two equivalent Al(13), two equivalent Al(14), and two equivalent Al(4) atoms. The Rh(1)-Al(1) bond length is 2.66 Å. The Rh(1)-Al(3) bond length is 2.53 Å. The Rh(1)-Al(9) bond length is 2.87 Å. Both Rh(1)-Al(12) bond lengths are 2.60 Å. Both Rh(1)-Al(13) bond lengths are 2.65 Å. Both Rh(1)-Al(14) bond lengths are 2.87 Å. There is one shorter (2.55 Å) and one longer (2.65 Å) Rh(1)-Al(4) bond length. In the second Rh site, Rh(2) is bonded in a 10-coordinate geometry to one Al(3), one Al(6), one Al(7), one Al(8), two equivalent Al(12), two equivalent Al(13), and two equivalent Al(14) atoms. The Rh(2)-Al(3) bond length is 2.47 Å. The Rh(2)-Al(6) bond length is 2.54 Å. The Rh(2)-Al(7) bond length is 2.64 Å. The Rh(2)-Al(8) bond length is 2.73 Å. Both Rh(2)-Al(12) bond lengths are 2.76 Å. Both Rh(2)-Al(13) bond lengths are 2.53 Å. Both Rh(2)-Al(14) bond lengths are 2.57 Å. In the third Rh site, Rh(3) is bonded in a 10-coordinate geometry to one Al(5), one Al(9), two equivalent Al(1), two equivalent Al(10), two equivalent Al(11), and two equivalent Al(15) atoms. The Rh(3)-Al(5) bond length is 2.43 Å. The Rh(3)-Al(9) bond length is 2.49 Å. There is one shorter (2.65 Å) and one longer (2.70 Å) Rh(3)-Al(1) bond length. Both Rh(3)-Al(10) bond lengths are 2.63 Å. Both Rh(3)-Al(11) bond lengths are 2.80 Å. Both Rh(3)-Al(15) bond lengths are 2.57 Å. In the fourth Rh site, Rh(4) is bonded in a 10-coordinate geometry to one Al(5), one Al(8), two equivalent Al(10), two equivalent Al(11), two equivalent Al(15), and two equivalent Al(6) atoms. The Rh(4)-Al(5) bond length is 2.42 Å. The Rh(4)-Al(8) bond length is 2.65 Å. Both Rh(4)-Al(10) bond lengths are 2.76 Å. Both Rh(4)-Al(11) bond lengths are 2.62 Å. Both Rh(4)-Al(15) bond lengths are 2.59 Å. There is one shorter (2.60 Å) and one longer (2.63 Å) Rh(4)-Al(6) bond length. In the fifth Rh site, Rh(5) is bonded in a 9-coordinate geometry to one Al(10), one Al(11), one Al(12), one Al(13), one Al(14), one Al(2), one Al(4), one Al(8), and one Al(9) atom. The Rh(5)-Al(10) bond length is 2.60 Å. The Rh(5)-Al(11) bond length is 2.59 Å. The Rh(5)-Al(12) bond length is 2.61 Å. The Rh(5)-Al(13) bond length is 2.57 Å. The Rh(5)-Al(14) bond length is 2.52 Å. The Rh(5)-Al(2) bond length is 2.37 Å. The Rh(5)-Al(4) bond length is 2.68 Å. The Rh(5)-Al(8) bond length is 2.57 Å. The Rh(5)-Al(9) bond length is 2.60 Å. There are fifteen inequivalent Al sites. In the first Al site, Al(1) is bonded in a 3-coordinate geometry to one Rh(1) and two equivalent Rh(3) atoms. In the second Al site, Al(2) is bonded in a linear geometry to two equivalent Rh(5) atoms. In the third Al site, Al(3) is bonded in a distorted linear geometry to one Rh(1) and one Rh(2) atom. In the fourth Al site, Al(4) is bonded in a 4-coordinate geometry to two equivalent Rh(1) and two equivalent Rh(5) atoms. In the fifth Al site, Al(5) is bonded in a linear geometry to one Rh(3) and one Rh(4) atom. In the sixth Al site, Al(6) is bonded in a 3-coordinate geometry to one Rh(2) and two equivalent Rh(4) atoms. In the seventh Al site, Al(7) is bonded in a distorted linear geometry to two equivalent Rh(2) atoms. In the eighth Al site, Al(8) is bonded in a 4-coordinate geometry to one Rh(2), one Rh(4), and two equivalent Rh(5) atoms. In the ninth Al site, Al(9) is bonded in a 3-coordinate geometry to one Rh(1), one Rh(3), and two equivalent Rh(5) atoms. In the tenth Al site, Al(10) is bonded in a 3-coordinate geometry to one Rh(3), one Rh(4), and one Rh(5) atom. In the eleventh Al site, Al(11) is bonded in a 3-coordinate geometry to one Rh(3), one Rh(4), and one Rh(5) atom. In the twelfth Al site, Al(12) is bonded in a 3-coordinate geometry to one Rh(1), one Rh(2), and one Rh(5) atom. In the thirteenth Al site, Al(13) is bonded in a 3-coordinate geometry to one Rh(1), one Rh(2), and one Rh(5) atom. In the fourteenth Al site, Al(14) is bonded in a 2-coordinate geometry to one Rh(1), one Rh(2), and one Rh(5) atom. In the fifteenth Al site, Al(15) is bonded in a 4-coordinate geometry to two equivalent Rh(3) and two equivalent Rh(4) atoms.