Rh20Si13 crystallizes in the trigonal P-3 space group. There are four inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. In the second Rh site, Rh(2) is bonded to one Si(2) and three equivalent Si(3) atoms to form a mixture of distorted corner and edge-sharing RhSi4 tetrahedra. In the third Rh site, Rh(3) is bonded in a 5-coordinate geometry to two equivalent Si(1) and three equivalent Si(3) atoms. In the fourth Rh site, Rh(4) is bonded in a 5-coordinate geometry to two equivalent Si(3) and three equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to two equivalent Rh(1), two equivalent Rh(3), and three equivalent Rh(4) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to six equivalent Rh(2) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to two equivalent Rh(4), three equivalent Rh(2), and three equivalent Rh(3) atoms.
Rh20Si13 crystallizes in the trigonal P-3 space group. There are four inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. All Rh(1)-Si(1) bond lengths are 2.55 Å. In the second Rh site, Rh(2) is bonded to one Si(2) and three equivalent Si(3) atoms to form a mixture of distorted corner and edge-sharing RhSi4 tetrahedra. The Rh(2)-Si(2) bond length is 2.41 Å. There are a spread of Rh(2)-Si(3) bond distances ranging from 2.41-2.48 Å. In the third Rh site, Rh(3) is bonded in a 5-coordinate geometry to two equivalent Si(1) and three equivalent Si(3) atoms. There is one shorter (2.43 Å) and one longer (2.44 Å) Rh(3)-Si(1) bond length. There are two shorter (2.50 Å) and one longer (2.53 Å) Rh(3)-Si(3) bond length. In the fourth Rh site, Rh(4) is bonded in a 5-coordinate geometry to two equivalent Si(3) and three equivalent Si(1) atoms. There is one shorter (2.51 Å) and one longer (2.52 Å) Rh(4)-Si(3) bond length. There are a spread of Rh(4)-Si(1) bond distances ranging from 2.43-2.51 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 7-coordinate geometry to two equivalent Rh(1), two equivalent Rh(3), and three equivalent Rh(4) atoms. In the second Si site, Si(2) is bonded in a 6-coordinate geometry to six equivalent Rh(2) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to two equivalent Rh(4), three equivalent Rh(2), and three equivalent Rh(3) atoms.