Ta4(RhPd3)3 is beta Cu3Ti-derived structured and crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to six Rh(1,1) and six Pd(2,2) atoms to form TaPd6Rh6 cuboctahedra that share corners with six equivalent Ta(2)Pd12 cuboctahedra; corners with six equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with six equivalent Pd(1)Ta4Pd8 cuboctahedra; edges with twelve Pd(2,2)Ta4Pd6Rh2 cuboctahedra; faces with six equivalent Ta(3)Pd9Rh3 cuboctahedra; and faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra. In the second Ta site, Ta(2) is bonded to six equivalent Pd(1) and six Pd(2,2) atoms to form TaPd12 cuboctahedra that share corners with six equivalent Ta(2)Pd12 cuboctahedra; corners with six equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with six equivalent Pd(1)Ta4Pd8 cuboctahedra; edges with twelve Pd(2,2)Ta4Pd6Rh2 cuboctahedra; faces with six equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra; and faces with six equivalent Pd(1)Ta4Pd8 cuboctahedra. In the third Ta site, Ta(3) is bonded to three Rh(1,1); three equivalent Pd(1); and six Pd(2,2) atoms to form TaPd9Rh3 cuboctahedra that share corners with six equivalent Ta(3)Pd9Rh3 cuboctahedra; corners with twelve Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with six equivalent Pd(1)Ta4Pd8 cuboctahedra; faces with two equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with three equivalent Ta(2)Pd12 cuboctahedra; faces with three equivalent Ta(1)Pd6Rh6 cuboctahedra; faces with three equivalent Pd(1)Ta4Pd8 cuboctahedra; and faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 12-coordinate geometry to two equivalent Ta(1); two equivalent Ta(3); four Rh(1,1); and four Pd(2,2) atoms. In the second Rh site, Rh(1) is bonded in a 12-coordinate geometry to two equivalent Ta(1), two equivalent Ta(3), four equivalent Rh(1), and four equivalent Pd(2) atoms. There are three inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to two equivalent Ta(2); two equivalent Ta(3); four equivalent Pd(1); and four Pd(2,2) atoms to form distorted PdTa4Pd8 cuboctahedra that share corners with six equivalent Pd(1)Ta4Pd8 cuboctahedra; edges with two equivalent Ta(2)Pd12 cuboctahedra; edges with two equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with four equivalent Ta(3)Pd9Rh3 cuboctahedra; edges with four equivalent Pd(1)Ta4Pd8 cuboctahedra; edges with eight Pd(2,2)Ta4Pd6Rh2 cuboctahedra; faces with two equivalent Ta(2)Pd12 cuboctahedra; faces with two equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with four equivalent Pd(1)Ta4Pd8 cuboctahedra; and faces with ten Pd(2,2)Ta4Pd6Rh2 cuboctahedra. In the second Pd site, Pd(2) is bonded to one Ta(1); one Ta(2); two equivalent Ta(3); two Rh(1,1); two equivalent Pd(1); and four Pd(2,2) atoms to form distorted PdTa4Pd6Rh2 cuboctahedra that share corners with four equivalent Ta(3)Pd9Rh3 cuboctahedra; corners with fourteen Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with two equivalent Ta(2)Pd12 cuboctahedra; edges with two equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with two equivalent Ta(3)Pd9Rh3 cuboctahedra; edges with four Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with four equivalent Pd(1)Ta4Pd8 cuboctahedra;  a faceface with one Ta(2)Pd12 cuboctahedra;  a faceface with one Ta(1)Pd6Rh6 cuboctahedra; faces with two equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with five equivalent Pd(1)Ta4Pd8 cuboctahedra; and faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra. In the third Pd site, Pd(2) is bonded to one Ta(1), one Ta(2), two equivalent Ta(3), two equivalent Rh(1), two equivalent Pd(1), and four equivalent Pd(2) atoms to form distorted PdTa4Pd6Rh2 cuboctahedra that share corners with four equivalent Ta(3)Pd9Rh3 cuboctahedra; corners with fourteen Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with two equivalent Ta(2)Pd12 cuboctahedra; edges with two equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with two equivalent Ta(3)Pd9Rh3 cuboctahedra; edges with four equivalent Pd(2)Ta4Pd6Rh2 cuboctahedra; edges with four equivalent Pd(1)Ta4Pd8 cuboctahedra;  a faceface with one Ta(2)Pd12 cuboctahedra;  a faceface with one Ta(1)Pd6Rh6 cuboctahedra; faces with two equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with five equivalent Pd(1)Ta4Pd8 cuboctahedra; and faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra.
Ta4(RhPd3)3 is beta Cu3Ti-derived structured and crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to six Rh(1,1) and six Pd(2,2) atoms to form TaPd6Rh6 cuboctahedra that share corners with six equivalent Ta(2)Pd12 cuboctahedra; corners with six equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with six equivalent Pd(1)Ta4Pd8 cuboctahedra; edges with twelve Pd(2,2)Ta4Pd6Rh2 cuboctahedra; faces with six equivalent Ta(3)Pd9Rh3 cuboctahedra; and faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra. All Ta(1)-Rh(1,1) bond lengths are 2.79 Å. All Ta(1)-Pd(2,2) bond lengths are 2.80 Å. In the second Ta site, Ta(2) is bonded to six equivalent Pd(1) and six Pd(2,2) atoms to form TaPd12 cuboctahedra that share corners with six equivalent Ta(2)Pd12 cuboctahedra; corners with six equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with six equivalent Pd(1)Ta4Pd8 cuboctahedra; edges with twelve Pd(2,2)Ta4Pd6Rh2 cuboctahedra; faces with six equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra; and faces with six equivalent Pd(1)Ta4Pd8 cuboctahedra. All Ta(2)-Pd(1) bond lengths are 2.79 Å. All Ta(2)-Pd(2,2) bond lengths are 2.80 Å. In the third Ta site, Ta(3) is bonded to three Rh(1,1); three equivalent Pd(1); and six Pd(2,2) atoms to form TaPd9Rh3 cuboctahedra that share corners with six equivalent Ta(3)Pd9Rh3 cuboctahedra; corners with twelve Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with six equivalent Pd(1)Ta4Pd8 cuboctahedra; faces with two equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with three equivalent Ta(2)Pd12 cuboctahedra; faces with three equivalent Ta(1)Pd6Rh6 cuboctahedra; faces with three equivalent Pd(1)Ta4Pd8 cuboctahedra; and faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra. All Ta(3)-Rh(1,1) bond lengths are 2.68 Å. All Ta(3)-Pd(1) bond lengths are 2.93 Å. All Ta(3)-Pd(2,2) bond lengths are 2.80 Å. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 12-coordinate geometry to two equivalent Ta(1); two equivalent Ta(3); four Rh(1,1); and four Pd(2,2) atoms. There are two shorter (2.78 Å) and two longer (2.81 Å) Rh(1)-Rh(1,1) bond lengths. All Rh(1)-Pd(2,2) bond lengths are 2.79 Å. In the second Rh site, Rh(1) is bonded in a 12-coordinate geometry to two equivalent Ta(1), two equivalent Ta(3), four equivalent Rh(1), and four equivalent Pd(2) atoms. All Rh(1)-Pd(2) bond lengths are 2.79 Å. There are three inequivalent Pd sites. In the first Pd site, Pd(1) is bonded to two equivalent Ta(2); two equivalent Ta(3); four equivalent Pd(1); and four Pd(2,2) atoms to form distorted PdTa4Pd8 cuboctahedra that share corners with six equivalent Pd(1)Ta4Pd8 cuboctahedra; edges with two equivalent Ta(2)Pd12 cuboctahedra; edges with two equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with four equivalent Ta(3)Pd9Rh3 cuboctahedra; edges with four equivalent Pd(1)Ta4Pd8 cuboctahedra; edges with eight Pd(2,2)Ta4Pd6Rh2 cuboctahedra; faces with two equivalent Ta(2)Pd12 cuboctahedra; faces with two equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with four equivalent Pd(1)Ta4Pd8 cuboctahedra; and faces with ten Pd(2,2)Ta4Pd6Rh2 cuboctahedra. There are two shorter (2.78 Å) and two longer (2.81 Å) Pd(1)-Pd(1) bond lengths. All Pd(1)-Pd(2,2) bond lengths are 2.81 Å. In the second Pd site, Pd(2) is bonded to one Ta(1); one Ta(2); two equivalent Ta(3); two Rh(1,1); two equivalent Pd(1); and four Pd(2,2) atoms to form distorted PdTa4Pd6Rh2 cuboctahedra that share corners with four equivalent Ta(3)Pd9Rh3 cuboctahedra; corners with fourteen Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with two equivalent Ta(2)Pd12 cuboctahedra; edges with two equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with two equivalent Ta(3)Pd9Rh3 cuboctahedra; edges with four Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with four equivalent Pd(1)Ta4Pd8 cuboctahedra;  a faceface with one Ta(2)Pd12 cuboctahedra;  a faceface with one Ta(1)Pd6Rh6 cuboctahedra; faces with two equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with five equivalent Pd(1)Ta4Pd8 cuboctahedra; and faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra. There are two shorter (2.77 Å) and two longer (2.81 Å) Pd(2)-Pd(2,2) bond lengths. In the third Pd site, Pd(2) is bonded to one Ta(1), one Ta(2), two equivalent Ta(3), two equivalent Rh(1), two equivalent Pd(1), and four equivalent Pd(2) atoms to form distorted PdTa4Pd6Rh2 cuboctahedra that share corners with four equivalent Ta(3)Pd9Rh3 cuboctahedra; corners with fourteen Pd(2,2)Ta4Pd6Rh2 cuboctahedra; edges with two equivalent Ta(2)Pd12 cuboctahedra; edges with two equivalent Ta(1)Pd6Rh6 cuboctahedra; edges with two equivalent Ta(3)Pd9Rh3 cuboctahedra; edges with four equivalent Pd(2)Ta4Pd6Rh2 cuboctahedra; edges with four equivalent Pd(1)Ta4Pd8 cuboctahedra;  a faceface with one Ta(2)Pd12 cuboctahedra;  a faceface with one Ta(1)Pd6Rh6 cuboctahedra; faces with two equivalent Ta(3)Pd9Rh3 cuboctahedra; faces with five equivalent Pd(1)Ta4Pd8 cuboctahedra; and faces with six Pd(2,2)Ta4Pd6Rh2 cuboctahedra.