Ce16Ru9 crystallizes in the trigonal R-3m space group. There are seven inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 6-coordinate geometry to one Ce(6), two equivalent Ru(1), two equivalent Ru(2), and two equivalent Ru(3) atoms. In the second Ce site, Ce(2) is bonded in a 4-coordinate geometry to one Ce(7), one Ru(2), one Ru(3), and two equivalent Ru(1) atoms. In the third Ce site, Ce(3) is bonded to one Ce(6), two equivalent Ru(2), and two equivalent Ru(3) atoms to form a mixture of distorted corner and edge-sharing CeCeRu4 trigonal pyramids. In the fourth Ce site, Ce(4) is bonded in a 4-coordinate geometry to one Ce(7), two equivalent Ru(1), and two equivalent Ru(2) atoms. In the fifth Ce site, Ce(5) is bonded in a 3-coordinate geometry to one Ru(2), two equivalent Ru(1), and two equivalent Ru(3) atoms. In the sixth Ce site, Ce(6) is bonded in a 18-coordinate geometry to six equivalent Ce(1), six equivalent Ce(3), and six equivalent Ru(2) atoms. In the seventh Ce site, Ce(7) is bonded in a 18-coordinate geometry to six equivalent Ce(2), six equivalent Ce(4), and six equivalent Ru(1) atoms. There are three inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a 8-coordinate geometry to one Ce(7), two equivalent Ce(1), two equivalent Ce(2), two equivalent Ce(4), and two equivalent Ce(5) atoms. In the second Ru site, Ru(2) is bonded in a 9-coordinate geometry to one Ce(2), one Ce(5), one Ce(6), two equivalent Ce(1), two equivalent Ce(3), and two equivalent Ce(4) atoms. In the third Ru site, Ru(3) is bonded in a 7-coordinate geometry to one Ce(2), two equivalent Ce(1), two equivalent Ce(3), and two equivalent Ce(5) atoms.
Ce16Ru9 crystallizes in the trigonal R-3m space group. There are seven inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 6-coordinate geometry to one Ce(6), two equivalent Ru(1), two equivalent Ru(2), and two equivalent Ru(3) atoms. The Ce(1)-Ce(6) bond length is 3.98 Å. Both Ce(1)-Ru(1) bond lengths are 3.18 Å. Both Ce(1)-Ru(2) bond lengths are 3.09 Å. Both Ce(1)-Ru(3) bond lengths are 3.06 Å. In the second Ce site, Ce(2) is bonded in a 4-coordinate geometry to one Ce(7), one Ru(2), one Ru(3), and two equivalent Ru(1) atoms. The Ce(2)-Ce(7) bond length is 3.33 Å. The Ce(2)-Ru(2) bond length is 3.13 Å. The Ce(2)-Ru(3) bond length is 3.10 Å. Both Ce(2)-Ru(1) bond lengths are 2.59 Å. In the third Ce site, Ce(3) is bonded to one Ce(6), two equivalent Ru(2), and two equivalent Ru(3) atoms to form a mixture of distorted corner and edge-sharing CeCeRu4 trigonal pyramids. The Ce(3)-Ce(6) bond length is 3.48 Å. Both Ce(3)-Ru(2) bond lengths are 2.67 Å. There is one shorter (2.85 Å) and one longer (3.01 Å) Ce(3)-Ru(3) bond length. In the fourth Ce site, Ce(4) is bonded in a 4-coordinate geometry to one Ce(7), two equivalent Ru(1), and two equivalent Ru(2) atoms. The Ce(4)-Ce(7) bond length is 3.79 Å. Both Ce(4)-Ru(1) bond lengths are 3.20 Å. Both Ce(4)-Ru(2) bond lengths are 2.86 Å. In the fifth Ce site, Ce(5) is bonded in a 3-coordinate geometry to one Ru(2), two equivalent Ru(1), and two equivalent Ru(3) atoms. The Ce(5)-Ru(2) bond length is 3.44 Å. There is one shorter (2.80 Å) and one longer (3.17 Å) Ce(5)-Ru(1) bond length. Both Ce(5)-Ru(3) bond lengths are 2.65 Å. In the sixth Ce site, Ce(6) is bonded in a 18-coordinate geometry to six equivalent Ce(1), six equivalent Ce(3), and six equivalent Ru(2) atoms. All Ce(6)-Ru(2) bond lengths are 3.74 Å. In the seventh Ce site, Ce(7) is bonded in a 18-coordinate geometry to six equivalent Ce(2), six equivalent Ce(4), and six equivalent Ru(1) atoms. All Ce(7)-Ru(1) bond lengths are 3.88 Å. There are three inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a 8-coordinate geometry to one Ce(7), two equivalent Ce(1), two equivalent Ce(2), two equivalent Ce(4), and two equivalent Ce(5) atoms. In the second Ru site, Ru(2) is bonded in a 9-coordinate geometry to one Ce(2), one Ce(5), one Ce(6), two equivalent Ce(1), two equivalent Ce(3), and two equivalent Ce(4) atoms. In the third Ru site, Ru(3) is bonded in a 7-coordinate geometry to one Ce(2), two equivalent Ce(1), two equivalent Ce(3), and two equivalent Ce(5) atoms.