Sr4Au15In17 crystallizes in the monoclinic Pm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent Au(12), two equivalent Au(4), and two equivalent Au(8) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent Au(11), two equivalent Au(3), and two equivalent Au(7) atoms. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to two equivalent Au(10), two equivalent Au(2), and two equivalent Au(6) atoms. In the fourth Sr site, Sr(4) is bonded in a 16-coordinate geometry to two equivalent Au(1), two equivalent Au(13), two equivalent Au(5), two equivalent Au(9), one In(12), one In(13), one In(17), one In(7), two equivalent In(5), and two equivalent In(9) atoms. There are fifteen inequivalent Au sites. In the first Au site, Au(1) is bonded in a 9-coordinate geometry to two equivalent Sr(4), one Au(13), one In(1), one In(5), two equivalent In(12), and two equivalent In(7) atoms. In the second Au site, Au(2) is bonded in a 9-coordinate geometry to two equivalent Sr(3), one Au(14), one In(2), one In(6), two equivalent In(11), and two equivalent In(8) atoms. In the third Au site, Au(3) is bonded in a 9-coordinate geometry to two equivalent Sr(2), one Au(15), one In(3), one In(7), two equivalent In(10), and two equivalent In(5) atoms. In the fourth Au site, Au(4) is bonded in a 9-coordinate geometry to two equivalent Sr(1), one In(13), one In(4), one In(8), two equivalent In(6), and two equivalent In(9) atoms. In the fifth Au site, Au(5) is bonded in a 9-coordinate geometry to two equivalent Sr(4), one In(14), one In(5), one In(9), two equivalent In(13), and two equivalent In(3) atoms. In the sixth Au site, Au(6) is bonded in a 7-coordinate geometry to two equivalent Sr(3), one In(10), one In(15), one In(6), and two equivalent In(4) atoms. In the seventh Au site, Au(7) is bonded in a 7-coordinate geometry to two equivalent Sr(2), one In(11), one In(16), one In(7), and two equivalent In(1) atoms. In the eighth Au site, Au(8) is bonded in a 7-coordinate geometry to two equivalent Sr(1), one In(12), one In(17), one In(8), and two equivalent In(2) atoms. In the ninth Au site, Au(9) is bonded in a 9-coordinate geometry to two equivalent Sr(4), one Au(13), one In(15), one In(9), two equivalent In(17), and two equivalent In(4) atoms. In the tenth Au site, Au(10) is bonded in a 8-coordinate geometry to two equivalent Sr(3), one In(10), one In(14), two equivalent In(16), and two equivalent In(3) atoms. In the eleventh Au site, Au(11) is bonded in a 9-coordinate geometry to two equivalent Sr(2), one Au(15), one In(11), one In(17), two equivalent In(15), and two equivalent In(2) atoms. In the twelfth Au site, Au(12) is bonded in a 9-coordinate geometry to two equivalent Sr(1), one In(12), one In(13), one In(16), two equivalent In(1), and two equivalent In(14) atoms. In the thirteenth Au site, Au(13) is bonded in a 4-coordinate geometry to two equivalent Sr(4), one Au(1), one Au(9), two equivalent In(12), and two equivalent In(17) atoms. In the fourteenth Au site, Au(14) is bonded in a 4-coordinate geometry to one Au(2), two equivalent In(11), and two equivalent In(16) atoms. In the fifteenth Au site, Au(15) is bonded in a distorted square co-planar geometry to one Au(11), one Au(3), two equivalent In(10), and two equivalent In(15) atoms. There are seventeen inequivalent In sites. In the first In site, In(1) is bonded in a 5-coordinate geometry to one Au(1), two equivalent Au(12), and two equivalent Au(7) atoms. In the second In site, In(2) is bonded in a 5-coordinate geometry to one Au(2), two equivalent Au(11), and two equivalent Au(8) atoms. In the third In site, In(3) is bonded in a 5-coordinate geometry to one Au(3), two equivalent Au(10), and two equivalent Au(5) atoms. In the fourth In site, In(4) is bonded in a 5-coordinate geometry to one Au(4), two equivalent Au(6), and two equivalent Au(9) atoms. In the fifth In site, In(5) is bonded to two equivalent Sr(4), one Au(1), one Au(5), and two equivalent Au(3) atoms to form distorted InSr2Au4 tetrahedra that share edges with two equivalent In(5)Sr2Au4 tetrahedra, edges with two equivalent In(13)SrAu4 tetrahedra, and faces with two equivalent In(7)SrAu4 tetrahedra. In the sixth In site, In(6) is bonded to one Au(2), one Au(6), and two equivalent Au(4) atoms to form distorted InAu4 tetrahedra that share corners with two equivalent In(6)Au4 tetrahedra, corners with two equivalent In(13)SrAu4 tetrahedra, and edges with two equivalent In(8)Au4 tetrahedra. In the seventh In site, In(7) is bonded to one Sr(4), one Au(3), one Au(7), and two equivalent Au(1) atoms to form distorted InSrAu4 tetrahedra that share  a cornercorner with one In(13)SrAu4 tetrahedra, corners with two equivalent In(7)SrAu4 tetrahedra, and faces with two equivalent In(5)Sr2Au4 tetrahedra. In the eighth In site, In(8) is bonded to one Au(4), one Au(8), and two equivalent Au(2) atoms to form distorted InAu4 tetrahedra that share  a cornercorner with one In(13)SrAu4 tetrahedra, corners with two equivalent In(8)Au4 tetrahedra, and edges with two equivalent In(6)Au4 tetrahedra. In the ninth In site, In(9) is bonded in a 4-coordinate geometry to two equivalent Sr(4), one Au(5), one Au(9), and two equivalent Au(4) atoms. In the tenth In site, In(10) is bonded in a 6-coordinate geometry to one Au(10), one Au(6), two equivalent Au(15), and two equivalent Au(3) atoms. In the eleventh In site, In(11) is bonded in a 6-coordinate geometry to one Au(11), one Au(7), two equivalent Au(14), and two equivalent Au(2) atoms. In the twelfth In site, In(12) is bonded in a 6-coordinate geometry to one Sr(4), one Au(12), one Au(8), two equivalent Au(1), and two equivalent Au(13) atoms. In the thirteenth In site, In(13) is bonded to one Sr(4), one Au(12), one Au(4), and two equivalent Au(5) atoms to form distorted InSrAu4 tetrahedra that share  a cornercorner with one In(8)Au4 tetrahedra,  a cornercorner with one In(7)SrAu4 tetrahedra, corners with two equivalent In(6)Au4 tetrahedra, corners with two equivalent In(13)SrAu4 tetrahedra, and edges with two equivalent In(5)Sr2Au4 tetrahedra. In the fourteenth In site, In(14) is bonded in a 4-coordinate geometry to one Au(10), one Au(5), and two equivalent Au(12) atoms. In the fifteenth In site, In(15) is bonded in a 6-coordinate geometry to one Au(6), one Au(9), two equivalent Au(11), and two equivalent Au(15) atoms. In the sixteenth In site, In(16) is bonded in a 5-coordinate geometry to one Au(12), one Au(7), two equivalent Au(10), and two equivalent Au(14) atoms. In the seventeenth In site, In(17) is bonded in a 5-coordinate geometry to one Sr(4), one Au(11), one Au(8), two equivalent Au(13), and two equivalent Au(9) atoms.
Sr4Au15In17 crystallizes in the monoclinic Pm space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to two equivalent Au(12), two equivalent Au(4), and two equivalent Au(8) atoms. Both Sr(1)-Au(12) bond lengths are 3.41 Å. Both Sr(1)-Au(4) bond lengths are 3.55 Å. Both Sr(1)-Au(8) bond lengths are 3.33 Å. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent Au(11), two equivalent Au(3), and two equivalent Au(7) atoms. Both Sr(2)-Au(11) bond lengths are 3.44 Å. Both Sr(2)-Au(3) bond lengths are 3.47 Å. Both Sr(2)-Au(7) bond lengths are 3.39 Å. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to two equivalent Au(10), two equivalent Au(2), and two equivalent Au(6) atoms. Both Sr(3)-Au(10) bond lengths are 3.42 Å. Both Sr(3)-Au(2) bond lengths are 3.56 Å. Both Sr(3)-Au(6) bond lengths are 3.34 Å. In the fourth Sr site, Sr(4) is bonded in a 16-coordinate geometry to two equivalent Au(1), two equivalent Au(13), two equivalent Au(5), two equivalent Au(9), one In(12), one In(13), one In(17), one In(7), two equivalent In(5), and two equivalent In(9) atoms. Both Sr(4)-Au(1) bond lengths are 3.43 Å. Both Sr(4)-Au(13) bond lengths are 3.85 Å. Both Sr(4)-Au(5) bond lengths are 3.47 Å. Both Sr(4)-Au(9) bond lengths are 3.51 Å. The Sr(4)-In(12) bond length is 3.74 Å. The Sr(4)-In(13) bond length is 3.79 Å. The Sr(4)-In(17) bond length is 3.72 Å. The Sr(4)-In(7) bond length is 3.92 Å. Both Sr(4)-In(5) bond lengths are 3.84 Å. Both Sr(4)-In(9) bond lengths are 3.61 Å. There are fifteen inequivalent Au sites. In the first Au site, Au(1) is bonded in a 9-coordinate geometry to two equivalent Sr(4), one Au(13), one In(1), one In(5), two equivalent In(12), and two equivalent In(7) atoms. The Au(1)-Au(13) bond length is 2.92 Å. The Au(1)-In(1) bond length is 2.94 Å. The Au(1)-In(5) bond length is 2.89 Å. Both Au(1)-In(12) bond lengths are 2.96 Å. Both Au(1)-In(7) bond lengths are 2.89 Å. In the second Au site, Au(2) is bonded in a 9-coordinate geometry to two equivalent Sr(3), one Au(14), one In(2), one In(6), two equivalent In(11), and two equivalent In(8) atoms. The Au(2)-Au(14) bond length is 2.87 Å. The Au(2)-In(2) bond length is 2.93 Å. The Au(2)-In(6) bond length is 2.80 Å. Both Au(2)-In(11) bond lengths are 2.92 Å. Both Au(2)-In(8) bond lengths are 2.92 Å. In the third Au site, Au(3) is bonded in a 9-coordinate geometry to two equivalent Sr(2), one Au(15), one In(3), one In(7), two equivalent In(10), and two equivalent In(5) atoms. The Au(3)-Au(15) bond length is 2.90 Å. The Au(3)-In(3) bond length is 2.91 Å. The Au(3)-In(7) bond length is 2.84 Å. Both Au(3)-In(10) bond lengths are 2.97 Å. Both Au(3)-In(5) bond lengths are 2.92 Å. In the fourth Au site, Au(4) is bonded in a 9-coordinate geometry to two equivalent Sr(1), one In(13), one In(4), one In(8), two equivalent In(6), and two equivalent In(9) atoms. The Au(4)-In(13) bond length is 2.87 Å. The Au(4)-In(4) bond length is 2.99 Å. The Au(4)-In(8) bond length is 2.82 Å. Both Au(4)-In(6) bond lengths are 2.96 Å. Both Au(4)-In(9) bond lengths are 2.87 Å. In the fifth Au site, Au(5) is bonded in a 9-coordinate geometry to two equivalent Sr(4), one In(14), one In(5), one In(9), two equivalent In(13), and two equivalent In(3) atoms. The Au(5)-In(14) bond length is 2.86 Å. The Au(5)-In(5) bond length is 2.80 Å. The Au(5)-In(9) bond length is 2.98 Å. Both Au(5)-In(13) bond lengths are 2.95 Å. Both Au(5)-In(3) bond lengths are 3.07 Å. In the sixth Au site, Au(6) is bonded in a 7-coordinate geometry to two equivalent Sr(3), one In(10), one In(15), one In(6), and two equivalent In(4) atoms. The Au(6)-In(10) bond length is 2.97 Å. The Au(6)-In(15) bond length is 2.80 Å. The Au(6)-In(6) bond length is 2.76 Å. Both Au(6)-In(4) bond lengths are 2.95 Å. In the seventh Au site, Au(7) is bonded in a 7-coordinate geometry to two equivalent Sr(2), one In(11), one In(16), one In(7), and two equivalent In(1) atoms. The Au(7)-In(11) bond length is 2.91 Å. The Au(7)-In(16) bond length is 2.81 Å. The Au(7)-In(7) bond length is 2.75 Å. Both Au(7)-In(1) bond lengths are 2.98 Å. In the eighth Au site, Au(8) is bonded in a 7-coordinate geometry to two equivalent Sr(1), one In(12), one In(17), one In(8), and two equivalent In(2) atoms. The Au(8)-In(12) bond length is 3.00 Å. The Au(8)-In(17) bond length is 2.77 Å. The Au(8)-In(8) bond length is 2.76 Å. Both Au(8)-In(2) bond lengths are 2.97 Å. In the ninth Au site, Au(9) is bonded in a 9-coordinate geometry to two equivalent Sr(4), one Au(13), one In(15), one In(9), two equivalent In(17), and two equivalent In(4) atoms. The Au(9)-Au(13) bond length is 2.98 Å. The Au(9)-In(15) bond length is 3.20 Å. The Au(9)-In(9) bond length is 2.77 Å. Both Au(9)-In(17) bond lengths are 2.84 Å. Both Au(9)-In(4) bond lengths are 2.95 Å. In the tenth Au site, Au(10) is bonded in a 8-coordinate geometry to two equivalent Sr(3), one In(10), one In(14), two equivalent In(16), and two equivalent In(3) atoms. The Au(10)-In(10) bond length is 2.80 Å. The Au(10)-In(14) bond length is 3.11 Å. Both Au(10)-In(16) bond lengths are 2.88 Å. Both Au(10)-In(3) bond lengths are 2.98 Å. In the eleventh Au site, Au(11) is bonded in a 9-coordinate geometry to two equivalent Sr(2), one Au(15), one In(11), one In(17), two equivalent In(15), and two equivalent In(2) atoms. The Au(11)-Au(15) bond length is 2.98 Å. The Au(11)-In(11) bond length is 2.83 Å. The Au(11)-In(17) bond length is 3.32 Å. Both Au(11)-In(15) bond lengths are 2.90 Å. Both Au(11)-In(2) bond lengths are 2.93 Å. In the twelfth Au site, Au(12) is bonded in a 9-coordinate geometry to two equivalent Sr(1), one In(12), one In(13), one In(16), two equivalent In(1), and two equivalent In(14) atoms. The Au(12)-In(12) bond length is 2.82 Å. The Au(12)-In(13) bond length is 2.98 Å. The Au(12)-In(16) bond length is 3.38 Å. Both Au(12)-In(1) bond lengths are 3.05 Å. Both Au(12)-In(14) bond lengths are 2.89 Å. In the thirteenth Au site, Au(13) is bonded in a 4-coordinate geometry to two equivalent Sr(4), one Au(1), one Au(9), two equivalent In(12), and two equivalent In(17) atoms. Both Au(13)-In(12) bond lengths are 2.87 Å. Both Au(13)-In(17) bond lengths are 2.98 Å. In the fourteenth Au site, Au(14) is bonded in a 4-coordinate geometry to one Au(2), two equivalent In(11), and two equivalent In(16) atoms. Both Au(14)-In(11) bond lengths are 2.93 Å. Both Au(14)-In(16) bond lengths are 2.97 Å. In the fifteenth Au site, Au(15) is bonded in a distorted square co-planar geometry to one Au(11), one Au(3), two equivalent In(10), and two equivalent In(15) atoms. Both Au(15)-In(10) bond lengths are 2.88 Å. Both Au(15)-In(15) bond lengths are 2.98 Å. There are seventeen inequivalent In sites. In the first In site, In(1) is bonded in a 5-coordinate geometry to one Au(1), two equivalent Au(12), and two equivalent Au(7) atoms. In the second In site, In(2) is bonded in a 5-coordinate geometry to one Au(2), two equivalent Au(11), and two equivalent Au(8) atoms. In the third In site, In(3) is bonded in a 5-coordinate geometry to one Au(3), two equivalent Au(10), and two equivalent Au(5) atoms. In the fourth In site, In(4) is bonded in a 5-coordinate geometry to one Au(4), two equivalent Au(6), and two equivalent Au(9) atoms. In the fifth In site, In(5) is bonded to two equivalent Sr(4), one Au(1), one Au(5), and two equivalent Au(3) atoms to form distorted InSr2Au4 tetrahedra that share edges with two equivalent In(5)Sr2Au4 tetrahedra, edges with two equivalent In(13)SrAu4 tetrahedra, and faces with two equivalent In(7)SrAu4 tetrahedra. In the sixth In site, In(6) is bonded to one Au(2), one Au(6), and two equivalent Au(4) atoms to form distorted InAu4 tetrahedra that share corners with two equivalent In(6)Au4 tetrahedra, corners with two equivalent In(13)SrAu4 tetrahedra, and edges with two equivalent In(8)Au4 tetrahedra. In the seventh In site, In(7) is bonded to one Sr(4), one Au(3), one Au(7), and two equivalent Au(1) atoms to form distorted InSrAu4 tetrahedra that share  a cornercorner with one In(13)SrAu4 tetrahedra, corners with two equivalent In(7)SrAu4 tetrahedra, and faces with two equivalent In(5)Sr2Au4 tetrahedra. In the eighth In site, In(8) is bonded to one Au(4), one Au(8), and two equivalent Au(2) atoms to form distorted InAu4 tetrahedra that share  a cornercorner with one In(13)SrAu4 tetrahedra, corners with two equivalent In(8)Au4 tetrahedra, and edges with two equivalent In(6)Au4 tetrahedra. In the ninth In site, In(9) is bonded in a 4-coordinate geometry to two equivalent Sr(4), one Au(5), one Au(9), and two equivalent Au(4) atoms. In the tenth In site, In(10) is bonded in a 6-coordinate geometry to one Au(10), one Au(6), two equivalent Au(15), and two equivalent Au(3) atoms. In the eleventh In site, In(11) is bonded in a 6-coordinate geometry to one Au(11), one Au(7), two equivalent Au(14), and two equivalent Au(2) atoms. In the twelfth In site, In(12) is bonded in a 6-coordinate geometry to one Sr(4), one Au(12), one Au(8), two equivalent Au(1), and two equivalent Au(13) atoms. In the thirteenth In site, In(13) is bonded to one Sr(4), one Au(12), one Au(4), and two equivalent Au(5) atoms to form distorted InSrAu4 tetrahedra that share  a cornercorner with one In(8)Au4 tetrahedra,  a cornercorner with one In(7)SrAu4 tetrahedra, corners with two equivalent In(6)Au4 tetrahedra, corners with two equivalent In(13)SrAu4 tetrahedra, and edges with two equivalent In(5)Sr2Au4 tetrahedra. In the fourteenth In site, In(14) is bonded in a 4-coordinate geometry to one Au(10), one Au(5), and two equivalent Au(12) atoms. In the fifteenth In site, In(15) is bonded in a 6-coordinate geometry to one Au(6), one Au(9), two equivalent Au(11), and two equivalent Au(15) atoms. In the sixteenth In site, In(16) is bonded in a 5-coordinate geometry to one Au(12), one Au(7), two equivalent Au(10), and two equivalent Au(14) atoms. In the seventeenth In site, In(17) is bonded in a 5-coordinate geometry to one Sr(4), one Au(11), one Au(8), two equivalent Au(13), and two equivalent Au(9) atoms.