Sr2Pd4Al5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 14-coordinate geometry to one Pd(2), one Pd(3), one Pd(4), three equivalent Pd(1), one Al(1), two equivalent Al(4), two equivalent Al(5), and three equivalent Al(3) atoms. In the second Sr site, Sr(2) is bonded in a 1-coordinate geometry to two equivalent Pd(2), two equivalent Pd(3), and three equivalent Pd(4) atoms. There are four inequivalent Pd sites. In the first Pd site, Pd(2) is bonded in a 9-coordinate geometry to one Sr(1), two equivalent Sr(2), one Al(5), two equivalent Al(3), and three equivalent Al(2) atoms. In the second Pd site, Pd(3) is bonded in a 9-coordinate geometry to one Sr(1), two equivalent Sr(2), one Al(2), one Al(4), two equivalent Al(1), and two equivalent Al(5) atoms. In the third Pd site, Pd(4) is bonded in a 10-coordinate geometry to one Sr(1), three equivalent Sr(2), two equivalent Pd(4), one Al(1), and three equivalent Al(4) atoms. In the fourth Pd site, Pd(1) is bonded in a 7-coordinate geometry to three equivalent Sr(1), one Al(4), one Al(5), two equivalent Al(1), and two equivalent Al(3) atoms. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to one Sr(1), one Pd(4), two equivalent Pd(1), and two equivalent Pd(3) atoms. In the second Al site, Al(2) is bonded in a 4-coordinate geometry to one Pd(3) and three equivalent Pd(2) atoms. In the third Al site, Al(3) is bonded in a 4-coordinate geometry to three equivalent Sr(1), two equivalent Pd(1), and two equivalent Pd(2) atoms. In the fourth Al site, Al(4) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Pd(1), one Pd(3), and three equivalent Pd(4) atoms. In the fifth Al site, Al(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Pd(1), one Pd(2), and two equivalent Pd(3) atoms.
Sr2Pd4Al5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 14-coordinate geometry to one Pd(2), one Pd(3), one Pd(4), three equivalent Pd(1), one Al(1), two equivalent Al(4), two equivalent Al(5), and three equivalent Al(3) atoms. The Sr(1)-Pd(2) bond length is 3.39 Å. The Sr(1)-Pd(3) bond length is 3.19 Å. The Sr(1)-Pd(4) bond length is 3.14 Å. There is one shorter (3.21 Å) and two longer (3.49 Å) Sr(1)-Pd(1) bond lengths. The Sr(1)-Al(1) bond length is 3.45 Å. Both Sr(1)-Al(4) bond lengths are 3.63 Å. Both Sr(1)-Al(5) bond lengths are 3.47 Å. There is one shorter (3.55 Å) and two longer (3.65 Å) Sr(1)-Al(3) bond lengths. In the second Sr site, Sr(2) is bonded in a 1-coordinate geometry to two equivalent Pd(2), two equivalent Pd(3), and three equivalent Pd(4) atoms. Both Sr(2)-Pd(2) bond lengths are 3.32 Å. Both Sr(2)-Pd(3) bond lengths are 3.43 Å. There is one shorter (3.01 Å) and two longer (3.39 Å) Sr(2)-Pd(4) bond lengths. There are four inequivalent Pd sites. In the first Pd site, Pd(2) is bonded in a 9-coordinate geometry to one Sr(1), two equivalent Sr(2), one Al(5), two equivalent Al(3), and three equivalent Al(2) atoms. The Pd(2)-Al(5) bond length is 2.48 Å. Both Pd(2)-Al(3) bond lengths are 2.68 Å. There is one shorter (2.55 Å) and two longer (2.69 Å) Pd(2)-Al(2) bond lengths. In the second Pd site, Pd(3) is bonded in a 9-coordinate geometry to one Sr(1), two equivalent Sr(2), one Al(2), one Al(4), two equivalent Al(1), and two equivalent Al(5) atoms. The Pd(3)-Al(2) bond length is 2.59 Å. The Pd(3)-Al(4) bond length is 2.61 Å. Both Pd(3)-Al(1) bond lengths are 2.71 Å. Both Pd(3)-Al(5) bond lengths are 2.57 Å. In the third Pd site, Pd(4) is bonded in a 10-coordinate geometry to one Sr(1), three equivalent Sr(2), two equivalent Pd(4), one Al(1), and three equivalent Al(4) atoms. Both Pd(4)-Pd(4) bond lengths are 2.82 Å. The Pd(4)-Al(1) bond length is 2.88 Å. There are two shorter (2.47 Å) and one longer (2.76 Å) Pd(4)-Al(4) bond length. In the fourth Pd site, Pd(1) is bonded in a 7-coordinate geometry to three equivalent Sr(1), one Al(4), one Al(5), two equivalent Al(1), and two equivalent Al(3) atoms. The Pd(1)-Al(4) bond length is 2.63 Å. The Pd(1)-Al(5) bond length is 2.58 Å. Both Pd(1)-Al(1) bond lengths are 2.66 Å. Both Pd(1)-Al(3) bond lengths are 2.59 Å. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to one Sr(1), one Pd(4), two equivalent Pd(1), and two equivalent Pd(3) atoms. In the second Al site, Al(2) is bonded in a 4-coordinate geometry to one Pd(3) and three equivalent Pd(2) atoms. In the third Al site, Al(3) is bonded in a 4-coordinate geometry to three equivalent Sr(1), two equivalent Pd(1), and two equivalent Pd(2) atoms. In the fourth Al site, Al(4) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Pd(1), one Pd(3), and three equivalent Pd(4) atoms. In the fifth Al site, Al(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Pd(1), one Pd(2), and two equivalent Pd(3) atoms.