Sr8Cu3In4N5 crystallizes in the orthorhombic Immm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one In(1), two equivalent In(2), and three equivalent N(1) atoms. In the second Sr site, Sr(2) is bonded in a 3-coordinate geometry to two equivalent In(1), one N(2), and two equivalent N(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a linear geometry to two equivalent N(1) atoms. In the second Cu site, Cu(2) is bonded in a linear geometry to two equivalent N(2) atoms. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), and four equivalent In(2) atoms. In the second In site, In(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), one In(2), and four equivalent In(1) atoms. There are two inequivalent N sites. In the first N site, N(2) is bonded to four equivalent Sr(2) and two equivalent Cu(2) atoms to form NSr4Cu2 octahedra that share corners with two equivalent N(2)Sr4Cu2 octahedra and corners with eight equivalent N(1)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the second N site, N(1) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Cu(1) atom to form NSr5Cu octahedra that share  a cornercorner with one N(1)Sr5Cu octahedra, corners with two equivalent N(2)Sr4Cu2 octahedra, and edges with four equivalent N(1)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 2-61°.
Sr8Cu3In4N5 crystallizes in the orthorhombic Immm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one In(1), two equivalent In(2), and three equivalent N(1) atoms. The Sr(1)-In(1) bond length is 4.02 Å. Both Sr(1)-In(2) bond lengths are 3.61 Å. There is one shorter (2.52 Å) and two longer (2.64 Å) Sr(1)-N(1) bond lengths. In the second Sr site, Sr(2) is bonded in a 3-coordinate geometry to two equivalent In(1), one N(2), and two equivalent N(1) atoms. Both Sr(2)-In(1) bond lengths are 3.67 Å. The Sr(2)-N(2) bond length is 2.67 Å. Both Sr(2)-N(1) bond lengths are 2.66 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a linear geometry to two equivalent N(1) atoms. Both Cu(1)-N(1) bond lengths are 1.89 Å. In the second Cu site, Cu(2) is bonded in a linear geometry to two equivalent N(2) atoms. Both Cu(2)-N(2) bond lengths are 1.93 Å. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), four equivalent Sr(2), and four equivalent In(2) atoms. All In(1)-In(2) bond lengths are 3.11 Å. In the second In site, In(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), one In(2), and four equivalent In(1) atoms. The In(2)-In(2) bond length is 3.20 Å. There are two inequivalent N sites. In the first N site, N(2) is bonded to four equivalent Sr(2) and two equivalent Cu(2) atoms to form NSr4Cu2 octahedra that share corners with two equivalent N(2)Sr4Cu2 octahedra and corners with eight equivalent N(1)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the second N site, N(1) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Cu(1) atom to form NSr5Cu octahedra that share  a cornercorner with one N(1)Sr5Cu octahedra, corners with two equivalent N(2)Sr4Cu2 octahedra, and edges with four equivalent N(1)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 2-61°.