Sr4GaCN5 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 4-coordinate geometry to one N(1), one N(5), and four equivalent N(4) atoms. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one N(1), one N(2), one N(3), and two equivalent N(5) atoms. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one N(2), one N(4), two equivalent N(1), and two equivalent N(5) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one C(1), one N(5), two equivalent N(1), two equivalent N(2), and two equivalent N(3) atoms. Ga(1) is bonded in a trigonal planar geometry to one N(1), one N(4), and one N(5) atom. C(1) is bonded in a linear geometry to one Sr(4), one N(2), and one N(3) atom. There are five inequivalent N sites. In the first N site, N(5) is bonded in a 7-coordinate geometry to one Sr(1), one Sr(4), two equivalent Sr(2), two equivalent Sr(3), and one Ga(1) atom. In the second N site, N(1) is bonded in a 7-coordinate geometry to one Sr(1), one Sr(2), two equivalent Sr(3), two equivalent Sr(4), and one Ga(1) atom. In the third N site, N(2) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), two equivalent Sr(4), and one C(1) atom. In the fourth N site, N(3) is bonded in a 1-coordinate geometry to one Sr(2), two equivalent Sr(4), and one C(1) atom. In the fifth N site, N(4) is bonded to one Sr(3), four equivalent Sr(1), and one Ga(1) atom to form a mixture of corner and edge-sharing NSr5Ga octahedra. The corner-sharing octahedral tilt angles range from 7-10°.
Sr4GaCN5 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 4-coordinate geometry to one N(1), one N(5), and four equivalent N(4) atoms. The Sr(1)-N(1) bond length is 3.23 Å. The Sr(1)-N(5) bond length is 3.05 Å. There are a spread of Sr(1)-N(4) bond distances ranging from 2.60-2.74 Å. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one N(1), one N(2), one N(3), and two equivalent N(5) atoms. The Sr(2)-N(1) bond length is 2.78 Å. The Sr(2)-N(2) bond length is 2.74 Å. The Sr(2)-N(3) bond length is 2.81 Å. There is one shorter (2.49 Å) and one longer (2.78 Å) Sr(2)-N(5) bond length. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one N(2), one N(4), two equivalent N(1), and two equivalent N(5) atoms. The Sr(3)-N(2) bond length is 2.67 Å. The Sr(3)-N(4) bond length is 2.49 Å. There is one shorter (2.73 Å) and one longer (2.83 Å) Sr(3)-N(1) bond length. There is one shorter (2.88 Å) and one longer (3.13 Å) Sr(3)-N(5) bond length. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one C(1), one N(5), two equivalent N(1), two equivalent N(2), and two equivalent N(3) atoms. The Sr(4)-C(1) bond length is 2.91 Å. The Sr(4)-N(5) bond length is 2.96 Å. There is one shorter (2.51 Å) and one longer (3.13 Å) Sr(4)-N(1) bond length. There is one shorter (2.74 Å) and one longer (2.89 Å) Sr(4)-N(2) bond length. There is one shorter (2.65 Å) and one longer (2.90 Å) Sr(4)-N(3) bond length. Ga(1) is bonded in a trigonal planar geometry to one N(1), one N(4), and one N(5) atom. The Ga(1)-N(1) bond length is 1.92 Å. The Ga(1)-N(4) bond length is 1.91 Å. The Ga(1)-N(5) bond length is 1.93 Å. C(1) is bonded in a linear geometry to one Sr(4), one N(2), and one N(3) atom. The C(1)-N(2) bond length is 1.24 Å. The C(1)-N(3) bond length is 1.23 Å. There are five inequivalent N sites. In the first N site, N(5) is bonded in a 7-coordinate geometry to one Sr(1), one Sr(4), two equivalent Sr(2), two equivalent Sr(3), and one Ga(1) atom. In the second N site, N(1) is bonded in a 7-coordinate geometry to one Sr(1), one Sr(2), two equivalent Sr(3), two equivalent Sr(4), and one Ga(1) atom. In the third N site, N(2) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), two equivalent Sr(4), and one C(1) atom. In the fourth N site, N(3) is bonded in a 1-coordinate geometry to one Sr(2), two equivalent Sr(4), and one C(1) atom. In the fifth N site, N(4) is bonded to one Sr(3), four equivalent Sr(1), and one Ga(1) atom to form a mixture of corner and edge-sharing NSr5Ga octahedra. The corner-sharing octahedral tilt angles range from 7-10°.