SrCaI4 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded to one I(4), two equivalent I(1), two equivalent I(2), and two equivalent I(3) atoms to form distorted SrI7 pentagonal bipyramids that share corners with three equivalent Ca(1)I5 trigonal bipyramids, edges with three equivalent Sr(1)I7 pentagonal bipyramids, and edges with three equivalent Ca(1)I5 trigonal bipyramids. Ca(1) is bonded to one I(1), one I(2), one I(4), and two equivalent I(3) atoms to form distorted CaI5 trigonal bipyramids that share corners with three equivalent Sr(1)I7 pentagonal bipyramids, corners with two equivalent Ca(1)I5 trigonal bipyramids, and edges with three equivalent Sr(1)I7 pentagonal bipyramids. There are four inequivalent I sites. In the first I site, I(1) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1) and one Ca(1) atom. In the second I site, I(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Sr(1) and one Ca(1) atom. In the third I site, I(3) is bonded to two equivalent Sr(1) and two equivalent Ca(1) atoms to form distorted edge-sharing ISr2Ca2 trigonal pyramids. In the fourth I site, I(4) is bonded in a water-like geometry to one Sr(1) and one Ca(1) atom.
SrCaI4 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded to one I(4), two equivalent I(1), two equivalent I(2), and two equivalent I(3) atoms to form distorted SrI7 pentagonal bipyramids that share corners with three equivalent Ca(1)I5 trigonal bipyramids, edges with three equivalent Sr(1)I7 pentagonal bipyramids, and edges with three equivalent Ca(1)I5 trigonal bipyramids. The Sr(1)-I(4) bond length is 3.22 Å. There is one shorter (3.41 Å) and one longer (3.52 Å) Sr(1)-I(1) bond length. There is one shorter (3.38 Å) and one longer (3.45 Å) Sr(1)-I(2) bond length. There is one shorter (3.51 Å) and one longer (3.52 Å) Sr(1)-I(3) bond length. Ca(1) is bonded to one I(1), one I(2), one I(4), and two equivalent I(3) atoms to form distorted CaI5 trigonal bipyramids that share corners with three equivalent Sr(1)I7 pentagonal bipyramids, corners with two equivalent Ca(1)I5 trigonal bipyramids, and edges with three equivalent Sr(1)I7 pentagonal bipyramids. The Ca(1)-I(1) bond length is 3.06 Å. The Ca(1)-I(2) bond length is 3.11 Å. The Ca(1)-I(4) bond length is 2.99 Å. There is one shorter (3.22 Å) and one longer (3.24 Å) Ca(1)-I(3) bond length. There are four inequivalent I sites. In the first I site, I(1) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1) and one Ca(1) atom. In the second I site, I(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Sr(1) and one Ca(1) atom. In the third I site, I(3) is bonded to two equivalent Sr(1) and two equivalent Ca(1) atoms to form distorted edge-sharing ISr2Ca2 trigonal pyramids. In the fourth I site, I(4) is bonded in a water-like geometry to one Sr(1) and one Ca(1) atom.