LaSeCl crystallizes in the orthorhombic Pnma space group. La(1) is bonded in a 9-coordinate geometry to five equivalent Se(1) and four equivalent Cl(1) atoms. Se(1) is bonded to five equivalent La(1) atoms to form distorted SeLa5 trigonal bipyramids that share corners with eight equivalent Cl(1)La4 tetrahedra, corners with eight equivalent Se(1)La5 trigonal bipyramids, edges with six equivalent Cl(1)La4 tetrahedra, and edges with six equivalent Se(1)La5 trigonal bipyramids. Cl(1) is bonded to four equivalent La(1) atoms to form distorted ClLa4 tetrahedra that share corners with eight equivalent Cl(1)La4 tetrahedra, corners with eight equivalent Se(1)La5 trigonal bipyramids, edges with two equivalent Cl(1)La4 tetrahedra, and edges with six equivalent Se(1)La5 trigonal bipyramids.
LaSeCl crystallizes in the orthorhombic Pnma space group. La(1) is bonded in a 9-coordinate geometry to five equivalent Se(1) and four equivalent Cl(1) atoms. There are a spread of La(1)-Se(1) bond distances ranging from 3.09-3.28 Å. There are a spread of La(1)-Cl(1) bond distances ranging from 2.94-3.08 Å. Se(1) is bonded to five equivalent La(1) atoms to form distorted SeLa5 trigonal bipyramids that share corners with eight equivalent Cl(1)La4 tetrahedra, corners with eight equivalent Se(1)La5 trigonal bipyramids, edges with six equivalent Cl(1)La4 tetrahedra, and edges with six equivalent Se(1)La5 trigonal bipyramids. Cl(1) is bonded to four equivalent La(1) atoms to form distorted ClLa4 tetrahedra that share corners with eight equivalent Cl(1)La4 tetrahedra, corners with eight equivalent Se(1)La5 trigonal bipyramids, edges with two equivalent Cl(1)La4 tetrahedra, and edges with six equivalent Se(1)La5 trigonal bipyramids.