NdSeO crystallizes in the orthorhombic Cmce space group. Nd(1) is bonded in a 4-coordinate geometry to four equivalent Se(1) and four equivalent O(1) atoms. Se(1) is bonded to four equivalent Nd(1) and one Se(1) atom to form distorted SeNd4Se trigonal bipyramids that share corners with twelve equivalent O(1)Nd4 tetrahedra, edges with two equivalent O(1)Nd4 tetrahedra, and edges with six equivalent Se(1)Nd4Se trigonal bipyramids. O(1) is bonded to four equivalent Nd(1) atoms to form distorted ONd4 tetrahedra that share corners with four equivalent O(1)Nd4 tetrahedra, corners with twelve equivalent Se(1)Nd4Se trigonal bipyramids, edges with four equivalent O(1)Nd4 tetrahedra, and edges with two equivalent Se(1)Nd4Se trigonal bipyramids.
NdSeO crystallizes in the orthorhombic Cmce space group. Nd(1) is bonded in a 4-coordinate geometry to four equivalent Se(1) and four equivalent O(1) atoms. All Nd(1)-Se(1) bond lengths are 3.21 Å. There are two shorter (2.36 Å) and two longer (2.41 Å) Nd(1)-O(1) bond lengths. Se(1) is bonded to four equivalent Nd(1) and one Se(1) atom to form distorted SeNd4Se trigonal bipyramids that share corners with twelve equivalent O(1)Nd4 tetrahedra, edges with two equivalent O(1)Nd4 tetrahedra, and edges with six equivalent Se(1)Nd4Se trigonal bipyramids. The Se(1)-Se(1) bond length is 2.38 Å. O(1) is bonded to four equivalent Nd(1) atoms to form distorted ONd4 tetrahedra that share corners with four equivalent O(1)Nd4 tetrahedra, corners with twelve equivalent Se(1)Nd4Se trigonal bipyramids, edges with four equivalent O(1)Nd4 tetrahedra, and edges with two equivalent Se(1)Nd4Se trigonal bipyramids.