FeSe crystallizes in the orthorhombic Pnma space group. Fe(1) is bonded to six equivalent Se(1) atoms to form a mixture of distorted edge, face, and corner-sharing FeSe6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. Se(1) is bonded in a 6-coordinate geometry to six equivalent Fe(1) atoms.
FeSe crystallizes in the orthorhombic Pnma space group. Fe(1) is bonded to six equivalent Se(1) atoms to form a mixture of distorted edge, face, and corner-sharing FeSe6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. There are a spread of Fe(1)-Se(1) bond distances ranging from 2.52-2.56 Å. Se(1) is bonded in a 6-coordinate geometry to six equivalent Fe(1) atoms.