Hexacarbonyl chromium is a coordination compound with the chemical formula Cr (CO) 6. It is a solid at room temperature, and has a high vapor pressure, easy to sublimate. The valence of chromium atom in hexacarbonyl chromium is zero. It is a homogeneous compound, all carbonyls are equivalent, its structure is octahedron, and the bond lengths of Cr-C and C-O are 1.91 and 1.14 Å, respectively