text: Complexes containing CS are known but uncommon. The rarity of such complexes is partly attributable to the fact that the obvious source material, carbon monosulfide, is unstable. Thus, the synthesis of thiocarbonyl complexes requires indirect routes, such as the reaction of disodium tetracarbonylferrate with thiophosgene:
  :NaFe(CO) + CSCl → Fe(CO)CS + 2 NaCl
  Complexes of CSe and CTe have been characterized.