[Mn(CO)5]-: The pentacarbonylmanganese(-I) anion (Counter cation is not shown) Reference: CCDC Structure CRTNCN01: S. Seidel, B. Schnaatz, G. HenkelAngew. Chem. Int. Ed., Vol 35, 1996, p. 1710 (published with the tetraphenylphosphonium cation not shown here)