[Mn(CO)₅]⁻, the First Square‐Pyramidal Pentacarbonyl Complex in the Complex Salt [Ph₄P][Mn(CO)₅], and [Mn₃Se₂(CO)₉]²⁻, the First Mixed Carbonyl‐Selenido Complex of Manganese

Abstract

[Mn2(CO)10] disproportionates in the reaction with Na2Se in THF leading to [Mn(CO)5]− and [Mn3Se2(CO)9]2− ions. In the crystal the former has a square-pyramidal geometry, whereas the latter contains a novel asymmetric carbonyl bridge (see picture on the right), which is also present in the “King complex” [Fe3S2(CO)9][Fe2(S2)(CO)6].