Derivatives of manganese carbonyl with Bis(diphenylphosphino)methane and Bis(diphenylarsino)methane

Abstract

The reactions of manganese carbonyl with the ditertiary phosphorus ligand bis(diphenylphosphino)-methane, dpm, and its arsenic analogue, dam, have been investigated. The major products are of the types Mn₂(CO)₈(L-L), [(L-L) = dpm or dam], Mn₂(CO)₆(dpm)₂ and Mn₂(CO)₅(dpm)₂.    Mn₂(CO)₅(dpm)₂ displays a carbonyl stretch at the extremely low frequency of 1645 cm^-1. It has been shown that the molecule contains a carbonyl group bridging between the manganese atoms in a previously unknown manner.