Oxidative isomerisation as a probe of mixed valency in cyanide-bridged dimanganese carbonyl phosphine complexes

The isomeric trans,trans- and cis,trans-[Mn2]2+-containing monocations (3+) and (4+) are oxidised to the trapped valence [Mn2]3+ dications (32+) and (42+); the oxidative isomerisation of (5+) to (32+) results from intramolecular electron transfer within (52+)