Site-specific ligand variation in manganese–oxide cubane complexes, and unusual magnetic relaxation effects in [Mn4O4X(OAc)3(dbm)3](X = N3–, OCN– Hdbm = dibenzoylmethane)

Abstract

Treatment of [Mr₄O₂(OAc)₆(py)₂(dbm)₂]1(py = pyridine, Hdbm = dibenzoylmethane) in hot MeCN with Me₃SiX (X = N₃^–, OCN ^–) yields [Mn₄O₃X(OAc)3(dbm)₃] containing extremely rare η¹, µ₃-N₃^– or -OCN^– groups; alternating-current magnetic susceptibility studies reveal unusual magnetic relaxation effects and indicate these species to be the newest and smallest examples yet of truly molecular magnets.