Unexpected Appearance of Molecular Ferromagnetism in the Ordinary Acetate [{Gd(OAc)3(H2O)2}2]⋅4 H2O

Breaking the law: Whereas antiferromagnetic interactions in crystalline carboxylates of lanthanides are often observed, ferromagnetism is unknown. The first example of a ferromagnetic interaction is observed for a crystalline sample of the gadolinium compound [{Gd(OAc)3(H2O)2}2]⋅4 H2O (see picture Gd: gray, O: red).