Europium(II) Compounds: Simple Synthesis of a Molecular Complex in Water and Coordination Polymers with 2,2'-Bipyrimidine Mediated Ferromagnetic Interactions

Abstract : Reaction between EuCl2 and 2,2'-bipyrimidine (bpm) in de-oxygenated water afforded a cationic molecular complex [EuCl(bpm)2(H2O)4][Cl]∙H2O (1). When performed in an organic solvent such as THF or methanol, the same reaction yielded a 3-dimensional coordination polymer of formula [EuCl2(bpm)(MeOH)0.5] (2) in which both bpm and the chloride ions act as linkers between the Eu(II) ions. Upon replacing Cl- by I-, two coordination polymers of formula {[Eu(bpm)2(H2O)3][I]2*0.5bpm}∞ (3) and {[Eu(I)(bpm)(MeOH)]- [I]}∞ (4) were obtained from reaction in water and methanol, respectively. All these compounds were characterized by X-ray crystallography. Investigations of the magnetic properties revealed a weak antiferromagnetic coupling in 2, while 3 and 4 showed a weak ferromagnetic coupling at low temperature.
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Gaël Zucchi, Pierre Thuéry, Eric Rivière, M. Ephritikhine. Europium(II) Compounds: Simple Synthesis of a Molecular Complex in Water and Coordination Polymers with 2,2'-Bipyrimidine Mediated Ferromagnetic Interactions. Chemical Communications, Royal Society of Chemistry, 2010, 46, pp.9143. ⟨10.1039/c0cc02539a⟩. ⟨hal-00843060⟩

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