Cyano-Bridged d–f Ensembles of the Dysprosium Tetrapyridine Complexes with the Hexacyanoferrate Anion

Resumo

The reactions of DyX₃ · 6H₂O (X = NCS, Cl) with 2,2':6',2''-terpyridine (Terpy) and K₃Fe(CN)₆ in aqueous-alcohol solutions afford cyano-bridged ensembles [Dy(Terpy)(H₂O)₃Fe(CN)₆] · nH₂O, [Dy₂(Terpy)₂(H₂O)₃(CO₃)(NCS)Fe(CN)₆] · 4H₂O, and [Dy₂(Terpy)₂(H₂O)₄(CO₃)(NCS)Fe(CN)₆] · 11.4H₂O. The compounds obtained are identified by the data of elemental analysis, IR spectroscopy, X-ray diffraction analysis, and X-ray structure analysis (CIF files CCDC nos. 1827138–1827140). The study of the magnetic properties of complex [Dy(Terpy)(H₂O)₃Fe(CN)₆] · nH₂O shows the low-spin state of Fe³⁺. The dynamic magnetic behavior of this complex exhibits a slow magnetic relaxation.