Dy, Tb, Gd and Eu complexes with low melting point and magnetic behavior

Three new complexes based on lanthanide(III) tetrakis(β-diketonate) with a tetraalkylphosphonium as counterion [P6,6,6,14][Ln(NTA)4] (Ln = Dy (1), Tb (2), Gd (3); NTA = naphthoyltrifluoroacetone; P6,6,6,14 = trihexyl(tetradecyl)phosphonium) were synthesized. The complexes were fully characterized and their spectroscopic, thermal and magnetic properties were evaluated, together with the Eu (4) analogue. The Dy (1) compound showed solvatochromic properties, the Tb (2) compound presented an unprecedented solid state polymorphism never observed in an organometallic compound and all complexes presented paramagnetic behavior with no interactions between the magnetic moments.

Lanthanide based complexes with a tetrakis(β-diketonate) and a tetraalkylphosphonium cation, [P6,6,6,14][Ln(NTA)4] (Ln = Dy, Tb, Gd, Eu), presented several interesting features. The Tb compound presents an unprecedented solid state polymorphism never observed in an organometallic ionic liquid, the Dy analogue has solvatochromic properties and all the complexes have paramagnetic behavior.Figure optionsDownload as PowerPoint slide