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

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...

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Bibliographic Details
Published in:Polyhedron 2015-05, Vol.91, p.42-46
Main Authors: Pereira, Cláudia C.L., Coutinho, Joana T., Pereira, Laura C.J., Leal, João Paulo, Laia, César A.T., Monteiro, Bernardo
Format: Article
Language:English
Subjects:
Ionic liquids
Lanthanides
Magnetism
Solid state polymorphism
Solvatochromism
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Summary: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. [Display omitted] 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.
ISSN:0277-5387
DOI:10.1016/j.poly.2015.02.026