New chelate complexes of trivalent Y and lanthanides (Eu, Ho, Yb) with a triazene N-oxide: Synthesis, structural characterization and luminescence properties

• Autor(a) principal: de Oliveira, Gelson Manzoni
• Data de Publicação: 2011
• Outros Autores: Hoerner, Manfredo, Machado, Aline, Back, Davi F., Monteiro, Jorge H. S. K. [UNESP], Davolos, Marian Rosaly [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.ica.2010.11.007; http://hdl.handle.net/11449/42542
• topic: Lanthanides(III) chelate complexes; Triazene oxides complexes of lanthanides; Luminescence of lanthanides(III) complexes

Deprotonated 3-(4-nitrophenyl)-1-phenyltriazene N-oxide reacts with YCl3 center dot 6H(2)O and LnCl(3)center dot 6H(2)O (Ln = Eu, Ho, Yb) to give the monoclinic chelate complexes [Y{O2N(C6H4)NNN(O)Ph}(4)](Et3NH)center dot H2O (1) (Ph = C6H5; Et = C2H5) and [Ln(III){O2N(C6H4)NNN(O)Ph}(4)](Et3NH)center dot H2O center dot{CH3OH*} {Ln(III) = Eu (2), Ho (3), Yb* (4), in which the metal centers present a square antiprismatic configuration. As already observed for hydrated ammonium complexes of triazene-oxides ligands with (C6H4)-NO2 groups, multiple, effective O center dot center dot center dot H and N center dot center dot center dot H interactions hold the species in supramolecular 3D assemblies. The optical and the luminescent properties of the triazene-oxide europium complex 2 are also presented and fully discussed. (C) 2010 Elsevier B.V. All rights reserved.