The new nir-emitting compounds based on β-dicarbonyl ligands

Abstract

The Nd(III), Er(III) and Yb(III) complexes with allyl-3-oxobutanoate (allyl acetoacetate), 2-methyl-5-phenyl-1-penten-dione-3,5 (methacrylacetophenone) and their phenanthroline adducts were synthesized. Metallopolymers were obtained by radical polymerization. In all complexes β-dicarbonyl ligands are coordinated to central ions in a bidentate-cyclic mode. Thermal stability was shown to be higher for metallopolymers than for monomeric complexes. It was found that the displacement of water from the inner coordination environment of the Ln(III) ion and polymerization cause only minor deformation of the coordination polyhedrons, which all have non-cubic symmetry. The relative luminescence intensity of the complexes increases in the LnL3⋅2H2O < [LnL3]n < LnL3⋅Phen series. Among all studied lanthanides erbium compounds have the lowest luminescence intensity.