Synthesis, structure and luminescence studies of Eu(III), Tb(III), Sm(III), Dy(III) cationic complexes with acetylacetone and bis(5-(pyridine-2-yl)-1,2,4-triazol-3-yl)propane

Alexey N Gusev; Miki Hasegawa; Tomohito Shimizu; Tomonori Fukawa; Shoya Sakurai; Galyna A Nishchymenko; Victor F Shul'gin; Svetlana B Meshkova; Wolfgang Linert

doi:10.1016/j.ica.2013.04.006

Synthesis, structure and luminescence studies of Eu(III), Tb(III), Sm(III), Dy(III) cationic complexes with acetylacetone and bis(5-(pyridine-2-yl)-1,2,4-triazol-3-yl)propane

Inorganica Chim Acta. 2013 Sep 1;406(100):279-284. doi: 10.1016/j.ica.2013.04.006.

Authors

Alexey N Gusev¹, Miki Hasegawa, Tomohito Shimizu, Tomonori Fukawa, Shoya Sakurai, Galyna A Nishchymenko, Victor F Shul'gin, Svetlana B Meshkova, Wolfgang Linert

Affiliation

¹ Taurida National V.I. Vernadsky University, Simferopol 95007, Ukraine.

Abstract

Studies concerning synthesis, structure and luminescence of eight-coordinate Eu, Tb, Sm and Dy complexes of the type [Ln(acac)₂(L)]Cl (Hacac = pentanedione-2,4 and L = bis(5-(pyridine-2-yl)-1,2,4-triazol-3-yl)propane) are reported in detail. The obtained complexes were investigated by various means including elemental- and thermogravimetric analysis, IR- and electron transition spectroscopy. The structure of the Tb complex was determined by single-crystal X-ray crystallography: Tb is eight-coordinate, and L acting only as a tetradentate chelate together with two bidentate acac ligands. Photophysical studies of the complexes were carried out. The Tb(III) and Eu(III) complexes show strong emissions both in solid state and solution. The intensity of the luminescence of Dy(III) and Sm(III) are relatively weak. The factors determining the intensity of the photoluminescence are discussed.

Keywords: 1,2,4-Triazole derivatives; Ln complex; Luminescence; X-ray study.