Structural and photophysical studies on ternary Sm(III), Nd(III), Yb(III), Er(III) complexes containing pyridyltriazole ligands

• Published in: Polyhedron 2012-10, Vol.47 (1), p.37-45
• Main Authors: Gusev, Alexey N., Shul’gin, Victor F., Meshkova, Svetlana B., Hasegawa, Miki, Alexandrov, Grigory G., Eremenko, Igor L., Linert, Wolfgang
• Format: Article
• Language: English
• Subjects: 1,2,4-Triazole derivatives; Ln(III) complex; Luminescence; X-ray study
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2012.08.034

The structure of two new ancillary triazole’s type ligands and properties of Sm(III), Nd(III), Yb(III), Er(III) complexes based on them are characterized. The factors affecting the intensity and character of the luminescence of the Ln(III) are discussed. Two bidentate pyridine-triazole ligands (3-(pyridine-2-yl)-5-phenyl-1,2,4-triazole (L1) and 5-phenyl-2-(2′-pyridyl)-7,8-benzo-6,5-dihydro-1,3,6-triazaindolizine (L2)), have been synthesized and used for Ln(Dbm)3 (Ln=Sm(III), Nd(III), Yb(III) and Er(III)) coordination. The structures of the ligands and resulting Sm(III) complex were determined in the solid state by X-ray diffraction. The title complexes were characterized by UV, fluorescent, IR-spectroscopy and thermogravimetric and elemental analyses. Photophysical studies on the Ln(III) complexes were carried out showing luminescence in the region typical for Ln(III). The effect of various factors on the enhancement luminescence of complexes is discussed.