Synthesis, crystal structure and luminescence properties of a saturated dimeric Er(III)-chelated complex based on benzoate and bipyridine ligands

• Published in: Polyhedron 2005-01, Vol.24 (1), p.137-142
• Main Authors: Roh, Soo-Gyun, Nah, Min-Kook, Oh, Jae Buem, Baek, Nam Seob, Park, Ki-Min, Kim, Hwan Kyu
• Format: Article
• Language: English
• Subjects: Crystal structure; Dimeric lanthanide complex; Erbium complex; Photophysical properties; Planar waveguide amplifiers
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2004.10.014

An Er(III)-chelated complex exhibits a strong intensity NIR emission around 1.53 μm. It can be attributed to an efficient energy transfer between organic ligand and Er ion, since there is a spectral overlap between the emission band of the organic ligands and the absorption bands of the Er ion. New saturated dimeric Er(III)-chelated model complexes based on benzoate and bipyridine ligands were synthesized through a ligand-exchange reaction in the presence of the Er(III) ion and potassium benzoate salts. The crystal structure of the novel 8-coordinated dimeric complex, [Er 2(benzoate) 6(bipyridine) 2], involving four bridging and two chelating benzoate ligands and two bipyridine ligands, was determined by X-ray crystal structure analysis. The dimeric Er(III)-chelated complex has an asymmetric unit with a Er(1)–Er(2) distance of 4.33 Å and its crystal exhibited a very strong intensity near-IR emission, taking place from the first excited state ( 4I 13/2) to the ground state ( 4I 15/2) in the region of 1.53 μm.