Lanthanide complexes with oxygen bridges as models for potential up-conversion materials

• Published in: Inorganica Chimica Acta Vol. 483; pp. 379 - 385
• Main Authors: Balashova, Tatyana V., Ilichev, Vasily A., Grishin, Ivan D., Rumyantcev, Roman V., Fukin, Georgy K., Bochkarev, Mikhail N.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2018; Elsevier Science Ltd
• Subjects: 2-(2-benzothiazolyl)phenolate; 2-(2-benzoxazolyl)phenolate; Bridges; Chemical synthesis; Complexes; Energy transfer; Erbium; Lanthanides; Ligands; Reagents; Up-conversion; Up-converters; Upconversion; Ytterbium; 2-(2-benzothiazolyl)phenolate; Lanthanides; Complexes; Energy transfer; Up-conversion; 2-(2-benzoxazolyl)phenolate
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2018.08.041

[Display omitted] •Lanthanide clusters with oxygen bridges have been synthesized.•These clusters contain chelate heterocyclic phenoxy ligands.•Ln3+ ions in the clusters are bonded by μ2-O, μ3-O and μ4-O oxygens.•Yb-containing clusters show near-infrared metal centered PL. In the search for a way to organic up-converter materials the complex [(OON)2Er(THF)](μ-O)[(OON)2Yb(THF)] with the (benzoxazol-2-yl)phenolate (OON) ligand was synthesized. Upon excitation by laser with λex 405 nm light the complex displayed only emission of the Yb3+ ion indicating the lack of energy transfer from Yb to Er. To develop a method for preparation of other up-converter materials the complexes [Yb4(SON)8(μ4-O)(OH)2 and [Eu4(OON)10Li2(3-O)2] with (benzothiazol-2-yl)phenolate (SON) and (benzoxazol-2-yl)phenolate ligands were synthesized using water as a co-reagent. The X-ray study revealed that the clusters contain μ2-O, μ3-O and μ4-O bridges and short Ln…Ln contacts. These modelling syntheses showed that the method is applicable for preparation of potential up-convertion materials with Ln-O-Ln’ groupings.