Er(III)-chelated Prototype Complexes Based on Benzoate and Pentafluorobenzoate Ligands : Synthesis and Key Parameters for Near IR Emission Enhancement

Bulletin of the Korean chemical society

Jae Buem Oh¹  Youngil Lee¹  Hwan Kyu Kim¹  Min-Kook Nah¹  Nam Seob Baek¹  Soo-Gyun Roh¹ 

关键词: Erbium-chelated prototype complexes;    Ligand-exchange reaction;    Emission enhancement;    Planar waveguide amplifiers;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

New synthetic methodology of the saturated and unsaturated Er(III)-chelated prototype complexes based on benzoate and pentafluorobenzoate ligands was developed through ligand-exchange reaction. The saturated 8-coordinated Er(III) complexes exhibit stronger near-IR emission than those of the unsaturated 6-coordinated Er(III) complexes, obtained from the direct photoexcitation of Er ions with 488 nm. Three H2O molecules coordinated in the unsaturated 6-coordinated complexes seriously quenched the near IR emission by the harmonic vibration relaxation decay of O-H bonds. Also, the stronger emission of the Er(III) complexes was obtained by the indirect photoexcitation of ligands than by the direct photoexcitation of the Er(III) ions, due to the energy transfer between the excited ligand and the erbium ion. Furthermore, the saturated Er(III)-chelated complex with C-F bonds shows much stronger near IR emission than that of the saturated Er(III)-chelated complex with C-H bonds. It is attributed to the influence of C-F bonds on near IR emission.

【 授权许可】

Unknown