Effect of Coordination Environment on the Photophysical Properties of Luminescent Europium(III) Complexes

Bulletin of the Korean chemical society

Kang Deuk Seo¹  Hwan Kyu Kim¹  Yong Hee Kim¹  Nam Seob Baek¹  Dong Hyun Lee¹ 

关键词: Neutral ligand;    Lanthanide-cored complex;    Sensitized luminescence;    Coordination environment;    Quantum efficiency;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

A series of Eu(III) complexes with various neutral ligands (2,2�?:6�?,2"-terpyridine (T), diglyme (D), 1N-(2-dimethylamino) ethyl)-1N, 2N, 2N-trimethylethane-1,2-diamine (PT), di-(2-picolyl)-amine derivative (HT), and multidentate terpyridine derivative (DT)) were synthesized to investigate the effect of coordination environment on the sensitized luminescence of Eu(III) complexes. The nine coordination sites of the Eu³⁺ ion are occupied by three bidentate carboxylate moieties and one neutral ligand. The highest emission intensity is obtained for Eu³⁺- [NA]₃ (PT), due to the difference in energy transfer efficiency and symmetry of the first coordination sphere of Eu³⁺ ion. But, the lowest emission intensity is obtained for Eu³⁺-[NA]₃(T). Terpyridine may not play an important role antenna for photosensitizing Eu³⁺ ion. It could be attributed to the weak spectral overlap integral J value between its phosphorescence band and Eu³⁺ion absorption band. Therefore, different coordination environment of Ln³⁺ ion play an important role in providing sensitization of lanthanide ion emission.

【 授权许可】

Unknown