Influence of the N-[methylpyridyl]acetamide ligands on the photoluminescent properties of Eu(III)-perchlorate complexes |
| |
| Affiliation: | 1. Departamento de Quı́mica, CCEN, Universidade Federal da Paraı́ba, C.P. 5093, 58059-900 João Pessoa, PB, Brazil;2. Departamento de Quı́mica Fundamental, Instituto de Quı́mica, Universidade de São Paulo, C.P. 26077 São Paulo, SP, Brazil;3. Departamento de Quı́mica Fundamental CCEN, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil;1. Laboratory of Infrared Material and Devices, The Research Institute of Advanced Technologies, College of Information Science and Engineering, Ningbo University, Ningbo 315211, China;2. Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo 315211, China;3. Nanhu College, Jiaxing University, Jiaxing 314001, China;1. Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University, Makkah Almukaramah 715, Saudi Arabia;2. Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt;1. Department of Nanomechatronics Engineering, Pusan National University, 50 Cheonghak-ri, Miryang, Gyeongnam 627-706, Korea;2. Department of Materials Science and Engineering, Korea National University of Transportation, Chungju, Chungbuk 380-702, Korea |
| |
| Abstract: | This work reports the synthesis, characterization and spectroscopic studies of Eu(III)-perchlorate complexes with amide ligands derived from N-[x-methylpyridyl]acetamide where x=3, 4 and 6. The Eu(ClO4)33(x-mpa) complexes were characterized by elemental analyses, molar conductance, TG analyses and vibrational spectroscopy. Raman and infrared data show that the perchlorate ion, (ClO4 −), is bonded to Eu(III) as a monodentate ligand and that in these three complexes water molecules are not coordinated to the rare earth ion. The profiles of the emission spectra of the complexes with 3- and 4-mpa ligands are very similar but they differ from the complex containing 6-mpa ligand. This spectroscopic behavior can be rationalized in terms of the Ωλ (λ=2 and 4) and R02 experimental intensity parameters. The values of Ω2 (∼6.5×10−20 cm2) in these complexes are smaller than in Eu(III)-TTA compounds (Ω2∼35.0×10−20 cm2), indicating that in the former case the rare earth ion is in a chemical environment less polarizable. Lifetime and emission quantum efficiency measurements for the emitting level 5D0 were carried out and the results are discussed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
