Syntheses, crystal structures and near-infrared luminescent properties of holmium (Ho) and praseodymium (Pr) ternary complexes

• Published in: Inorganic chemistry communications Vol. 11; no. 5; pp. 531 - 534
• Main Authors: Dang, Song, Sun, Li-Ning, Song, Shu-Yan, Zhang, Hong-Jie, Zheng, Guo-Li, Bi, Yan-Feng, Guo, Hua-Dong, Guo, Zhi-Yong, Feng, Jing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2008
• Subjects: dbm; NIR luminescence; Ternary complexes; Pr; NIR luminescence; Ternary complexes; dbm; Ho
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2008.02.001

A series of near-infrared (NIR) luminescent complexes Ln(dbm)3L (Ln=Ho, Pr) were firstly synthesized and their elemental analyses, crystal structures, fluorescence spectra and thermogravimetric analyses were successfully investigated. After ligand-mediated excitation of the complexes, they all show the characteristic NIR luminescence of the corresponding Ln3+ ions. A series of near-infrared (NIR) luminescent complexes Ho(dbm)3L and Pr(dbm)3L [where dbm=dibenzoylmethane; L=1,10-phenanthroline (phen), 2,2′-bipyridine (bipy), or triphenyl phosphate oxide (TPPO)] were synthesized. Their elemental analyses, crystal structures, fluorescence spectra and luminescent lifetimes were successfully investigated. After ligand-mediated excitation of the complexes, they all show the characteristic NIR luminescence of the corresponding Ln3+ ions (Ln=Ho, Pr), which can be attributed to efficient energy transfer from the ligands to the central Ln3+ ions, an antenna effect.