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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 12
BKCSDE 26(12)
December 20, 2005 

 
Title
Photoluminescent Properties of Eu(III) in the Composite Heterocyclic Ligands/Crown Ether Systems
Author
Hong-Guo Liu, Kiwan Jang, Xu-Sheng Feng, Changdae Kim, Young-Jae Yoo, Yong-Ill Lee*
Keywords
Europium complex, Crown ether, Photoluminescence, Heterocyclic ligand
Abstract
Composite systems of Eu(phen)2Cl3(H2O)2, Eu(DN-bpy)phenCl3(H2O)2 and Eu(DB-bpy)phenCl3(H2O)2 (DNbpy: 4,4'-Dinonyl-2,2'-dipyridyl; DB-bpy: 4,4'-Di-tert-butyl-2,2'-dipyridyl) with crown ethers of Benzo-15- crown-5 (B15C5), Benzo-18-crown-6 (B18C6), 18-crown-6 (18C6), Dibenzo-18-crown-6 (DB18C6) and Dibenzo-24-crown-8 (DB24C8) were fabricated successfully and characterized by using photoluminescent spectroscopy and luminescent lifetime measurements. All composites formed show high luminescence mainly in red region. It was found that the heterocyclic ligands such as phen, DN-bpy and DB-bpy as well as the crown ethers have great influences on the photoluminescent properties of Eu3+ ion. The environment around Eu3+ ion in the composite systems changes greatly,presumably the variation of the first coordination sphere. The Eu3+ ion occupies higher symmetrical environment and in more than one kind of symmetrical site in the composite systems studied in this work.
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