摘要:
Novel europium (III) complexes of the formulae Eu(OHAP)(3)center dot 2H(2)O, Eu(OHAP)(3)Phen, Eu-2(DAR)(3)center dot 4H(2)O and Eu-2(DAR)(3)Phen(2) (HOHAP = 2'-hydroxyacetophenone, H(2)DAR = 4,6-diacetylresorcinol, Phen = 1,10-phenanthroline) have been designed and synthesized in this paper. These complexes were characterized by elemental analysis, FT-IR, and UV-vis. Based on these observations, the ligands are coordinated to Eu(III) via the acetyl and phenolic oxygens, and H(2)DAR is concluded to be bis-bidentate donor. Photoluminescence studies showed that the several complexes emitted red luminescence. Thermo-gravi metric analysis showed that the complexes possess good thermal stability. Also, it was found that Phen as a synergic ligand, coordinated to Eu(III) in a composite system like 2'-hydroxyacetophenone and 4,6-diacetylresorcinol, could enhance the complexes luminescence intensity, quantum yield and lifetime. (c) 2007 Elsevier B.V. All rights reserved.