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The Synthesis of Dendritic β‐Diketonato Ligands and Their Europium Complexes
Author(s) -
Li BaoLin,
Liu ZiTong,
Deng GuoJun,
Fan QingHua
Publication year - 2007
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.200600583
Subject(s) - europium , dibenzoylmethane , chemistry , dendrimer , ligand (biochemistry) , luminescence , aryl , stereochemistry , photochemistry , polymer chemistry , organic chemistry , ion , biochemistry , physics , receptor , alkyl , optoelectronics
Two kinds of dendritic β‐diketonato ligands ( 1a , 1b and 2a – 2c ) which contain a dibenzoylmethane (dbm) core and poly(aryl ether) dendron, have been synthesized by a convergent strategy. The attachment point of the dendron to dbm is found to play an important role in the preparation of europium(III) complexes. Reaction of the β‐diketonato ligands 2a – 2c , which bear a dendron substituted on the phenyl group of dbm, with EuCl 3 · 6H 2 O gives the first‐ to third‐generation dendritic europium(III) complexes in good yields, while europium(III) complexes could not be formed with β‐diketonato ligands 1a and 1b , which have dendrons attached to the 2‐position of dbm. The resulting dendritic europium(III) complexes were characterized by elemental analysis and MALDI‐TOF mass spectrometry, and further confirmed by luminescence measurements. Incorporation of 1,10‐phenanthroline as the second ligand in these dendritic (β‐diketonato)europium(III) complexes gives new dendritic europium(III) complexes with enhanced luminescence intensity. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)