the coordination number of the lanthanides. The rather high luminescence quantum yield of the heptaeuropium complex (25%) indicates that the ring structure is well adapted to include highly luminescent lanthanide complexes in nanosized architecture. The use of a stepwise synthetic strategy leads to the selective assembly of large heteropolymetallic rings. The addition of a smaller lanthanideion to
Lanthanide Complexes Based on β-Diketonates and a Tetradentate Chromophore Highly Luminescent as Powders and in Polymers
作者:Eugen S. Andreiadis、Nicolas Gauthier、Daniel Imbert、Renaud Demadrille、Jacques Pécaut、Marinella Mazzanti
DOI:10.1021/ic402523v
日期:2013.12.16
A new type of octacoordinated ternary beta-diketonates complexes of terbium and europium has been prepared using the anionic tetradentate terpyridine-carboxylate ligand (L) as a sensitizer of lanthanide luminescence in combination with two beta-diketonates ligands 2-thenoyltrifluoroacetyl-acetonate (tta(-)) for Eu3+ and trifluoroacetylacetonate (tfac(-)) for Tb3+. The solid state structures of the two complexes [Tb(L)(tfac)(2)] (1) and [Eu(L)(tta)(2)] (2) have been determined by X-ray crystallography. Photophysical and H-1 NMR indicate a high stability of these complexes with respect to ligand dissociation in solution. The use of the anionic tetradentate ligand in combination with two beta-diketonates ligands leads to the extension of the absorption window toward the visible region (390 nm) and to high luminescence quantum yield for the europium complex in the solid state (Phi = 66(6)%). Furthermore, these complexes have been incorporated in polymer matrixes leading to highly luminescent flexible layers.
Cation-Controlled Self-Assembly of a Hexameric Europium Wheel
作者:Yann Bretonnière、Marinella Mazzanti、Jacques Pécaut、Marilyn M. Olmstead
DOI:10.1021/ja012177e
日期:2002.8.1
The simple asymmetric tetradentate ligand 2,2':6',2' '-terpyridine-6-carboxylic acid leads to the self-assembly of the first europium nanowheel containing europium ions in two different coordination environments. Moreover the self-assembly of bis(terpyridinecarboxylate) europium species to form a hexameric wheel capable of strongly binding LnIII cations is controlled by the ligand/cation ratio.
Potts, Kevin T., Bulletin des Societes Chimiques Belges, 1990, vol. 99, # 9, p. 741 - 768