The synthesis of dinuclear molecular complexes [Eu-2(dbm)(6)(bipyMO)(2)], 1, [Tb-2(dbm)(6)(bipyMO)(2)], 2, [Eu-2(tta) 6( bipyMO)(2)], 3 [Eu-2(hfac)(6)(bipyMO)(3)], 4, [Tb-2(hfac)(6)(bipyMO)(3)], 5 is here reported (bipyMO = 4,4'-bipyridine N-oxide, Hdbm = dibenzoylmethane, Htta = thenoyltrifluoroacetone, Hhfac = hexafluoroacetylacetone). The products were obtained in mild conditions and with high yields reacting anhydrous lanthanide beta-diketonates and bipyMO in 1:1 or 1.5 molar ratio in toluene. X-ray single crystal studies on 2, 3, 4 showed that the heterotopic ligands are hypodentate, bridging the two lanthanide centres exclusively through the oxygen atom. Photoluminescence studies show bright red emissions from europium derivatives with absolute quantum yields up to 44 %.
Homodinuclear Lanthanide Complexes with the Divergent Heterotopic 4, 4′‐Bipyridine N‐Oxide (bipyMO) Ligand
ARMELAO L
2018
Abstract
The synthesis of dinuclear molecular complexes [Eu-2(dbm)(6)(bipyMO)(2)], 1, [Tb-2(dbm)(6)(bipyMO)(2)], 2, [Eu-2(tta) 6( bipyMO)(2)], 3 [Eu-2(hfac)(6)(bipyMO)(3)], 4, [Tb-2(hfac)(6)(bipyMO)(3)], 5 is here reported (bipyMO = 4,4'-bipyridine N-oxide, Hdbm = dibenzoylmethane, Htta = thenoyltrifluoroacetone, Hhfac = hexafluoroacetylacetone). The products were obtained in mild conditions and with high yields reacting anhydrous lanthanide beta-diketonates and bipyMO in 1:1 or 1.5 molar ratio in toluene. X-ray single crystal studies on 2, 3, 4 showed that the heterotopic ligands are hypodentate, bridging the two lanthanide centres exclusively through the oxygen atom. Photoluminescence studies show bright red emissions from europium derivatives with absolute quantum yields up to 44 %.
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