Highly Luminescent, Neutral, Nine‐Coordinate Lanthanide(III) Complexes

Abstract

Using a simple ligand design, we have prepared neutral, nine-coordinate lanthanide complexes that exclude water from the inner coordination sphere, thus leading to high emission quantum yields and long excited-state lifetimes. The complexes form in high synthetic yields (49-87 %) by simply mixing the ligand and the lanthanide. Visible luminescence from Eu III (Φ = 60%, τ = 2.2 ms) and Tb III (Φ = 7%,

Luminescent hybrid materials based on covalent attachment of Eu(iii)-tris(bipyridinedicarboxylate) in the mesoporous silica host MCM-41

“…19 52 mg of EuCl 3 (0.2 mmol) and 120 mg (0.6 mmol) of L 1 were dissolved in 20 mL of absolute methanol. 0.083 mL of Et 3 N was added to the mixture, which was then refluxed (60°C) under inert atmosphere (N 2 ) overnight, filtered and concentrated to 5 mL.…”

Synthesis and spectroscopy of anionic tridentate benzimidazole-pyridine carboxylate and tetrazolate chromophore ligands

“…We developed these tridentate ligands to make neutral homoleptic tris-complexes of the lanthanides. The lanthanide ion in this type of complexes is expected to be nine-coordinate [7][8][9][10][11][12]23]. We also report on the synthesis of non-symmetric pyridines P2-P4 that are 2,6-or 2,4,6-substituted with hydroxymethyl, carboxaldehyde, and carbonitrile groups (Scheme 3).…”

“…Polydentate carboxylate [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and tetrazolate [21][22][23][24] ligands are strong chelators for lanthanide ions and efficient sensitizers of their luminescence. Here, we report on synthesis and spectroscopy of anionic tridentate carboxylate and tetrazolate benzimidazole-pyridine ligands HL1-HL7 that are functionalized with chromophore and solubilizing groups (Schemes 1 and 2).…”

3-D supramolecular frameworks assembled by lanthanide binuclear molecules based on 1,2-phenylenedioxydiacetic acid and 1,10-phenanthroline

“…Lanthanide luminescence is well studied due to their sharp and intense features, particularly, europium, terbium, samarium, and dysprosium have interesting luminescent properties, such as red emission for Eu(III) ion and green emission for Tb(III) ion [7][8][9][10][11][12][13][14][15]. Currently organic acids are commonly used for preparing lanthanide complexes.…”

“…Lanthanide-based inorganic-organic complexes have been extensively studied due to their fascinating coordination geometries and special fluorescence and magnetic properties, which have potential applications in catalysis, magnetic molecular materials, luminescent label, and absorption processes [1][2][3][4][5][6][7]. Lanthanide luminescence is well studied due to their sharp and intense features, particularly, europium, terbium, samarium, and dysprosium have interesting luminescent properties, such as red emission for Eu(III) ion and green emission for Tb(III) ion [7][8][9][10][11][12][13][14][15].…”