Formation constants of some rare-earth complexes

Stagg, William Ray

doi:10.31274/rtd-180814-1881

Cited by 2 publications

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“…Choppin and co-workers, who extensively studied the complexation of Ln(III) by small aromatic acids, including nitrobenzoic acid, reported only stability constants obtained through potentiometry and calorimetry, but no solid-state structural characterization and no luminescence . Similarly, Ferenc and co-workers characterized complexes of lanthanides with nitrobenzoic acid derivatives by TGA and IR spectroscopy, but no X-ray single-crystal diffraction and no emission behavior were reported. − In fact, compared to other ligand systems, fewer carboxylato complexes have been characterized by single-crystal X-ray diffraction and solution speciation and spectroscopy, mostly because of the low inherent solubility of this type of complex and the difficulty in isolating good quality crystals. − However, because of the potential fields of application of these complexes, such studies are of interest.…”

Section: Introductionmentioning

confidence: 99%

Eu(III) and Tb(III) Luminescence Sensitized by Thiophenyl-Derivatized Nitrobenzoato Antennas

2006

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Thiophenyl-derivatized nitrobenzoic acid ligands have been evaluated as possible sensitizers of Eu(III) and Tb(III) luminescence. The resulting solution and solid-state species were isolated and characterized by luminescence spectroscopy and X-ray crystallography. The Eu(III) complex with 2-nitro-3-thiophen-3-yl-benzoic acid, 1, crystallizes in the monoclinic space group C2/c with a = 28.569(3) A, b = 17.7726(18) A, c = 17.7073(18) A, beta= 126.849(2) degrees, and V = 7194.6(13) A3. The Tb(III) complex with this ligand, 2, is isostructural, and its cell parameters are a = 29.755(6) A, b = 18.123(4) A, c = 19.519(4) A, beta= 130.35(3) degrees, and V = 8021(3) A3. Eu(III) crystallizes with 3-nitro-2-thiophen-3-yl-benzoic acid as a triclinic complex, 3, in the space group P1 with a = 11.045(2) A, b = 12.547(3) A, c = 15.500(3) A, alpha = 109.06(3)degrees, beta = 94.79(3) degrees, gamma = 107.72(3) degrees. and V = 1893.5(7) A3. With the ligand 5-nitro-2-thiophen-3-yl-benzoic acid, Eu(III) yields another molecular compound, 4, triclinic P1, with a = 10.649(2) A, b = 14.009(3) A, c = 15.205(3) A, alpha= 112.15(3) degrees, beta = 100.25(3) degrees, gamma = 106.96(3) degrees, and V = 1900.5(7) A3. All compounds dissolve in water and methanol, and the methanolic solutions are luminescent. The solution species have a metal ion-to-ligand ratio of 1:1. The quantum yields have been determined to be in the range of 0.9-3.1% for Eu(III) and 4.7-9.8% for Tb(III). The highest values of these correspond to the most intense luminescence reported for Ln(III) solutions with this type of sensitizer. The lifetimes of luminescence are in the range of 248.3-338.9 micros for Eu(III) and 208.6-724.9 micros for Tb(III). The stability constants are in the range of log 11 = 2.73-4.30 for Eu(III) and 3.34-4.18 for Tb(III) and, along with the energy migration pathways, are responsible for the reported efficiency of sensitization.

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Section: Introductionmentioning

confidence: 99%

Eu(III) and Tb(III) Luminescence Sensitized by Thiophenyl-Derivatized Nitrobenzoato Antennas

2006

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“…A similar check was made by @tagg in the case ® of a monobasic acid in which case no polynuclear coordination was observed (14). The dibasic acids used in this research were considered sufficiently diffe~¥~ow~a~t a separate evaluation.…”

Section: ('Cmentioning

confidence: 76%

Stabilities of some rare-earth malonato chelate species in aqueous and methyl alcohol solution

Johnson

1971

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Formation constants of some rare-earth complexes

Cited by 2 publications

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Eu(III) and Tb(III) Luminescence Sensitized by Thiophenyl-Derivatized Nitrobenzoato Antennas

Eu(III) and Tb(III) Luminescence Sensitized by Thiophenyl-Derivatized Nitrobenzoato Antennas

Stabilities of some rare-earth malonato chelate species in aqueous and methyl alcohol solution

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