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Low-percentage Ln3+ doping in a tetranuclear lanthanum polyoxometalate assembled from [Mo7O24]6- polyanions yielding visible and near-infrared luminescence

Anna Kaczmarek (UGent) , Kristof Van Hecke (UGent) and Rik Van Deun (UGent)
(2017) INORGANIC CHEMISTRY. 56(6). p.3190-3200
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Abstract
A rare case of low-percentage trivalent lanthanide doping in multinuclear lanthanide polyoxometalates (LnPOMs) was investigated. The [La-4(MoO4) (H2O)(16-) (Mo7O24)(4)](14-) polyanion was chosen as the host material for this study. In this polyanion the central [La-4(MoO4)](10+) core is coordinated by four heptamolybdate groups as well as 16 water molecules. The tetranuclear lanthanum POM was doped with 5% of Eu3+, Tb3+, Sm3+, Dy3+, Nd3+, Er3+, and Yb3+ (according to synthesis), and the structures and luminescence properties of the x%Ln:LaPOMs were investigated. Additionally a series of tetranuclear lanthanide POMs built from [Mo7O24](6-) heptamolybdate polyanions with Eu3+, Tb3+, Sm3+, Dy3+, and Nd3+ instead of La3+ were synthesized, and a detailed analysis revealed that the tetranuclear clusters formed monomers or dimers linked through oxygen bridges. The smaller lanthanide ions, namely, Er3+ and Yb3+, did not form tetranuclear clusters, but instead mononuclear sandwich-type POMs were obtained. The obtained structures were shown to be lanthanide-specific, and not a result of different synthetic/crystallization conditions. The luminescence properties of the x%Ln:LaPOMs were compared with the luminescence properties of the LnPOMs.
Keywords
PHOTOLUMINESCENCE, CHEMISTRY, PHOSPHORS, COMPLEX, ACID, EU3+

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MLA
Kaczmarek, Anna, et al. “Low-Percentage Ln3+ Doping in a Tetranuclear Lanthanum Polyoxometalate Assembled from [Mo7O24]6- Polyanions Yielding Visible and near-Infrared Luminescence.” INORGANIC CHEMISTRY, vol. 56, no. 6, 2017, pp. 3190–200.
APA
Kaczmarek, A., Van Hecke, K., & Van Deun, R. (2017). Low-percentage Ln3+ doping in a tetranuclear lanthanum polyoxometalate assembled from [Mo7O24]6- polyanions yielding visible and near-infrared luminescence. INORGANIC CHEMISTRY, 56(6), 3190–3200.
Chicago author-date
Kaczmarek, Anna, Kristof Van Hecke, and Rik Van Deun. 2017. “Low-Percentage Ln3+ Doping in a Tetranuclear Lanthanum Polyoxometalate Assembled from [Mo7O24]6- Polyanions Yielding Visible and near-Infrared Luminescence.” INORGANIC CHEMISTRY 56 (6): 3190–3200.
Chicago author-date (all authors)
Kaczmarek, Anna, Kristof Van Hecke, and Rik Van Deun. 2017. “Low-Percentage Ln3+ Doping in a Tetranuclear Lanthanum Polyoxometalate Assembled from [Mo7O24]6- Polyanions Yielding Visible and near-Infrared Luminescence.” INORGANIC CHEMISTRY 56 (6): 3190–3200.
Vancouver
1.
Kaczmarek A, Van Hecke K, Van Deun R. Low-percentage Ln3+ doping in a tetranuclear lanthanum polyoxometalate assembled from [Mo7O24]6- polyanions yielding visible and near-infrared luminescence. INORGANIC CHEMISTRY. 2017;56(6):3190–200.
IEEE
[1]
A. Kaczmarek, K. Van Hecke, and R. Van Deun, “Low-percentage Ln3+ doping in a tetranuclear lanthanum polyoxometalate assembled from [Mo7O24]6- polyanions yielding visible and near-infrared luminescence,” INORGANIC CHEMISTRY, vol. 56, no. 6, pp. 3190–3200, 2017.
@article{8514794,
  abstract     = {A rare case of low-percentage trivalent lanthanide doping in multinuclear lanthanide polyoxometalates (LnPOMs) was investigated. The [La-4(MoO4) (H2O)(16-) (Mo7O24)(4)](14-) polyanion was chosen as the host material for this study. In this polyanion the central [La-4(MoO4)](10+) core is coordinated by four heptamolybdate groups as well as 16 water molecules. The tetranuclear lanthanum POM was doped with 5% of Eu3+, Tb3+, Sm3+, Dy3+, Nd3+, Er3+, and Yb3+ (according to synthesis), and the structures and luminescence properties of the x%Ln:LaPOMs were investigated. Additionally a series of tetranuclear lanthanide POMs built from [Mo7O24](6-) heptamolybdate polyanions with Eu3+, Tb3+, Sm3+, Dy3+, and Nd3+ instead of La3+ were synthesized, and a detailed analysis revealed that the tetranuclear clusters formed monomers or dimers linked through oxygen bridges. The smaller lanthanide ions, namely, Er3+ and Yb3+, did not form tetranuclear clusters, but instead mononuclear sandwich-type POMs were obtained. The obtained structures were shown to be lanthanide-specific, and not a result of different synthetic/crystallization conditions. The luminescence properties of the x%Ln:LaPOMs were compared with the luminescence properties of the LnPOMs.},
  author       = {Kaczmarek, Anna and Van Hecke, Kristof and Van Deun, Rik},
  issn         = {0020-1669},
  journal      = {INORGANIC CHEMISTRY},
  keywords     = {PHOTOLUMINESCENCE,CHEMISTRY,PHOSPHORS,COMPLEX,ACID,EU3+},
  language     = {eng},
  number       = {6},
  pages        = {3190--3200},
  title        = {Low-percentage Ln3+ doping in a tetranuclear lanthanum polyoxometalate assembled from [Mo7O24]6- polyanions yielding visible and near-infrared luminescence},
  url          = {http://dx.doi.org/10.1021/acs.inorgchem.6b02130},
  volume       = {56},
  year         = {2017},
}

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