Die chemische Zersetzung von Seltenerd-Nitraten: Eine neue Methode zur Anreicherung schwerer Yttererdnitrate im kg-Ma�stab

Unfried, Peter; Rossmanith, K.

doi:10.1007/bf01045290

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…As already shown elsewhere, [36] the main difficulty encountered during the synthesis of these complexes is to avoid the formation of very stable polymeric species such as Ln(OH) 2 NO 3 , [19,30,31] LnONO 3 , [39] and Ln(OH) 3 . [40] Furthermore, the more these complexes are hydrated, the faster they hydrolyze.…”

Section: Resultsmentioning

confidence: 96%

A New Series of Anhydrous Lanthanide‐Based Octahedral Hexanuclear Complexes

et al. 2009

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Section: Resultsmentioning

confidence: 96%

A New Series of Anhydrous Lanthanide‐Based Octahedral Hexanuclear Complexes

et al. 2009

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“…Actually, polynuclear lanthanide complexes have been known for more than 20 years, , and since the pioneering work of Unfried et al − numerous such entities have been reported − ranging from tetranuclear to pentadecanuclear entities . Unfortunately most of these complexes were quite unstable and could not be used as molecular precursors for the design of supramolecular frameworks.…”

Section: Introductionmentioning

confidence: 99%

Coordination Polymers Based on Heterohexanuclear Rare Earth Complexes: Toward Independent Luminescence Brightness and Color Tuning

et al. 2013

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Reactions in solvothermal conditions between hexanuclear rare earth complexes and H2bdc, where H2bdc symbolizes terephthalic acid, lead to a family of monodimensional coordination polymers in which hexanuclear complexes act as metallic nodes. The hexanuclear cores can be either homometallic with general chemical formula [Ln6O(OH)8(NO3)6](2+) (Ln = Pr-Lu plus Y) or heterometallic with general chemical formula [Ln(6x)Ln'(6-6x)O(OH)8(NO3)6](2+) (Ln and Ln' = Pr-Lu plus Y). Whatever the hexanuclear entity is, the resulting coordination polymer is iso-structural to [Y6O(OH)8(NO3)2(bdc)(Hbdc)2·2NO3·H2bdc]∞, a coordination polymer that we have previously reported. The random distribution of the lanthanide ions over the six metallic sites of the hexanuclear entities is demonstrated by (89)Y solid state NMR, X-ray diffraction (XRD), and luminescent measurements. The luminescent and colorimetric properties of selected compounds that belong to this family have been studied. These studies demonstrate that some of these compounds exhibit very promising optical properties and that there are two ways of modulating the luminescent properties: (i) playing with the composition of the heterohexanuclear entities or (ii) playing with the relative ratio between two different hexanuclear entities. This enables the independent tuning of luminescence intensity and color.

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“…This synthetic pathway is based on a subtle balance between the various experimental parameters (pH, concentrations, temperature, etc.). The main difficulty encountered during the syntheses of these complexes is to avoid the formation of very stable polymeric species such as Ln(OH) 2 NO 3 , 27,39,40 LnONO 3 , 46 and Ln(OH) 3 . 47 Thanks to this synthetic method, numerous polymorphic phases of such hexanuclear lanthanide complexes with the general chemical formula [Ln 6 O(OH) 8 (NO 3 ) 6 (H 2 O) n ] 3 2NO 3 3 mH 2 O, with 0 e m e 6, 0 e n e 14, and Ln = Ce-Lu or Y, have been reported so far.…”

Section: ' Introductionmentioning

confidence: 99%

Unprecedented Lanthanide-Containing Coordination Polymers Constructed from Hexanuclear Molecular Building Blocks: {[Ln₆O(OH)₈](NO₃)₂(bdc)(Hbdc)₂·2NO₃·H₂bdc}_∞

Calvez¹,

Daiguebonne²,

Guillou³

2011

Inorg. Chem.

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Reactions in acetonitrile between 1,4-benzene-dicarboxylic acid (C(8)H(6)O(4)) and a hexanuclear complex of lanthanide [Ln(6)O(OH)(8)(NO(3))(6)·2NO(3)] with Ln = Y or Tb lead to 1D-coordination polymers with the general chemical formula {[Ln(6)O(OH)(8)](NO(3))(2)(bdc)(Hbdc)(2)·2NO(3)·H(2)bdc}(∞) where H(2)bdc stands for 1,4-benzene-dicarboxylic acid (or terephthalic acid). These two compounds are isostructural. The crystal structure has been solved on the basis of the X-ray powder diffraction diagram of the Y-containing compound. This compound crystallizes in the triclinic system, space group P1 (no. 2) with a = 10.4956(6) Å, b = 11.529(2) Å, c = 12.357(2) Å, α = 86.869(9)°, β = 114.272(6)°, γ = 71.624(7)°, V = 1264.02 Å(3), and Z = 2. The crystal structure can be described as the juxtaposition of linear chains of hexanuclear entities linked to each other by terephthalate ligands. Two additional partially protonated terephthalate ligands spreading laterally to the chain are bound to each hexanuclear entity. Another diprotonated terephthalic ligand and two nitrate ions ensuring the electroneutrality of the crystal structure lie in the interchain space. These two compounds are thermally stable until 200 °C. Thanks to a so-called antenna effect, the Tb-containing compound, despite short intermetallic distances, exhibits a strong luminescence under UV irradiation.

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Die chemische Zersetzung von Seltenerd-Nitraten: Eine neue Methode zur Anreicherung schwerer Yttererdnitrate im kg-Ma�stab

Cited by 17 publications

References 5 publications

A New Series of Anhydrous Lanthanide‐Based Octahedral Hexanuclear Complexes

A New Series of Anhydrous Lanthanide‐Based Octahedral Hexanuclear Complexes

Coordination Polymers Based on Heterohexanuclear Rare Earth Complexes: Toward Independent Luminescence Brightness and Color Tuning

Unprecedented Lanthanide-Containing Coordination Polymers Constructed from Hexanuclear Molecular Building Blocks: {[Ln₆O(OH)₈](NO₃)₂(bdc)(Hbdc)₂·2NO₃·H₂bdc}_∞

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Die chemische Zersetzung von Seltenerd-Nitraten: Eine neue Methode zur Anreicherung schwerer Yttererdnitrate im kg-Ma�stab

Cited by 17 publications

References 5 publications

A New Series of Anhydrous Lanthanide‐Based Octahedral Hexanuclear Complexes

A New Series of Anhydrous Lanthanide‐Based Octahedral Hexanuclear Complexes

Coordination Polymers Based on Heterohexanuclear Rare Earth Complexes: Toward Independent Luminescence Brightness and Color Tuning

Unprecedented Lanthanide-Containing Coordination Polymers Constructed from Hexanuclear Molecular Building Blocks: {[Ln6O(OH)8](NO3)2(bdc)(Hbdc)2·2NO3·H2bdc}∞

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Unprecedented Lanthanide-Containing Coordination Polymers Constructed from Hexanuclear Molecular Building Blocks: {[Ln₆O(OH)₈](NO₃)₂(bdc)(Hbdc)₂·2NO₃·H₂bdc}_∞