0000000000049974

AUTHOR

Cordula Grüttner

showing 4 related works from this author

Extraction of lanthanides and actinides by a magnetically assisted chemical separation technique based on CMPO-calix[4]arenes

2001

A novel particulate system carrying CMPO ligands pre-organised on a calixarene scaffold has been synthesised and demonstrated to extract Eu3+, Am3+ and Ce3+ at high efficiency from simulated nuclear waste streams.

ChemistryExtraction (chemistry)Metals and AlloysRadioactive wasteGeneral ChemistryActinideCatalysisSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsSolventChemical separationCalixareneMaterials ChemistryCeramics and CompositesParticulate systemNuclear chemistry
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Calix[4]arenes with alkylidene bridges, synthesis and conformational properties

1994

Abstract Calix[4]arenes with one or two alkylidene bridges were synthesized by “2+2” fragment condensation. As predicted by molecular mechanics calculations aliphatic residues at the bridging carbon atom(s) prefer the equatorial position.

Carbon atomChemistryStereochemistryOrganic ChemistryDrug DiscoveryCondensationBiochemistryTetrahedron Letters
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Dendrimer-coated magnetic particles for radionuclide separation

2005

Magnetic particles were synthesised for radionuclide removal from nuclear wastes by magnetic separation. Dendrimers with terminal amino groups attached to the particle surface were used to bind chelating groups for lanthanides and actinides. This led to a 50–400-fold increase of the distribution coefficients for europium and americium in comparison to the reference particles without the dendrimers. Back-extraction studies have demonstrated the possibility of multiple particle recycling.

LanthanideIR-53099RadiochemistryMagnetic separationchemistry.chemical_elementAmericiumMETIS-225399ActinideCondensed Matter Physicsequipment and suppliesElectronic Optical and Magnetic MaterialschemistryDendrimerParticleMagnetic nanoparticlesEuropiumhuman activities
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Separation of lanthanides and actinides using magnetic silica particles bearing covalently attached tetra-CMPO-calix[4]arenes

2004

Calix[4]arene tetraethers in the cone conformation bearing four –NH–CO–CH2–P(O)Ph2 (= CMPO) residues on their wide rim and one, two or four ω-amino alkyl residues of various lengths at the narrow rim were synthesized. Reaction with dichlorotriazinyl (DCT) functionalized magnetic particles led to complete coverage of the available surface by covalently linked CMPO-calix[4]arenes in all cases. Magnetically assisted removal of Eu(III) and Am(III) from acidic solutions was distinctly more efficient with these particles in comparison to analogous particles bearing the same amount of analogous single-chain CMPO-functions. The best result, an increase of the extraction efficiency by a factor of 14…

chemistry.chemical_classificationRange (particle radiation)biologyOrganic ChemistryExtraction (chemistry)Actinidebiology.organism_classificationBiochemistrychemistryCovalent bondPolymer chemistryMagnetic nanoparticlesTetraOrganic chemistryPhysical and Theoretical ChemistrySelectivityAlkylOrg. Biomol. Chem.
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