Eleven novel ligands having picolinamide or thiopicolinamide binding groups at the upper or lower rim of calix[4]-, calix[6]- and calix[8]arenes have been synthesised. The conformational properties of some of these ligands were studied in solution by means of NMR spectroscopy and in the solid state by X-ray diffraction. Their ability to extract Am-III or Eu-III from water to NPHE (o-nitrophenyl hexyl ether) was tested at different concentrations of LiNO3, HNO3 and of a lipophilic dicarbollide anion (BrCosan). The data show a high cooperation between binding sites of the calixarene ligands in comparison to data obtained with the model ligand N-butyl picolinamide (19). Some of these ligands show very high distribution coefficients for Am3+ (D-Am > 300) and good Am/Eu selectivity at pH 3, which open up interesting perspectives for their application in the treatment of low acidity radioactive waste.

Calixarene-based picolinamide extractants for selective An/Ln separation from radioactive waste / Casnati, Alessandro; DELLA CA', Nicola; Fontanella, Marco; Sansone, Francesco; Ugozzoli, Franco; Ungaro, Rocco; K., Liger; J. F., Dozol. - In: EUROPEAN JOURNAL OF ORGANIC CHEMISTRY. - ISSN 1434-193X. - 11:(2005), pp. 2338-2348. [10.1002/ejoc.200400793]

Calixarene-based picolinamide extractants for selective An/Ln separation from radioactive waste

CASNATI, Alessandro;DELLA CA', Nicola;FONTANELLA, Marco;SANSONE, Francesco;UGOZZOLI, Franco;UNGARO, Rocco;
2005-01-01

Abstract

Eleven novel ligands having picolinamide or thiopicolinamide binding groups at the upper or lower rim of calix[4]-, calix[6]- and calix[8]arenes have been synthesised. The conformational properties of some of these ligands were studied in solution by means of NMR spectroscopy and in the solid state by X-ray diffraction. Their ability to extract Am-III or Eu-III from water to NPHE (o-nitrophenyl hexyl ether) was tested at different concentrations of LiNO3, HNO3 and of a lipophilic dicarbollide anion (BrCosan). The data show a high cooperation between binding sites of the calixarene ligands in comparison to data obtained with the model ligand N-butyl picolinamide (19). Some of these ligands show very high distribution coefficients for Am3+ (D-Am > 300) and good Am/Eu selectivity at pH 3, which open up interesting perspectives for their application in the treatment of low acidity radioactive waste.
2005
Calixarene-based picolinamide extractants for selective An/Ln separation from radioactive waste / Casnati, Alessandro; DELLA CA', Nicola; Fontanella, Marco; Sansone, Francesco; Ugozzoli, Franco; Ungaro, Rocco; K., Liger; J. F., Dozol. - In: EUROPEAN JOURNAL OF ORGANIC CHEMISTRY. - ISSN 1434-193X. - 11:(2005), pp. 2338-2348. [10.1002/ejoc.200400793]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/1445368
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