EXAFS analysis of aqueous and acetonitrile solutions of UO2-trilate with crown-ethers and aza-crowns. Crystals structures of the inclusion complexes UO2(18-crown-6)(CF3SO3)2 and UO2(dicyclohexyl-18-crown-6)(CF3SO3)2

Deshayes, L.; Keller, N.; Lance, M.; Navaza, A.; Nierlich, Martine; Vigner, Julien

doi:10.1016/s0277-5387(00)80103-5

Cited by 43 publications

(41 citation statements)

References 13 publications

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“…To our best knowledge, there are no literature data reporting on uranyl inclusion complexes with conventional 15-crown-5. In contrary, the inclusion complexes of uranyl with 18-crown-6 have been well documented [24]. We have therefore undertaken competition experiments by adding 18-crown-6 to a solution of [(UO 2 )Cu 5 (L L-a-Leuha) 5 ] 2+ in water or in methanol.…”

Section: Stability Of Uranyl Containing 15-metallacrown-5mentioning

confidence: 99%

Pentacopper(II) complexes of α-aminohydroxamic acids: uranyl-induced conversion of a 12-metallacrown-4 to a 15-metallacrown-5

Parac‐Vogt¹,

Pacco²,

Görller‐Walrand³

et al. 2005

Journal of Inorganic Biochemistry

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Effects of uranyl on the pentacopper(II) complexes of alpha-leucinehydroxamic acid and alpha-tyrosinehydroxamic acid were studied in water and methanol by means of electrospray ionisation mass spectrometry (ES-MS), absorption spectrophotometry, circular dichroism spectroscopy and proton NMR spectroscopy. All the measurements were consistent with the complete conversion of a 12-metallacrown-4 to a 15-metallacrown-5 upon addition of one equivalent of the uranyl ion. The uranyl ion is accommodated in the cavity formed by five copper(II) ions and five alpha-aminohydroxamate ligands. The 15-metallacrown-5 inclusion complexes have a high affinity for the uranyl ion. Competition studies showed that even in the presence of a large excess of calcium(II), the 15-metallacrown-5 remained stable, and no exchange reactions between calcium(II) and uranyl were observed. Extraction of uranyl from the 15-metallacrown-5 was also not detected in the presence of a large excess of 18-crown-6. Trivalent lanthanide ions can be partially sequestered by the 15-metallacrown-5, however, even these trivalent ions are displaced by uranyl.

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Section: Stability Of Uranyl Containing 15-metallacrown-5mentioning

confidence: 99%

Pentacopper(II) complexes of α-aminohydroxamic acids: uranyl-induced conversion of a 12-metallacrown-4 to a 15-metallacrown-5

Parac‐Vogt¹,

Pacco²,

Görller‐Walrand³

et al. 2005

Journal of Inorganic Biochemistry

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“…The average U--N bond length of 2.66 (6)/k is longer than the average U--N distance of 2.54 (4)A in a uranyl pentaporphyrin complex with five N atoms equatorially bonded to the U atom (Burrel, Hemmi, Lynch & Sessler, 1991), but compares well with the average U--N distance of 2.63 (8)A in a pyrrole-derived uranyl Shift base complex where six atoms are equatorially bonded (Sessler, Mody & Lynch, 1992). The average U--N bond length, which is longer than the analogous U--O distances in similar crown ether complexes [2.51 (2)A (Navaza, Villian & Charpin, 1984) and 2.58 (7) A (Deshayes, Keller, Lance, Navaza, Nierlich & Vigner, 1993)], indicates the relative weakness of the U--N bond compared with the U--O bond.…”

Section: Commentmentioning

confidence: 90%

“…Of particular interest has been the inclusion of the uranyl ion in macrocycles; however, the majority of structural studies concern complexes in which the crown ligand is linked to the uranyl ion via hydrogen bonds (Rogers, Bond, Hippie, Rollins & Henry, 1991;Gutberlet, Dreissig, Luger, Bechthold, Maung & Knochel, 1989) and few structural studies show a direct uranyl-crown coordination (Navaza, Villain & Charpin, 1984;Dejean, Charpin, Folcher, Rigny, Navaza & Tsoucaris, 1987;Deshayes, Keller, Lance, Navaza, Nierlich & Vigner, 1993). The probability of the uranyl complexing in the crown cavity is increased by a judicious choice of the solvent-anion pair, which has to be poorly coordinating with respect to the uranyl.…”

Section: Commentmentioning

confidence: 99%

Inclusion complex between uranyl and an azacrown; structure of [UO2(18-azacrown-6)]2+.2CF3SO3−

Nierlich¹,

Sabattié²,

Keller³

et al. 1994

Acta Crystallogr C

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“…The predominant ionic character of the bonding leads to a wide variety of coordination numbers (CN) and symmetries. The uranyl ion is usually restricted to CN = 4-6 [1,13,16,57,58]. For CN = 6, due to the linearity of UO 2 2+ , the six donor atoms are usually located in the equatorial plane, but it is also common that a distorted hexagonal bipyramidal polyhedron be found with the six donor atoms arranged in a puckered fashion.…”

Section: Molecular Modellingmentioning

confidence: 99%

Uranyl complexes formed with a para-t-butylcalix[4]arene bearing phosphinoyl pendant arms on the lower rim. Solid and solution studies

Ramı́rez¹,

Varbanov

Buenzli

et al. 2012

Radiochimica Acta

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The current interest in functionalized calixarenes with phosphorylated pendant arms resides in their coordination ability towards f elements and capability towards actinide/rare earth separation. Uranyl cation forms 1 : 1 and 1 : 2 (M : L) complexes with a tetra-phosphinoylated p-tertbutylcalix[4]arene, B 4 bL 4 : UO 2 (NO 3 ) 2 (B 4 bL 4 ) n ·xH 2 O (n = 1, x = 2, 1; n = 2, x = 6, 2). Spectroscopic data point to the inner coordination sphere of 1 containing one monodentate nitrate anion, one water molecule and the four phosphinoylated arms bound to UO 2 2+ while in 2, uranyl is only coordinated to calixarene ligands. In both cases the U(VI) ion is 8-coordinate. Uranyl complexes display enhanced metal-centred luminescence due to energy transfer from the calixarene ligands; the luminescence decays are bi-exponential with associated lifetimes in the ranges 220 µs < τ s < 250 µs and 630 µs < τ L < 640 µs, pointing to the presence of two species with differently coordinated calixarene, as substantiated by a XPS study of U(4 f 5/2,7/2 ), O(1s) and P(2p) levels on solid state samples. The extraction study of UO 2 2+ cation and trivalent rare-earth (Y, La, Eu) ions from acidic nitrate media by B 4 bL 4 in chloroform shows the uranyl cation being much more extracted than rare earths.

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EXAFS analysis of aqueous and acetonitrile solutions of UO2-trilate with crown-ethers and aza-crowns. Crystals structures of the inclusion complexes UO2(18-crown-6)(CF3SO3)2 and UO2(dicyclohexyl-18-crown-6)(CF3SO3)2

Cited by 43 publications

References 13 publications

Pentacopper(II) complexes of α-aminohydroxamic acids: uranyl-induced conversion of a 12-metallacrown-4 to a 15-metallacrown-5

Pentacopper(II) complexes of α-aminohydroxamic acids: uranyl-induced conversion of a 12-metallacrown-4 to a 15-metallacrown-5

Inclusion complex between uranyl and an azacrown; structure of [UO2(18-azacrown-6)]2+.2CF3SO3−

Uranyl complexes formed with a para-t-butylcalix[4]arene bearing phosphinoyl pendant arms on the lower rim. Solid and solution studies

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