A Bimetallic Complex Between Uranyl and p-tert-Butylcalix[8]arene

Thuéry, Pierre; Keller, N.; Lance, M.; Vigner, Julien; Nierlich, Martine

doi:10.1107/s0108270195000710

Cited by 22 publications

(19 citation statements)

References 6 publications

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“…In the case of U(VI) complexation by L8, the pH dependence shows the existence of the 2:1:0 complex instead of the 2:2:-3 proposed by Sonoda et al 10 . This is in agreement with the crystallographic structure obtained with the p-tert-butylcalix [8]arene where the ligands acts as a tetraanion 15 . The stability constant obtained by two independent experimental methods is lower than the one proposed by Archimbaud et al 9 and Nagasaki et al 7 Table 2).…”

Section: Discussionsupporting

confidence: 90%

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Investigation of para-sulfonatocalix[n]arenes [n = 6, 8] as potential chelates for²³⁰U

et al. 2010

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Literature reports of the efficacy of para-sulfonatocalix[6]- and calix[8]-arenes as U(vi) complexants indicated that they might be useful for in vivo chelation of the novel therapeutic alpha-emitter (230)U. We have studied the complexation of U(vi) with para-sulfonatocalix[6]arene and para-sulfonatocalix[8]arene by time resolved laser induced fluorescence spectroscopy and using competition methods with Chelex resin and 4-(2-pyridylazo)resorcinol in simplified and in biological media. New thermodynamic parameters describing the stability of U(vi)-para-sulfonatocalix[n]arene [n = 6, 8] complexes were obtained. Although the interactions are strong, the complexes do not exhibit sufficient stability to compete with carbonate ions and serum proteins for complexation of U(vi) under physiological conditions.

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Section: Discussionsupporting

confidence: 90%

“…The formation of a binuclear complex 2:1 between U(VI) and L8 has been shown in solution by a continuous variation method 7,[9][10] and has been characterized in the solid state by X-ray diffraction (XRD) with the para-tert-butyl derivative of L8 15 . This stoichiometry was therefore assumed for our calculations.…”

Section: U(vi) Complexation With L8mentioning

confidence: 99%

Investigation of para-sulfonatocalix[n]arenes [n = 6, 8] as potential chelates for²³⁰U

et al. 2010

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“…It has the same number of bonds defining the central ring as calix [7]arene and a smaller one than calix [8]arene, but, when one considers the sum of the number of phenolic and ether groups, it is equal for LH 6 and calix [8]arene and smaller for calix [7]arene. p-tert-Butylcalix [8] arene complexes two uranyl ions, each of them bound to four oxygen atoms (two phenols and two phenoxides), and bridged by a central hydroxide ion [1,2,24,25], whereas R-calix [7]arene (R ¼ tert-butyl, benzyl) complexes either one uranyl ion in its tetraphenolic subunit [9], either two uranyl ions with a UvO -U bond between them [10]. The direct bond between the two uranyl ions in the latter case can be attributed to a macrocycle size slightly too small for two independent cations.…”

Section: Tetrahomodioxacalix[6]arene Uranyl Complexes 105mentioning

confidence: 99%

A Tetrahomodioxacalix[6]arene as a Ditopic Ligand for Uranyl Ions with Carbonate or Carbamate Bridges

Masci

Thuéry

2003

Supramolecular Chemistry

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The first crystal structures of a p-tert-butyltetrahomodioxacalix[6]arene comprising two tri-phenolic subunits separated by two ether bridges and two of its complexes with uranyl ions are reported. The doubly deprotonated macrocycle assumes a much elongated, cone-like conformation including two organic species. Two binuclear uranyl complexes are described. In both, each cation is bound to the three phenoxide oxygen atoms of a triphenolic subunit and to a central, bridging, carbonate or carbamate ion. The formation of the latter ions from the amines used as bases is discussed.

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“…p ‐ tert ‐Butylcalix[8]arene (TBC[8]) is significantly more flexible than TBC[4] due to annular inversion, and metal complexes6 (TM and Ln) formed with this ligand most frequently adopt three particular conformations: pleated‐loop,6c, e, f, i, j, l, o, p, v double‐cone,6a, b, q, s–u and a third in which the molecule wraps around a small cluster in a manner akin to the shell of a tennis ball 6d. h, k–n With respect to Ln TBC[8] complexes (there are only ten in total in the Cambridge Structural Database),7 one mononuclear complex has been reported in which the calixarene adopts a pleated‐loop conformation 6o.…”

Section: Introductionmentioning

confidence: 99%

p‐tert‐Butylcalix[8]arene: An Extremely Versatile Platform for Cluster Formation

Taylor

Sanz

McIntosh

et al. 2012

Chemistry A European J

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p-tert-Butylcalix[4]arene is a bowl-shaped molecule capable of forming a range of polynuclear metal clusters under different experimental conditions. p-tert-Butylcalix[8]arene (TBC[8]) is a significantly more flexible analogue that has previously been shown to form mono- and binuclear lanthanide (Ln) metal complexes. The latter (cluster) motif is commonly observed and involves the calixarene adopting a near double-cone conformation, features of which suggested that it may be exploited as a type of assembly node in the formation of larger polynuclear lanthanide clusters. Variation in the experimental conditions employed for this system provides access to Ln(1), Ln(2), Ln(4), Ln(5), Ln(6), Ln(7) and Ln(8) complexes, with all polymetallic clusters containing the common binuclear lanthanide fragment. Closer inspection of the structures of the polymetallic clusters reveals that all but one (Ln(8)) are in fact based on metal octahedra or the building blocks of octahedra, with the identity and size of the final product dependent upon the basicity of the solution and the deprotonation level of the TBC[8] ligand. This demonstrates both the versatility of the ligand towards incorporation of additional metal centres, and the associated implications for tailoring the magnetic properties of the resulting assemblies in which lanthanide centres may be interchanged.

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A Bimetallic Complex Between Uranyl and p-tert-Butylcalix[8]arene

Cited by 22 publications

References 6 publications

Investigation of para-sulfonatocalix[n]arenes [n = 6, 8] as potential chelates for²³⁰U

Investigation of para-sulfonatocalix[n]arenes [n = 6, 8] as potential chelates for²³⁰U

A Tetrahomodioxacalix[6]arene as a Ditopic Ligand for Uranyl Ions with Carbonate or Carbamate Bridges

p‐tert‐Butylcalix[8]arene: An Extremely Versatile Platform for Cluster Formation

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A Bimetallic Complex Between Uranyl and p-tert-Butylcalix[8]arene

Cited by 22 publications

References 6 publications

Investigation of para-sulfonatocalix[n]arenes [n = 6, 8] as potential chelates for230U

Investigation of para-sulfonatocalix[n]arenes [n = 6, 8] as potential chelates for230U

A Tetrahomodioxacalix[6]arene as a Ditopic Ligand for Uranyl Ions with Carbonate or Carbamate Bridges

p‐tert‐Butylcalix[8]arene: An Extremely Versatile Platform for Cluster Formation

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Investigation of para-sulfonatocalix[n]arenes [n = 6, 8] as potential chelates for²³⁰U

Investigation of para-sulfonatocalix[n]arenes [n = 6, 8] as potential chelates for²³⁰U