Ionizable (this)calix(4)crowns as highly selective 226RA2+ ionophores

F.W.B. van Leeuwen, H. Beijleveld, Cornelis J.H. Miermans, Jurriaan Huskens, Willem Verboom, David Reinhoudt

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18 Citations (Scopus)

Abstract

The 226Ra2+ selectivity of the ionizable (thia)calix[4]crowns 1-4 was determined in the presence of a large excess of the most common alkali and alkaline earth cations. Selective 226Ra2+ (2.9 × 10-8 M) extraction occurs even at extremely high Mn+/226Ra2+ ratios of 3.5 × 107 [Mn+ = Na+, K+, Rb+, Cs+, Mg2+, Ca2+, and Sr2+ (1 M)] and an ionophore concentration of 10-4 M. The selectivity coefficients log(KRaex/KMex) are ~3.5 for Mg2+, Ca2+, and Sr2+. In the presence of Ba2+, which has very similar chemical properties, only the thiacalix[4]crown-6 derivative 4 showed a selectivity for 226Ra2+. In addition to the remarkable 226Ra2+ selectivities, the effective pH range (pH 8-13) of the thiacalix[4]crown dicarboxylic acids (3 and 4) allows for full regeneration of the ionophores at lower pH values (pH <6).
Original languageEnglish
Pages (from-to)4611-4617
JournalAnalytical chemistry
Volume77
Issue number14
DOIs
Publication statusPublished - 2005

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Ionophores
Dicarboxylic Acids
Alkalies
Chemical properties
Cations
Earth (planet)
Derivatives

Cite this

van Leeuwen, F.W.B. ; Beijleveld, H. ; Miermans, Cornelis J.H. ; Huskens, Jurriaan ; Verboom, Willem ; Reinhoudt, David. / Ionizable (this)calix(4)crowns as highly selective 226RA2+ ionophores. In: Analytical chemistry. 2005 ; Vol. 77, No. 14. pp. 4611-4617.
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title = "Ionizable (this)calix(4)crowns as highly selective 226RA2+ ionophores",
abstract = "The 226Ra2+ selectivity of the ionizable (thia)calix[4]crowns 1-4 was determined in the presence of a large excess of the most common alkali and alkaline earth cations. Selective 226Ra2+ (2.9 × 10-8 M) extraction occurs even at extremely high Mn+/226Ra2+ ratios of 3.5 × 107 [Mn+ = Na+, K+, Rb+, Cs+, Mg2+, Ca2+, and Sr2+ (1 M)] and an ionophore concentration of 10-4 M. The selectivity coefficients log(KRaex/KMex) are ~3.5 for Mg2+, Ca2+, and Sr2+. In the presence of Ba2+, which has very similar chemical properties, only the thiacalix[4]crown-6 derivative 4 showed a selectivity for 226Ra2+. In addition to the remarkable 226Ra2+ selectivities, the effective pH range (pH 8-13) of the thiacalix[4]crown dicarboxylic acids (3 and 4) allows for full regeneration of the ionophores at lower pH values (pH <6).",
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Ionizable (this)calix(4)crowns as highly selective 226RA2+ ionophores. / van Leeuwen, F.W.B.; Beijleveld, H.; Miermans, Cornelis J.H.; Huskens, Jurriaan; Verboom, Willem; Reinhoudt, David.

In: Analytical chemistry, Vol. 77, No. 14, 2005, p. 4611-4617.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Ionizable (this)calix(4)crowns as highly selective 226RA2+ ionophores

AU - van Leeuwen, F.W.B.

AU - Beijleveld, H.

AU - Miermans, Cornelis J.H.

AU - Huskens, Jurriaan

AU - Verboom, Willem

AU - Reinhoudt, David

PY - 2005

Y1 - 2005

N2 - The 226Ra2+ selectivity of the ionizable (thia)calix[4]crowns 1-4 was determined in the presence of a large excess of the most common alkali and alkaline earth cations. Selective 226Ra2+ (2.9 × 10-8 M) extraction occurs even at extremely high Mn+/226Ra2+ ratios of 3.5 × 107 [Mn+ = Na+, K+, Rb+, Cs+, Mg2+, Ca2+, and Sr2+ (1 M)] and an ionophore concentration of 10-4 M. The selectivity coefficients log(KRaex/KMex) are ~3.5 for Mg2+, Ca2+, and Sr2+. In the presence of Ba2+, which has very similar chemical properties, only the thiacalix[4]crown-6 derivative 4 showed a selectivity for 226Ra2+. In addition to the remarkable 226Ra2+ selectivities, the effective pH range (pH 8-13) of the thiacalix[4]crown dicarboxylic acids (3 and 4) allows for full regeneration of the ionophores at lower pH values (pH <6).

AB - The 226Ra2+ selectivity of the ionizable (thia)calix[4]crowns 1-4 was determined in the presence of a large excess of the most common alkali and alkaline earth cations. Selective 226Ra2+ (2.9 × 10-8 M) extraction occurs even at extremely high Mn+/226Ra2+ ratios of 3.5 × 107 [Mn+ = Na+, K+, Rb+, Cs+, Mg2+, Ca2+, and Sr2+ (1 M)] and an ionophore concentration of 10-4 M. The selectivity coefficients log(KRaex/KMex) are ~3.5 for Mg2+, Ca2+, and Sr2+. In the presence of Ba2+, which has very similar chemical properties, only the thiacalix[4]crown-6 derivative 4 showed a selectivity for 226Ra2+. In addition to the remarkable 226Ra2+ selectivities, the effective pH range (pH 8-13) of the thiacalix[4]crown dicarboxylic acids (3 and 4) allows for full regeneration of the ionophores at lower pH values (pH <6).

U2 - 10.1021/ac050524n

DO - 10.1021/ac050524n

M3 - Article

VL - 77

SP - 4611

EP - 4617

JO - Analytical chemistry

JF - Analytical chemistry

SN - 0003-2700

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