A new fluorescent calix crown ether: Synthesis and complex formation with alkali metal ions

Stoll I, Eberhard J, Brodbeck R, Eisfeld W, Mattay J (2008)
Chemistry. A European Journal 14(4): 1155-1163.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
Abstract / Bemerkung
We synthesised a new N-benzylaza-21-crown-7 ether 5 with a dihydroxy coumarin as a fluorescence sensor and investigated the binding behaviour towards alkali metal cations in methanol by fluorescence titrations. The association constants are within one order of magnitude, with the exception of sodium. Potassium is the preferred binding partner (K-Na = 330M(-1); K-K=8600M(-1); K-Rb,=8200M(-1); K(Cs=)4400M(-1)). The corresponding aza-21-crown-7 ether (6) was attached by a methylene unit to a resorcarene to give fluorescent calix crown ether 12. The binding abilities of the calix crown ether towards alkali metal ions in methanol have also been investigated, and an increasing complex stability, distinct for potassium and rubidium in comparison with 5, was found: K-Na= 440M(-1); K-K=110000M(-1); K-Rb = 63000M(-1); K-Cs=20000M(-1). Like bis(crown ether)s, a cooperative complexation of the crown ether and the cavitand scaffold can be assumed. The proposed complex geometry is supported by Kohn-Sham DFT calculations for the potassium and caesium complexes.
Erscheinungsjahr
Zeitschriftentitel
Chemistry. A European Journal
Band
14
Zeitschriftennummer
4
Seite
1155-1163
ISSN
eISSN
PUB-ID

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Stoll I, Eberhard J, Brodbeck R, Eisfeld W, Mattay J. A new fluorescent calix crown ether: Synthesis and complex formation with alkali metal ions. Chemistry. A European Journal. 2008;14(4):1155-1163.
Stoll, I., Eberhard, J., Brodbeck, R., Eisfeld, W., & Mattay, J. (2008). A new fluorescent calix crown ether: Synthesis and complex formation with alkali metal ions. Chemistry. A European Journal, 14(4), 1155-1163. doi:10.1002/chem.200701018
Stoll, I., Eberhard, J., Brodbeck, R., Eisfeld, W., and Mattay, J. (2008). A new fluorescent calix crown ether: Synthesis and complex formation with alkali metal ions. Chemistry. A European Journal 14, 1155-1163.
Stoll, I., et al., 2008. A new fluorescent calix crown ether: Synthesis and complex formation with alkali metal ions. Chemistry. A European Journal, 14(4), p 1155-1163.
I. Stoll, et al., “A new fluorescent calix crown ether: Synthesis and complex formation with alkali metal ions”, Chemistry. A European Journal, vol. 14, 2008, pp. 1155-1163.
Stoll, I., Eberhard, J., Brodbeck, R., Eisfeld, W., Mattay, J.: A new fluorescent calix crown ether: Synthesis and complex formation with alkali metal ions. Chemistry. A European Journal. 14, 1155-1163 (2008).
Stoll, Ion, Eberhard, Jens, Brodbeck, Ralf, Eisfeld, Wolfgang, and Mattay, Jochen. “A new fluorescent calix crown ether: Synthesis and complex formation with alkali metal ions”. Chemistry. A European Journal 14.4 (2008): 1155-1163.

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