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Issue 29, 2014
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Mixing the spacers in azacryptands: effects on halide recognition

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Abstract

In this work, we report on two new asymmetric dicopper cryptates, characterized by alternate furanyl and p-xylyl spacers. The results of the potentiometric, UV-vis and X-ray diffraction studies are discussed. In particular, for one of the cages in the octaprotonated form, the crystal structure of the complex with nitrate is described. From the point of view of the anion binding in water, the new dicopper cryptates display stronger similarities to each other than to the symmetric analogues (i.e. p-xylyl and furan cryptates). The substitution of even only one spacer modifies the distance between the metal ions. This prevents the development of the CT band, typically accompanying the binding of halides by the furan cryptate, and favors the formation of complexes of different stoichiometry with the linear azide anion, not observed for the symmetric cryptates. The obtained results may be very helpful in the design of new molecular receptors based on dimetallic cryptates, in particular for the tuning of the sensitivity towards specific anionic substrates.

Graphical abstract: Mixing the spacers in azacryptands: effects on halide recognition

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Publication details

The article was received on 25 Mar 2014, accepted on 13 May 2014 and first published on 13 May 2014


Article type: Paper
DOI: 10.1039/C4DT00886C
Citation: Dalton Trans., 2014,43, 11352-11360
  • Open access: Creative Commons BY license
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    Mixing the spacers in azacryptands: effects on halide recognition

    G. Bergamaschi, M. Boiocchi, M. L. Perrone, A. Poggi, I. Viviani and V. Amendola, Dalton Trans., 2014, 43, 11352
    DOI: 10.1039/C4DT00886C

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