Anion Sensing: -/- by Franz P. Schmidtchen (auth.), Ivan Stibor (eds.)

By Franz P. Schmidtchen (auth.), Ivan Stibor (eds.)

This treatise on anion sensing and popularity represents a brand new addition to a really small variety of books during this area......

Although this Topics volume doesn't disguise all of the varied periods fo receptors, it does supply new and well timed views to anion chemistry by way of highlighting numerous components which have been often neglected in different stories. the person chapters are well-written and contain references from past works as much as the current. As such, this quantity might be of curiosity to the group of researchers drawn to anions in addition to to people who desire to know about the host-guest chemistry of anion attractiveness and its applications.

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The interaction between integer charges. An anion host can only be designed on the exclusive use of Coulomb attractions if the stochastic fluctuation of positive charges around the anionic target in solution is removed and replaced by a permanent field. The basic idea of replacement of the fluctuating ion cloud by covalently linked cationic charges was used early on in the construction of quaternary ammonium cavity hosts 1 and 2, which were shown to bind the halides and a number of oxoanions in aqueous solution [25, 26].

Next to these techniques, UV spectroscopy, fluorescence spectroscopy, and pH titrations are also widely used for this purpose. Despite the relatively large number of enantioselective receptors of cations and neutral species, reports on the effective chiral recognition of anions are still rare. However, there are a number of reports in the literature describing the recognition of carboxylic acids, and amino acids in particular, performed in aqueous solution at a pH where the carboxylic group has to be at least partly ionized.

Zwitterionic cyclodextrins were designed and synthesized by Tabushi a long time ago as artificial receptors for amino acids in water [25]. Only a very low enantioselectivity was detected for Trp. 2) aqueous solution. An enantioselectivity as high as 33 was found for D/L-leucine and the former host [26]. 36 I. Stibor · P. Zlatušková Marchelli used the copper(II) complex of histamine-functionalized b-cyclodextrin for chiral recognition and separation of amino acids [27]. The best results were obtained for aromatic amino acids (Trp).

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