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

ISBN-10: 3540232478

ISBN-13: 9783540232476

ISBN-10: 354031461X

ISBN-13: 9783540314615

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 hide the entire diversified sessions fo receptors, it does offer new and well timed views to anion chemistry by way of highlighting numerous parts which were usually missed in different stories. the person chapters are well-written and comprise references from previous works as much as the current. As such, this quantity can be of curiosity to the neighborhood of researchers drawn to anions in addition to to those that desire to know about the host-guest chemistry of anion attractiveness and its applications.

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Extra info for Anion Sensing: -/-

Sample text

Much more efficient and in general also more readily accessible are electroneutral anion hosts that exploit hydrogen bonding as the major binding tool. A rich variety of anion hosts relying on this principle have been reported over the years comprising in many cases amide [35], urea [36] or thiourea [37] functions, but also simple hydroxyl groups or the more exotic pyrrole [38] or imidazolium heterocycles [39] have been utilized. Spectacular success has recently been achieved in sulphate binding in protic solution (water/methanol mixtures) [40].

For the chiral recognition of sodium salts of 2-aminopropionate the imidazolium salt 9 was synthesized [35]. There were four chiral receptors synthesized but only 9 based on (–)-cis-myrtanyl imidazole exhibited the yes–no preliminary complexation of both enantiomers of sodium 2-aminopropionates, being able to complex only the (R)-enantiomer. Chiral Recognition of Anions 39 4 Guanidinium-Based Receptors The guanidinium group is known to remain protonated over a wide range of pH and to form characteristic pairs of well-organized, strong hydrogen bonds to carboxylates and phosphates.

E. 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].

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

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