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

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 the entire diverse sessions fo receptors, it does supply new and well timed views to anion chemistry by means of highlighting numerous parts which were mostly neglected in different studies. the person chapters are well-written and contain references from previous works as much as the current. As such, this quantity can be of curiosity to the group of researchers attracted to anions in addition to to people who desire to find out about the host-guest chemistry of anion popularity and its applications.

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52 . . . . . . . . . . . . . . . 54 . . . . . . . . . . . . . . . . . . . . 61 2 Natural and Modified Natural Receptors 3 Ammonium-Based Receptors 7 Porphyrins and Sapphyrins as Anion Sensing Units 8 Metal-Containing Ligands References Abstract Chiral recognition of anions is still in its infancy. Despite the fact that chiral analytical separation of different species including anions is a well-developed area of research with ample practical applications, the molecular recognition basis of this technique is still underdeveloped.

5). The receptor 39 was able to discriminate between enantiomers of tryptophan (N-Boc-L-Trp K=1,925 M–1; N-Boc-D-Trp K=3,785 M–1). Upon the complexation of naproxen, a moderate enantioselectivity was observed. 50 I. Stibor · P. Zlatušková The bicyclic receptors 40 and 41 were also prepared for enantioselective recognition of chiral carboxylates [69, 70]. The substitution of two benzene rings by pyridines in the receptor 41 enriched this molecule with two additional sites capable of hydrogen bond formation.

Furthermore, when protonated, these compounds are excellent anion binders. In fully protonated polyammonium macrocycles, the coulombic attractions and hydrogen bond formation play a dominant role in the anion complexation. The receptors (R,R)-5 and (S,S,S,S)-6 were designed to bind dicarboxylates [33]. The protonation constants and the binding constants with different chiral carboxylates have been determined by means of pH-metric titrations. 66 kcal/mol, respectively), the strongest binding being observed in both cases with the L-enantiomer.

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