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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 truly small variety of books during this area......

Although this Topics volume doesn't conceal the entire diverse periods fo receptors, it does offer new and well timed views to anion chemistry by means of highlighting a number of parts which were mostly ignored in different experiences. the person chapters are well-written and comprise references from past works as much as the current. As such, this quantity should be of curiosity to the neighborhood of researchers attracted to anions in addition to to those that desire to find out about the host-guest chemistry of anion reputation and its applications.

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Example text

Then, the receptor 12 was synthesized [38]. In the design of this molecule, three structural motifs were used: nonself-complementary binding sites for carboxylate and ammonium, preventing the receptor from internal collapse; an aromatic planar surface for additional selective stacking interaction with the side chain of aromatic amino acids; and a chiral structure for chiral recognition. Despite its ionic structure 12 is almost insoluble in water. The affinity toward amino acids was studied by extraction experiments, where the enantiomers of Phe, Val, and Trp were extracted into CD2Cl2 from aqueous solutions.

The ability of receptor 41 to bind enantioselectively to the chiral substrates has not yet been examined. The preliminary NMR studies performed with this receptor demonstrated the high affinity of 41 to N-Ac-asparagine (K=8,700 M–1) and N-Ac-glutamine (K=55,000 M–1). A very interesting receptor was synthesized by derivatization of a chiral spirobifluorene unit by a urea moiety [71]. The resulting chiral cavity of receptor 42 was capable of binding carboxylates. Using the 1H NMR titration in DMSO, the stability constants of complexes with lactate and mandelate enantiomers were determined.

33 . . . . . . . . . . . . . . 37 4 Guanidinium-Based Receptors . . . . . . . . . . . . . . 39 5 Receptors Based on the Amidic Bond . . . . . . . . . . . . 46 6 Urea- and Thiourea-Based Receptors . . . . . . . . . . . . 49 . . . . . . . . 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.

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


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