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  • Title: A cyclic hexapeptide comprising alternating alpha-aminoxy and alpha-amino acids is a selective chloride ion receptor.
    Author: Yang D, Li X, Sha Y, Wu YD.
    Journal: Chemistry; 2005 May 06; 11(10):3005-9. PubMed ID: 15761910.
    Abstract:
    In nonpolar solvents, the cyclic hexapeptide 2, which comprises alternating D-alpha-amino and D-alpha-aminoxy acids, adopts a C3-symmetric conformation with alternating eight (N--O turns)- and seven (gamma turns)-membered-ring hydrogen bonds. A series of anion-binding studies has suggested that 2 can function as an effective anion receptor that not only displays a high selectivity for chloride ions, but also the capability to extract chloride ions from aqueous solutions into organic phases.
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