Crystalline glycylglycine bolaamphiphile tubules and their pH-sensitive structural transformation

    Authors

    H. Matsui;B. Gologan

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. B

    Keywords

    ORGANIZATION; FIBERS; DNA; Chemistry, Physical

    Abstract

    The assembled structure of the heptane bolaamphiphile, bis(N-alpha-amido-glycylglycine)-1,7-heptane dicarboxylate, displays a sensitivity to the acidity of a solution. At pH 4, the heptane bolaamlihiphile grows to a crystalline tubule in two weeks. At pH 8, a helical ribbon structure is formed in one week. The degree of carboxylic acid protonation was used to control the final assembled structures since the structures are determined by the strengths of the amide-amide and carboxylic acid dimer hydrogen bonds. Direct structural transformation between tubules and helical ribbons was also confirmed as a function of pH using optical microscopy and Raman microscopy. Conversion from the helical ribbons to the tubules occurs within one day, while the reverse conversion, from the tubules to the helical ribbons, is ten times slower.

    Journal Title

    Journal of Physical Chemistry B

    Volume

    104

    Issue/Number

    15

    Publication Date

    1-1-2000

    Document Type

    Letter

    Language

    English

    First Page

    3383

    Last Page

    3386

    WOS Identifier

    WOS:000086655600001

    ISSN

    1089-5647

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