Title

Crystalline glycylglycine bolaamphiphile tubules and their pH-sensitive structural transformation

Authors

Authors

H. Matsui;B. Gologan

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

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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